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NEET Biology MCQ
Reproduction In Organisms Mcq
Quiz 7
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Q.1
sexual reproduction takes place by which method in dictyota and fucus?
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a) By Bud method
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b) By Binary fission
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c) By Multiple fission
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d) By Fragmentation
Explanation
During vegetative reproduction Fucus reproduces only by the method of fragmentation. Vegetative reproduction of Dictyota may take place by the decay of the older parts of the thallus, followed by subsequent fragmentation. Answer:(d)
Q.2
ssertion: Ginger is a stem. Reason: Node, bud, adventitious root, scaly leaf are seen on the ginger.
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a) Assertion is true and Reason is false
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b) Assertion is false and Reason is true
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c) Assertion and Reason both are true and Reason is correct explanation of Assertion
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d) Assertion and Reason both are true but Reason is not correct explanation of Assertion
Explanation
Ginger is a rhizome. A rhizome is a modified subterranean plant stem that sends out roots and shoots from its nodes. It bear nodes, internodes and scaly leaves and buds, which gives rise to aerial shoots. The adventitious root arises from the lower surface of nodes. Answer:(c)
Q.3
hich type of reproduction is shown in following figure ?
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a) Fission
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b) Binary fission
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c) Multiple fission
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d) Sporulation
Explanation
The above diagram is of rhizopus. Asexual reproduction in rhizopus occurs through sporulation. Answer:(d)
Q.4
hat is the name of the technique for the production of large number of top?
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a) Top production
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b) Organo genesis
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c) Micro culture
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d) Embryo culture
Explanation
Answer:(b)
Q.5
hat type of fruit will be produced by fixing the stock of sour juice producing branch on scion of plant having sweet branch?
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a) Sweet and fibrous
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b) Sweet and juicy
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c) Sour and juicy
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d) Sour and fibrous
Explanation
In grafting, the upper part (scion) of one plant grows on the root system (rootstock) of another plant. In this process, desirable characters of scion are transferred to stock. Thus, character of scion is expressed in plant product. In some cases of grafting, however, the stock can alter the characteristics of the shoot system that develops from the scion. For example, if the scion of a sweet and fleshy plant is grafted with a stock of sour and plant, then the fruit will be sour and juicy. Answer:(c)
Q.6
hich among the following is an endogenous motile asexual spore?
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a) Zoospores
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b) Aplanospores
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c) Ascospores
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d) Basidiospores
Explanation
A zoospore is a motile asexual spore that uses a flagellum for locomotion. Aplanospores: A nonmotile asexual spore formed by rejuvenescence in certain algae. Ascospores are specific to fungi ascomycetes, and they are produced inside asci. Basidiospores are specific to basidiomycetes, and they are produced in basidia. Ascospores develop endogenously while basidiospores develop exogenously. Answer:(a)
Q.7
ygote undergoes meiosis in:
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a) Algae showing haplontic life cycle
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b) Fungi
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c) Bryophytes
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d) Both A and B
Explanation
The process of meiosis produces unique reproductive cells called gametes, which have half the number of chromosomes as the parent cell. Fertilization, the fusion of haploid gametes from two individuals, restores the diploid condition. Thus, sexually-reproducing organisms alternate between haploid and diploid stages. However, the ways in which reproductive cells are produced and the timing between meiosis and fertilization vary greatly. There are three main categories of sexual life cycles: diploid-dominant, demonstrated by most animals; haploid-dominant, demonstrated by all fungi and some algae; and the alternation of generations, demonstrated by plants and some algae. The haplontic life forms produce the gametes through mitosis. After fertilization a zygote is formed: this cell is the only diploid cell in the entire life cycle. It is thus that same zygotic cell that later undergoes meiosis. A haploid life cycle is found in most fungi and in some green algae like Chlamydomonas Answer:(a,b)
Q.8
egarding a sexually reproducing organism, when their zygote undergoes meiosis, the following conclusions can be made: (i) Life cycle is going to have an embryo before adult stage. (ii) Life cycle doesn’t have an embryo before the adult stage. (iii) The vegetative body of adult is going to be haploid. (iv) The gametes is going to be formed through mitosis. (v) Algae and angiosperms are obeying this pattern.
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a) (i), (ii), (iii) and (iv)
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b) (ii), (iii) and (iv)
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c) (ii) and (iii) only
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d) (iii) and (iv) only
Explanation
In organisms with haplontic life cycle, zygote divides by meiosis to form haploid spores that grow into haploid individuals. Answer:(b)
Q.9
xillary buds are used to raise crops in:
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a) Wheat
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b) Rice
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c) Groundnut
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d) Sugarcane
Explanation
Axillary buds are used to raise crop of sugarcane. Answer:(d)
Q.10
cion is:
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a) Graft of shoot
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b) Graft of root
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c) A bud
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d) Clone
Explanation
Grafting or graftage is a horticultural technique whereby tissues of plants are joined so as to continue their growth together. The upper part of the combined plant is called the scion while the lower part is called the rootstock. Answer:(a)
Q.11
ropagules used to raise
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a) growth
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b) new plants
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c) old plants
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d) all the above
Explanation
In horticulture, a propagule is any plant material used for the purpose of plant propagation. Propagules is a vegetative structure that can become detached from a plant and give rise to a new plant, e.g. a bud, sucker, or spore. Answer:(b)
Q.12
n algae -----is the medium for gamete Transfer.
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a) water
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b) air
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c) tentacles
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d) anther
Explanation
In several simple plants like algae, bryophytes and pteridophytes, water is the medium through which this gamete transfer takes place. Answer:(a)
Q.13
hich one of the following methods is commonly used to maintain the genetic traits of a given plant?
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a) By propagating through seed germination
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b) By propagating through vegetative multiplication
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c) By generating hybrids through intergeneric pollination
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d) By treating the seeds with gamma radiations
Explanation
Genetic trait of a plant can be maintained if the plant is reproduced by asexually or vegetatively. Answer:(b)
Q.14
n which type of reproduction two individual of opposite sex are essential?
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a) Asexual
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b) Sexual
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c) Vegetative
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d) Fragmentation
Explanation
When two parents (opposite sex) participate in the reproductive process and also involve fusion of male and female gametes, it is called sexual reproduction. Answer:(b)
Q.15
n which animal conjugation occurs as a sexual reproduction?
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a) Birds
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b) Hydra
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c) Paramecium
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d) Spirogyra
Explanation
In Paramecium, Conjugation is a form of sexual reproduction. It is a temporary union of two individuals of same species for mutual exchange of genetic materials. Continuous multiplication by binary fission is interrupted by conjugation as it is necessary for the survival and rejuvenation of the race Answer:(c)
Q.16
hich gametes take part in sexual reproduction?
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a) Male gametes
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b) Female gametes
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c) Neutral gametes
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d) Both a and b
Explanation
Sexual reproduction involves formation of the male and female gametes, either by the same individual or by different individuals of the opposite sex. These gametes fuse to form the zygote which develops to form the new organism. Answer:(d)
Q.17
he process of organ formation start of................ .
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a) Due to growth
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b) Due to development
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c) Due to differentiation
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d) Due to division
Explanation
Cell differentiation helps groups of cells to undergo certain modifications to form specialised tissues and organs to form an organism. Answer:(c)
Q.18
hich method is used for vegetative reproduction the development of banana plant?
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a) Cutting
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b) Layering
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c) Grafting
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d) Bud Grafting
Explanation
Banana plant produces either very few seeds or does not produce viable seeds. As a result, sexual reproduction is less likely to occur. Hence, banana plants are propagated through stem cuttings. Answer:(a)
Q.19
ssertion: Gametes are synthesised independently by haploid or diploid parent is Euploid. Reason: Euploid is very common in plant nature.
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a) Assertion is true and Reason is false
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b) Assertion is false and Reason is true
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c) Assertion and Reason both are true and Reason is correct explanation of Assertion
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d) Assertion and Reason both are true but Reason is not correct explanation of Assertion
Explanation
Euploidy is a chromosomal variation that involves the entire set of chromosomes in a cell or an organism. Euploid: The normal number of chromosomes for a species. In humans, the euploid number of chromosomes is 46; with the notable exception of the unfertilized egg and sperm, in which it is 23. Euploidy is more tolerated in plants than in animals. Answer:(b)
Q.20
atch the appropriate pairs.
Column - I
Column - II
(P) Binary fission
(i) Paramecium
(Q) Transverse binary fission
(ii) Euglena
(R) Longitudinal
(iii) Hydra
(S) Budding
(iv) Amoeba
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a) P-i ,Q-ii,R-iii, S-iv
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b) P-iv, Q-i, R-ii, S-iii
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c) P-iv, Q-ii, R-iii, S-i
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d) P-iii, Q-iv,R-i, S-ii
Explanation
Asexual reproduction
Organism
Binary fission
Amoeba
Transverse binary fission
Paramecium
Longitudinal binary fission
Euglena
Budding
Hydra
Answer:(b)
Q.21
dentify A,B and C in the following figure.
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a) A-node,B-bud,C-adventitious root
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b) A-bud,B-node,C-adventitious root
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c) A-adventitious root,B-node,C-bud
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d) A-node,B-adventitious root,C-bud
Explanation
Answer:(a)
Q.22
f vegetative growth of the plant takes place but flower production does not occur-then what could be the reason for this?
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a) Imbalance of hormones
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b) Photoperiod
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c) Imbalance of sugar in water
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d) Irregular transport of solute
Explanation
Photoperiodism is the physiological reaction of organisms to the length of night or a dark period. Photoperiodism affects flowering by inducing the shoot to produce floral buds instead of leaves and lateral buds. Answer:(b)
Q.23
n cryptogamic tracheophytes prothallus, the male gamete and an egg are produced at different time. The reason for this is-
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a) Because they possess higher sterility
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b) They are produced from cells which are meiotically formed
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c) Because they does not allow self-fertilization
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d) Because there is no change in their successful fertilization rate
Explanation
cryptogams or nonseed plants Vascular plants like ferns and horsetails don't have seeds, they reproduce with spores! These plants have two stages - the gametophyte stage and the sporophyte stage. The sporophyte stage is when the fern has fronds with spores on the underside. The spores are released and fall to the ground where they grow into something called a prothallus prothallus, the small, green, heart-shaped structure (gametophyte) of a fern that produces both male and female sex cells (gametes) In gametophyte stage. The prothallus produces a sperm and an egg cell. The sperm fertilizes the egg, and the fertilized egg grows into a new fern Answer:(b)
Q.24
hich tissue is required to be present in between stock and scion during grafting?
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a) Xylem
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b) Phloem
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c)Secondary Meristem
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d) Parenchyma
Explanation
For successful grafting to take place, the vascular cambium tissues of the stock and scion plants must be placed in contact with each other. The vascular cambium is secondary meristems that are formed in stems and roots after the tissues of the primary plant body have differentiated. Answer:(c)
Q.25
ower plant like Chara and Marchantia shows diversity of sexuality such that these plants are respectively:
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a) Monoecious and diclinous
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b) Dioecious and monoclinous
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c) Monoecious and dioecious
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d) Dioecious and monoecious
Explanation
Monoecious plant:Chara. Dioecious plant: Marchantia. Answer:(c)
Q.26
bserve the following organisms; identify the group of organism which require water for gamete transfer: (i) Spirogyra (ii) Gelidium (iii) Riccia (iv) Azolla (v) Cycas (vii) Pepperomia.
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a) (i), (ii) and (v)
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b) (v) and (vi)
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c) (i), (ii), (iii) and (iv)
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d) (i) and (ii) only
Explanation
In several simple plants like algae, bryophytes and pteridophytes, water is the medium through which this gamete transfer takes place. Spirogyra, Gelidium are algae. Azolla is pteridophyte and Riccia is a bryophyte. Answer:(c)
Q.27
nder unfavourable condition, the amoeba withdraws its pseudopodia and secretes a three layered hard covering or cyst around itself. This phenomenon is called as:
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a) Sporulation
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b) Encystation
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c) Fragmentation
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d) Budding
Explanation
Under unfavourable condition the Amoeba withdraws its pseudopodia and secretes a three-layered hard covering or cyst around itself. This phenomenon is termed as encystation. Answer:(b)
Q.28
hich root will form a new plant?
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a) Azadirachta
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b) Dahlia
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c) Ipomoea
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d) Both B and C
Explanation
The vegetative propagation of dahlia is done by tuberous roots. Azadirachta propagates through stem cutting. Ipomoea propagates from stem cuttings from the vines Answer:(b)
Q.29
exual reproduction involves---division
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a) mitotic
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b) meiotic
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c) meiosis at some stages
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d) None of the above
Explanation
meiosis, the reduction division, has to occur if a diploid body has to produce haploid gametes. Meiosis is involved in some stages. Answer:(c)
Q.30
ind the propagules of ginger
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a) Runner
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b) Bulbil
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c) Rhizome
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d) Bulb
Explanation
Propagation Ginger is vegetatively propagated from small sections of the rhizome, called sets. Sets are produced by cutting a small 3–6 cm from a living rhizome. Each piece should possess at least one living bud which will produce shoots. Answer:(c)
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