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NEET Biology MCQ
Sexual Reproduction In Flowering Plants Mcq
Quiz 6
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Q.1
ion 44 Match the following
a. Place where the pollen grains land
Spore mother cells
b. The site where seeds develop
Stigma
c. Reproductive cells that have exactly the same number of chromosomes as that of parent plant
Microspore mother cells
d. Meiotically dividing cells in the male reproductive tissue that make four microspores
Ovary
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a) a=1 ;b=2 ;c=3 ;d=4
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b) a=2 ;b=4 ;c=1 ;d=3
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c) a=4 ;b=3 ;c=2 ;d=1
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d) a=1 ;b=2 ;c=4 ;d=3
Explanation
Place where the pollen grains land
Stigma
The site where seeds develop
Ovary
Reproductive cells that have exactly the same number of chromosomes as that of parent plant
Spore mother cells
Meiotically dividing cells in the male reproductive tissue that make four microspores
Microspore mother cells
Answer:(b)
Q.2
ion 45 How many mitotic divisions are required for the formation of polygonum type of embryo sac from a functional megaspore?
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a) 2
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b) 1
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c) 4
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d) 3
Explanation
The nucleus of the functional megaspore divides mitotically to form two nuclei which move to the opposite poles, forming the two nucleate embryo sac. Two more sequential mitotic nuclear division results in formation of four nucleate and later eight nucleate stages of embryo sac. Total 3 mitotic cell division occurs. Answer:(d)
Q.3
ion 46 Select the wrong pair:
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a) Wind – Cannabis – Anemophily
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b) Water – Zostera – Hydrophily
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c) Insects – Salvia – Entemophily
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d) Birds – Adansonia – Ornithophily
Explanation
Ornithophilous (brid pollinating) flower are large and strong with abundant nectar and edible part. Example Bombax, agave, Butea, Bignonia. Bats carry out the pollination in Adansonia and kigelia. Answer:(d)
Q.4
ion 47 Which among the following is not a morphological character of anemophilous flowers?
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a) Well exposed stamens and large feathery stigma to easily trap air borne pollen grains
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b) Flowers often have many ovules in the ovary and solitary flowers are common
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c) The pollen grains are light in weight and non – sticky
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d) Flowers or inflorescence are on long stalk
Explanation
Anemophily ( wind pollination) characteristics: (i) Pollens are very light. They may have air sac or wings. (ii) Flowers are small and are colourless, odouless. (iii) Pollen grains are dry. (iv) Anthers have long filament and are abundant. (v) Stigmas are sticky and feathery. Answer:(b)
Q.5
ion 48 The following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.
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a) A - Connective tissue, B - Pollen grains, C – Endothecium
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b) A - Endothecium, B -Connective tissue, C - Pollen grains
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c) A - Pollen grains, B - Connective tissue, C – Endothecium
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d) A - Endothecium, B - Pollen grains, C - Connective tissue
Explanation
Answer:(a)
Q.6
ion 64 Match the following
a. False fruit
Ground nut
b. Parthenocarpic fruit
Barley
c. Albuminous seeds
Black pepper;
d. Non albuminous seeds
Banana
e. Perispermic seeds
Strawberry
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a) a=5 ;b=2 ;c=4 ;d=1 ;e=3
0%
b) a=1 ;b=3 ;c=5 ;d=4 ;e=2
0%
c) a=2 ;b=4 ;c=1 ;d=3 ;e=5
0%
d) a=5 ;b=4 ;c=2 ;d=1 ;e=3
Explanation
False fruit
Strawberry
Parthenocarpic fruit
Banana
Albuminous seeds
Barley
Non albuminous seeds
Groundnut
Perispermic seeds
Black pepper
Answer:(d)
Q.7
ion 49 Which of the following is false? I. Endosperm formation starts prior to first division of zygote II. Angiospermic endosperm is mostly triploid (3n) while gymnospermic one is haploid (n). III. The most common type of endosperm is nuclear. IV. Coconut has both liquid nuclear (multinucleate) and cellular endosperm. V. Milky water of green tender coconut is liquid female gametophyte.
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a) I and II only
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b) III only
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c) V only
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d) II only
Explanation
Formation of the endosperm is initiated by mitotic division of primary endosperm nucleus, which is triploid and is formed by the triple fusion of polar nuclei to secondary nucleus 2n and with the male gamete (n). Endosperm is formed before the division of zygote. Statement (i) is correct. The endosperm of gymnosperms is haploid. It is a pre-fertilization tissue and is equivalent to female gametophyte, hence it is haploid in nature but in angiosperms it is post-fertilization tissue and is generally triploid in nature. Statement (ii) is correct. In coconut there is an outer multicellular solid endosperm and inner free nuclear liquid endosperm in the centre. Satement (iii) is correct. Milky water in young tender coconut is free nuclear liquid endosperm. Statement (v) is incorrect. Answer:(c)
Q.8
ion 50 The first cell of suspensor towards Micropyle which absorbs food material is:
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a) Hypophysis
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b) Haustoria
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c) Radicle
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d) Transverse cell
Explanation
The suspensor undergoes transverse division forming 6-10 celled suspensor. The first cell of suspensor is called haustorium and last cell ( towards embryo cell) is called hypophysis. It forms radical (embryonic root). In botany and mycology, a haustorium (plural haustoria) is a rootlike structure that grows into or around another structure to absorb water or nutrients. Answer:(b)
Q.9
ion 51 What does the filiform apparatus do at the entrance into ovule?
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a) It guides the pollen tube from a synergid into the egg
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b) It helps in the entry of a pollen tube into the synergid
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c) It prevents the entry of more than one pollen tube into the embryo sac
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d) It brings about opening of pollen tube
Explanation
The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding/ helping the pollen tubes into the synergid. Answer:(b)
Q.10
ion 52 Identify the function of perisperm:
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a) Provide nutrients to the germination of seed
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b) Provide nutrients to the development of pericarp
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c) Absorption of water during germination of seed
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d) Both B and C
Explanation
Perisperm is the remnant of nucellus which are persistent. It encloses the embryo and provides nourishment to it in certain seeds. Answer:(a)
Q.11
ion 53 A flower is specially formed for
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a) decoration
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b) photosynthesis
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c) reproduction
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d) fragrance
Explanation
Flowers aid in sexual reproduction. Answer:(c)
Q.12
ion 54 Which layer of the wall of microsporangium is made up of Fibrous layer
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a) Middle layer
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b) Endothecium
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c) Tapetum
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d) Epidermis
Explanation
Second wall layer usually single layered. Cells have a cellulose thickening with a little pectin and lignin. It help in anther dehiscence. The cells of endothecium have fibrous thickenings. Answer:(b)
Q.13
ion 55 A : Megaspore mother cell undergoes mitosis to produce 4 megaspores R : Megaspore mother cell and the megaspores are both haploid
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion
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c) Assertion is true but Reason is false
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d) Both Assertion and Reason are false
Explanation
The process of formation of megaspores from megaspore mother cell is called megasporogenesis. The MMC undergoes meiotic division. Meiosis results in the production of four megaspores. A megaspore mother cell is a diploid cell in which meiosis occurs, resulting in the production of four haploid megaspores. Assertion and reason both are false. Answer:(d)
Q.14
ion 56 In angiosperms, meiosis takes place during the following phase of life cycle:
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a) Sporogenesis
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b) Gametogenesis
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c) Fertilization
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d) Germination of embryo
Explanation
In angiosperms (flowering plants) meiosis takes place in the anthers as well as in the ovary to produce the male gametes (pollen grains) and female gametes (ovules) respectively. Gametogenesis is a biological process by which haploid male and female gametes are formed. In higher plants, there are two stages that are involved- sporogenesis and gametogenesis. Answer:(a)
Q.15
ion 57 The largest cells in the male and female gametophyte of angiosperms are respectively:
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a Central cell and vegetative cell)
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b) Egg cell and generative cell
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c) Vegetative cell and central cell
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d) Generative cell and Central cell
Explanation
Male gametophyte is pollen grain. When the pollen grain is mature it contains two cells, the vegetative cell and generative cell (Figure 2.5b). The vegetative cell is bigger, has abundant food reserve and a large irregularly shaped nucleus. Megaspore mother cell is formed in the nucellus. Megaspore mother cell is diploid and undergoes meiosis to form four haploid megaspores. Central cell is the largest cell of the ovule which is present in the centre of the embryo sac. It contains two polar nuclei which get fused to form a diploid secondary nucleus. Answer:(c)
Q.16
ion 58 Assertion: During microsporogenesis, there is the occurrence of mitosis and meiosis. Reason: During male gametogenesis, there is meiosis only.
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion
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c) Assertion is true but Reason is false
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d) Both Assertion and Reason are false
Explanation
Answer:(c)
Q.17
ion 59 Which of the following produce both cleistogamous and chasmogamous flowers?
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a) Viola
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b) Oxalis
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c) Commelina
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d) All of these
Explanation
Some plants such as Viola (common pansy), Oxalis, and Commelina produce two types of flowers: chasmogamous flowers which are similar to flowers of other species with exposed anthers and stigma, and cleistogamous flowers which do not open at all. Answer:(d)
Q.18
ion 60 How many of the following statements are false: (i) Apomictic embryo are genetically similar to the parents. (ii) In angiosperms, both male and female gametes are non motile. (iii) Bamboo is a perennial monocarpic plant. (iv) Both rotifers and algae are producing offsprings without fertilization.
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a) One
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b) Two
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c) Three
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d) Four
Explanation
Apomixis is the formation of new individuals by asexual methods which mimic sexual reproduction including seed formation but do not involve fusion of gametes or sex cells. Apomixis is controlled by gene and individual; are genetically similar to the parent producing i.e. are clone and members of a clone are called ramets. Statement(i) is true. Bamboo plants are perennial , monocarpic plants . They flower only once in their lifetime , usually after 50-100 years. Statement (iii) is true. In angiosperms, male gamete is motile and female gamete is non-motile. Statement (ii) is false. Answer:(a)
Q.19
ion 61 Which of the following is wrong regarding tapetum?
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a) It nourishes the developing microspores
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b) It secretes callase enzyme for dissolving callose around the pollen tetrad
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c) Its ubish body forms exine of microspores
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d) None of the above
Explanation
Tapetum – This is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells are nutritive. They are multinucleated and polyploidy. In these cells the ubisch bodies which is deposited in the exine of microscope wall.During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains Answer:(d)
Q.20
ion 62 Which statement is true:
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a) The formation of fruit without fertilization is called Parthenocarpy
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b) The membranous coating of radicle in monocot seed is called Coleorhiza
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c) The development of new individual plant without meiosis and gametic fusion is called apomixis
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d) All of the above
Explanation
Parthogenogenesis :It is the development of a new individual from a single gamete without fusion with another gamete. parthenocarpy is the natural or artificially induced production of fruit without fertilisation of ovules, which makes the fruit seedless. The coleorhiza: coleorrhiza or root sheath is a layer of tissue that surrounds the root in the seed and at monocotyledons prevents. It is a protective layer around the rootcap and the root. Apomixis: It is the formation of new individuals by asexual methods which mimic sexual reproduction including seed formation but do not involve fusion of gametes or sex cells. All the above statements are true. Answer:(d)
Q.21
ion 63 Which among the following statements is false?
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a) The cells of the tapetum possess dense cytoplasm and more than one nucleus
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b) In gymnosperms, pteridophytes and angiosperms, the parental body is diploid and produced haploid gametes by meiosis
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c) In haploid organisms, the meiocyte or gamete mother cell undergoes meiosis to form haploid gametes
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d) Egg apparatus is situated in the embryo sac towards the micropylar end
Explanation
Tapetum – This is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells are nutritive. They are multinucleated and polyploidy. A haploid parent produces gametes by mitotic division while diploid parent produces gametes by meiotic division. Option (c) is false. Three cells are grouped together at the micropylar end and constitute the egg apparatus. Answer:(c)
Q.22
on 142 . Which among the following is not a reason for seed dormancy?
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a) Impermeability of seed coat
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b) Immaturity of embryo
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c) Presence of germination inhibitors like Abscisic acid in certain parts of seeds
0%
d) Lack of moisture content in the environment
Explanation
Answer:(b)
Q.23
ion 66 Plants of which one of the following groups of genera are pollinated by the same agency?
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a) Triticum, Cocos, Mangifera
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b) Ficus, Kigelia, Casuarina
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c) Salvia, Morus, Euphorbia
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d) Bombax, Butea, Bauhinia
Explanation
Ornithophily ( Bird pollination)
Bombax, agave, Butea, Bignonia
Chiropterophily ( Pollination by bats)
Adansonia
,
kigelia
,
Bauhinia
Entomophily ( Insect pollination)
Salvia
,
Morus
,
Euphorbia
Answer:(d)
Q.24
ion 67 All of the following statements are correct except:
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a) The proximal end of the filament is attached to the thalamus or the petal of the flower
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b) The anther is a four-sided structure consisting of four microsporangia, two in each lobe
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c) The number and length of stamens are variable in flowers of different species
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d) In a longitudinal section, a typical microsporangium appears near circular in outline
Explanation
The proximal end of the filament is attached to the thalamus or the petal of the flower. The number and length of stamens are variable in flowers of different species. The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe. These statements are correct. In a transverse section, a typical microsporangium appears near circular in outline. option (d) is incorrect. Answer:(d)
Q.25
ion 68 For artificial hybridisation experiment in bisexual flower, which of the sequences is correct?
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a) Bagging → Emasculation → Cross pollination → Rebagging
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b) Emasculation → Bagging → Cross pollination → Rebagging
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c) Cross pollination → Bagging → Emasculation → Rebagging
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d) Self-pollination → Bagging → Emasculation → Rebagging
Explanation
If the female parent bears bisexual flowers, removal of anthers from the flower bud before the anther dehisces using a pair of forceps is necessary. This step is referred to as emasculation. Emasculated flowers have to be covered with a bag of suitable size, generally made up of butter paper, to prevent contamination of its stigma with unwanted pollen. This process is called bagging. When the stigma of bagged flower attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma (cross pollination), and the flowers are rebagged, and the fruits allowed to develop. Answer:(b)
Q.26
ion 69 Diagram given below shows stages in embryogenesis in a typical dicot (Capsella). Identify structures A to D respectively
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a) Suspensor, Radicle, Plumule, Cotyledons
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b) Hypophysis, Radicle, Plumule, Cotyledons
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c) Suspensor, Plumule, Radicle, Cotyledons
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d) Suspensor, Radicle, Plumule, Hypocotyls
Explanation
Answer:(a)
Q.27
ion 70 Which of the following statements is false?
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a) Some 2000 years old viable seeds of Phoenix dactylifera were discovered during archaeological excavation of King Herod's palace near Dead Sea
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b) Record of 10,000 years of dormancy of seeds has been estimated in Lupinus arcticus
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c) The number of seeds in each fruit in case of orchid and some parasitic forms like Orobanche and Striga is one
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d) Many fruits have evolved mechanisms for dispersal of seeds
Explanation
Orchid fruits are one such category and each fruit contain thousands of tiny seeds. Similar is the case in fruits of some parasitic species such as Orobanche and Striga. option (c) is false. Answer:(c)
Q.28
ion 71 . Double fertilization was first discovered by Nawaschin (1898) in:
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a) Lillium and Fritillaria
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b) Mango and sugarcane
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c) Papaya and Pea
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d) Brassica and Candytuft
Explanation
The fusion of one sperm with the egg cell to form the embryo and of the other sperm with the polar fusion nucleus to give rise to the endosperm ('double fertilization') was discovered by Nawaschin in 1898 in the liliaceous plants, Lilium martagon and Fritillaria tenella. Answer:(a)
Q.29
ion 72 A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable reason for the above situation is:
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a) Plant is dioecious and bears only pistillate flowers
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b) Plant is dioecious and bears both staminate and pistillate flowers
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c) Plant is monoecious and bears both staminate and pistillate flowers
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d) Plant is dioecious and bears only staminate flowers
Explanation
Fruits can develop from a single ovary of a single flower(simple fruit) or from several free carpels of a single flower (aggregate) or form whole inflorescence(multiple). In total, fruits develop from ovaries. This is why, a dioecious plant (unisexual) bearing only staminate (male) flowers will not produce fruits, whereas monoecious plants (bisexual) or dioecious plants bearing only pistillate (female) lowers or pistillate and staminate both can bear fruits. So, the correct answer is 'Plant is dioecious and bears only staminate flowers'. Answer:(d)
Q.30
ion 73 How many of the following statements are true: (i) Development of anther in a flower is eusporangiate. (ii) Tapetum contains more than one nucleus due to free nuclear mitosis. (iii) Meroblastic development occurs in embryogenesis. (iv) Isobilateral tetrads are present in monocots.
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a) One
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b) Two
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c) Three
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d) Four
Explanation
isobilateral pollen tetras formed is a characteristic feature of monocot.This statement is true. Tapetum – This is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells are nutritive. They are multinucleated and polyploidy. When the part of zygote is involved in the development of embryo, this type of embryo development is called meroblastic embryogeny. development of microsporangia in anther is from a group of hypodermal cells and is eusporangiate. All the statements are true. Answer:(d)
Q.31
ion 74 Anthesis is a phenomenon which refers to:
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a) Reception of pollen by stigma
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b) Formation of pollen
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c) Development of anther
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d) Opening of flower bud
Explanation
Anthesis is the period during which a flower is fully open and functional. It refers to the opening of the flower bud. Answer:(d)
Q.32
ion 75 How many of the following statements are true: (i) Chalazosperm is nutritive. (ii) Aril is developed from funicle. (iii) Endothelium is the nutritive integument found in all angiosperms. (iv) Horse – shoes shaped embryo sac are found in amphitropous ovule.
0%
a) One
0%
b) Two
0%
c) Three
0%
d) Four
Explanation
When the ovule is curved and embryo sac becomes horse-shoe shaped, such an ovule is called as Amphitropous ovule. Aril develops from the funicle or base of the ovule. It grows from the attachment point of the seed to the ovary. Chalazosperm is perisperm like tissue in chalazal region. It is substitute of endosperm. The inner region of integument may provide nourishment to developing embryo sac and it is called endothelium. This occurs in some plants having unitegmic and tenuinucellate ovules. Statement (iii) is false. Answer:(c)
Q.33
ion 76 Embryo sac contains
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a) 3 eggs
0%
b) 2 eggs
0%
c) 1 egg
0%
d) 4 eggs
Explanation
The embryo sac or female gametophyte is an oval structure present in the ovule of flowering plants. The number of eggs per embryo sac is one. Answer:(c)
Q.34
ion 77 After fertilization seed is developed from
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a) Embryo
0%
b) Embryo sac
0%
c) Ovule
0%
d) Zygote
Explanation
Ripened ovules are known as seeds. Answer:(c)
Q.35
ion 78 The innermost layer of the wall of microsporangium is called
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a) Endothecium
0%
b) Endodermis
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c) Tapetum
0%
d) Intine
Explanation
Tapetum – This is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells are nutritive. Answer:(c)
Q.36
ion 79 Which one of the following is an example of free-nuclear endosperm
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a) Coconut water
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b) Castor
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c) Sugarcane juice
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d) Groundnut
Explanation
In coconut there is an outer multicellular solid endosperm and inner free nuclear liquid endosperm in the centre. Answer:(a)
Q.37
ion 80 A : In apomixis, the plants of new genetic sequence are produced R : In apomixis, two individuals of same genetic meet
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion
0%
c) Assertion is true but Reason is false
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d) Both Assertion and Reason are false
Explanation
It is the formation of new individuals by asexual methods which mimic sexual reproduction including seed formation but do not involve fusion of gametes or sex cells. Reason is false. The organism reproducing through apomixes is called apomicts. Apomixis is controlled by gene and individual; are genetically similar to the parent producing i.e. are clone and members of a clone are called ramets. Assertion is false. Answer:(d)
Q.38
ion 81 In angiosperms, male gametes are formed from;
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a) Vegetative cell by mitosis
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b) Generative cell by mitosis
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c) Vegetative cell by meiosis
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d) Generative cell by meiosis
Explanation
The generative nucleus divides (mitosis) to form two male nuclei, which become surrounded by cytoplasmic masses and appear as distinct male gametes Answer:(b)
Q.39
ion 82 The maturation of Androecium and gynoecium in different times in a bisexual flower is:
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a) Homogamy
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b) Dichogamy
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c) Herkogamy
0%
d) Heterostyly
Explanation
Dichogamy: Anther and stigmas mature at different times. They are of two types: (i) Protandry: Anthers mature earlier. E.g, Salvia, clerodendron, sunflower, rose. (ii) Protogny : Stigmas mature earlier. E.g. plantago, magnolia, mirabilis. Answer:(b)
Q.40
on 143 The diameter of normal pollen grain is:
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a) 25 – 50 micrometer
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b) 60 – 80 micrometer
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c) 10 – 15 micrometer
0%
d) 4 – 6 micrometer
Explanation
Answer:(a)
Q.41
on 252 Pollen tablets and syrups are nutritious and used by:
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a) Horse of races and athletes
0%
b) Pigs and buffalos
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c) Athletes and monkeys
0%
d) None of these
Explanation
Answer:(a)
Q.42
ion 83 Assertion: In angiosperms, endosperm is formed before fertilization and is haploid. Reason: Perisperm and pericarp are the two layers formed inner to seed coat of angiosperms.
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion
0%
c) Assertion is true but Reason is false
0%
d) Both Assertion and Reason are false
Explanation
Endosperm is a nutritive tissue formed from vegetative fertilization. Endosperm is meant for nourishing the embryo. It is generally triploid. Assertion is false Integuments after fertilization forms seed coat. Outer integuments forms Testa, outer seed coat and Inner integuments forms Tegmen, inner seed coat.Reason is false. Answer:(d)
Q.43
ion 84 Asymmetric spindle is formed in:
0%
a) Microspore
0%
b) Megaspore
0%
c) Microsporangium
0%
d) Megasporangium
Explanation
uring microsporogenesis, microsporocytes undergo meiotic division to produce a tetrad of four haploid microspores. The released microspores undergo a highly asymmetric division. Answer:(a)
Q.44
ion 85 Find out the mismatching series: (i) Zostera – Submerged hydrophyte – Filiform pollen. (ii) Versatile anther – Grass – Anemophily. (iii) Viola – Common pansy – Unisexual flowers. (iv) Strawberry – Achene – False fruits.
0%
a) Both (ii) and (iii)
0%
b) Both (ii) and (iv)
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c) Both (i) and (ii)
0%
d) Only (iii)
Explanation
Anemophily ( wind pollination) is seen in grass. Anthers in such flowers are long and are abundant. The peculiar filiform pollen morphology and ability to pollinate in an aquatic medium is seen in the marine angiosperms or seagrasses (Zostera). The “seeds" you see on the outside of a strawberry are actually the plant's ovaries and are called "achenes. Botanists call the strawberry a "false fruit," a pseudocarp. A strawberry is actually a multiple fruit which consists of many tiny individual fruits embedded in a fleshy receptacle. These three are correct. Viola also known as common pansy is a biseual flowers i.e., possess anther as well as stigma. Answer:(d)
Q.45
ion 86 Dioecious condition of a plant:
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a) Allows geitonogamy and Xenogamy
0%
b) Prevents Autogamy but facilitates geitonogamy
0%
c) Increases inbreeding depression
0%
d) Prevents both Autogamy and geitonogamy but allows Xenogamy
Explanation
Dieocious plants have flowers that are only male or only female. This means that one plant produce only female flowers and another plant produce only male flowers. Hence, self pollination is not possible. Self pollination includes autogamy and geitonogamy. Cross-pollination also known as xenogamy is possible. Answer:(d)
Q.46
ion 87 Pollen grains represent the male gametophyte; the former is surrounded by two layers; outer exine and inner intine. Exine is absent in some places of pollen grain of dicot plants. This place represents _________ and it performs _______. Fill in the blanks and choose the correct option:
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a) Pollen kit, attract insects for pollination
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b) Germ pore, initiation of pollen tube
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c) Bicolpate germ pore, supply of nutrients to pollen tube
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d) Monocolpate germ pore, maturation of pollen tube
Explanation
Exine is absent over certain areas called germ pores when circular or it is called germ furrow when elongated. Pollen tube emerges from the germ pores during germination. Answer:(b)
Q.47
ion 88 Double fertilization means:
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a) Fusion of male gamete with antipodal cell
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b) Fusion of male gamete with synergids cell
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c) Fusion of one male gamete with egg cell and another with antipodal cell
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d) Fusion of one male gamete with egg cell and another with secondary nucleus
Explanation
In an embryo sac there occur two sexual fusion – one in syngamy and other in triple fusion. Male gametes fuse with the egg, resulting in the production of diploid zygote. This is called syngamy. The second male gametes fuses with two polar nuclei, producing a triploid primary endosperm nucleus. This is called triple fusion. This phenomenon is called double fertilization. Answer:(d)
Q.48
ion 89 Study the statements and choose the correct option: (i) Tapetum nourish the developing pollen grains. (ii) Hilum represents the junction between ovule and funicle. (iii) In aquatic plants such as water hyacinth and water lily, pollination is by water. (iv) The primary endosperm nucleus is triploid.
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a) (i) and (ii) are correct while (iii) and (iv) are wrong
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b) (ii), (i) and (iv) are correct while (iii) is wrong
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c) (i), (ii) and (iv) are correct while (iii) is wrong
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d) All are correct
Explanation
Tapetum – This is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells are nutritive. The point of attachment of funicle to the ovule is known as hilum. Endosperm is a nutritive tissue formed from vegetative fertilization. Endosperm is meant for nourishing the embryo. It is generally triploid. Not all aquatic plants use water for pollination. In a majority of aquatic plants such as water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by insects or wind as in most of the land plants. Statement (iii) is incorrect/wrong. Rest are all correct. Answer:(d)
Q.49
ion 90 Match the following
a. Banana
Typha
b. Sporopollenin
Attracts pollen tube towards Micropyle of ovule
c. Filiform apparatus
Present in fossilized pollen grains
d. Pollinium
Parthenocarpic fruit
e. Compound pollen grains
Calotropis
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a) a=5 ;b=4 ;c=2 ;d=3 ;e=1
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b) a=3 ;b=2 ;c=4 ;d=5 ;e=1
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c) a=4 ;b=3 ;c=2 ;d=5 ;e=1
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d) a=2 ;b=3 ;c=1 ;d=5 ;e=4
Explanation
Banana
Parthenocarpic fruit
b. Sporopollenin
sporopollenin which is resistant to chemical and biological decomposition.Present in fossilized pollen grains
Filiform apparatus
pollen tube enters the ovule through micropyle and enters synergids through filiform apparatus
d. Pollinium
In calotropis and orchids, the pollen of each anther lobe formed a characteristics mass called pollinium
e. Compound pollen grains
The Pollen grains aggregates as tetrads, diads, polyads and many more. seen in typha
Answer:(c)
Q.50
ion 91 In flowering plants, a mature male gametophyte is derived from a pollen mother cell by:
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a) Three mitotic divisions
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b) One meiotic and two mitotic divisions
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c) Two meiotic divisions
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d) A single meiotic division
Explanation
The PMCs divide meiotically each forming generally tetrahedral tetrads. Size of nucleus in pollen grain increases and it divides mitotically to produce a bigger vegetative cell or tube cell and smaller generative cell. Further another mitiotic division occurs which dicides generative cell in 2 male gametes. Answer:(b)
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