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Q.1
Choose the minor carp ... [ WB2009]
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a) Cyprinus carpio
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b) Labeo bata
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c) Labeo calbasu
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d) Ctenopharyngodon idella
Explanation
Answer : (b)
Q.2
Haploid plant cultures are got from ,,, [ BHU 2008]
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a) Leaves
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b) Root tip
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c) Pollen grain
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d) Buds
Explanation
Answer : (c)
Q.3
Exotic breed of cattle is ... [ Maipal 2003]
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a) Friesian
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b) Holstein
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c) Jersey
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d) All the above
Explanation
Answer : (d)
Q.4
Isinglass is used for ... [ Har PMT 2007]
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a) Production of insulin
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b) Feeding cattle, Pig and Poultry
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c) Preparation of paints and varnishes
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d) Clarification of vinegar, wines and beer
Explanation
Answer : (d)
Q.5
The main energy containing components of biogas is ... [ MHTCET 2005]
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a) Methane
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b) Hydrogen
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c) Hydrogen sulphide
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d) Carbon dioxide
Explanation
Answer : (a)
Q.6
Cellular totipotency is shown by ... [ CPMT 2009]
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a) Gymnosperm cells
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b) All plant cells
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c) Only bacterial cells
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d) All eukaryotic cells
Explanation
Answer : (b)
Q.7
Callus is ... [ DPMT 1996]
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a) Tissue that forms embryo
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b) Tissue that grows to form embryoid
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c) An insoluble carbohydrate
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d) Unorganized activity dividing mass of cells maintained in culture
Explanation
Answer : (d)
Q.8
Breeding crops for improved nutritional quality is referred to as ... [ kerala 2012]
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a) Biome
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b) Biominase
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c) Bioremediation
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d) Biomagnification
Explanation
Answer : (c)
Q.9
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to ... [NEET 2020]
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a) Plant nematodes
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b) Insect predators
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c) Insect pests
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d) Fungal diseases
Explanation
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to Bollworm. Bolloworm is insect pest. Answer : (c)
Q.10
Fishes in culture fishery in India are .... [ Manipal 2001]
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a) Salomon and Rohu
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b) Rohu and Catla
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c) Catla and Magur
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d) Salmon and Catla
Explanation
Culture fisheries is the cultivation of selected fishes in confined areas with utmost care to get maximum yield. India's breeding and culture technologies include primarily different species of carp, including the important Indian major carp species (notably catla, mrigal and rohu); other species such as catfish, murrel and prawns are recent additions. Answer : (b)
Q.11
By which method was a new breed ‘Hisardale’ of sheep formed by using Bikaneri ewes and Marino rams? [NEET 2020]
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a) Cross breeding
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b) Inbreeding
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c) Out crossing
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d) Mutational breeding
Explanation
Cross-breeding: In this method, superior males of one breed are mated with superior females of another breed. Cross-breeding allows the desirable qualities of two different breeds to be combined. The progeny hybrid animals may themselves be used for commercial production. Many new animal breeds have been developed by this approach. Hisardale is a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Marino rams. Answer : (b)
Q.12
Select the incorrect statement. [ NEET 2019]
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a) Inbreeding increases homozygosity
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b) Inbreeding is essential to evolve purelines in any animal.
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c) Inbreeding selects harmful recessive genes that reduce fertility and productivity
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d) Inbreeding helps in accumulation of superior genes and elimination of undesirable genes
Explanation
Two advantages of inbreeding are: (i) Superior quality of breed of organisms is obtained. (ii) Pure lines can be developed Disadvantages of inbreeding is(i)it increases the risk of disorders caused by recessive genes. (ii) Inbreeding leads to lower production. Answer : (c)
Q.13
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action? [NEET 2020] (a) Darwin’s Finches of Galapagos islands. (b) Herbicide resistant weeds. (c) Drug resistant eukaryotes. (d) Man-created breeds of domesticated animals like dogs.
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a) (b), (c) and (d)
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b) only (d)
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c) only (a)
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d) (a) and (c)
Explanation
Anthropogenic effects, processes, objects, or materials are those that are derived from human activities, as opposed to those occurring in natural environments without human influences. Darwin finches are result of natural selection. Other option are derived from human activities. Answer : (a)
Q.14
Match the columns and identify the correct choice [NEET 2020]
I
II
II
a. Pigeon Pea
i. Root knot
Pseudomonas
b. Brinjal
ii. Ear cockle
Fusarium
c. Sugarcane
iii. Wilt
Anguina
d. Wheat
iv. Red stripe
Meloidogyne
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a) a - iii - 2, b - i - 4, c - iv - 1, d - ii - 3
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b) a - i - 2, b -iii -4, c - ii - 3, d - iv - 1
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c) a - iv - 3, b - i - 2, c - iii - 1, d - ii - 4
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d) a -ii-1, b-iv-3, c-i-2, d-iii-4
Explanation
Root-knot nematodes are plant-parasitic nematodes from the genus Meloidogyne. Vegetable crops (Brinjal) grown in warm climates can experience severe losses from root-knot nematodes, and are often routinely treated with a chemical nematicide. Ear-cockle is caused by the nematode Anguina tritici. Its occurrence has been reported from all major wheat growing regions of the country. Red stipe disease occurs in sugracane. It is caused by Pseudomonas rubrilineans. Fusarium wilt of pigeon pea is both a soil-borne and seed-borne disease in which the infection level of untreated seeds may range from 13% to 19%. Answer : (a)
Q.15
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their .... ..[NEET 2020]
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a) Defence action
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b) Effect on reproduction
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c) Nutritive value
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d) Growth response
Explanation
Nicotine, strychnine and caffeine are alkaloids. These secondary metabolites are produced for defending the plants from herbivores. Answer : (a)
Q.16
Protoplast isolation was first carried out by ... [ WB 2007]
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a) Mendel
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b) Skoog
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c) Bateson
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d) Cocking
Explanation
The first isolation of protoplasts was achieved by Klercker (1892) employing a mechanical method. But the real beginning in protoplast research was made in 1960 by Cocking who used an enzymatic method for the isolation of protoplast. Answer : (d)
Q.17
"Cast nets" are used to catch ... [ MPPMT 2012]
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a) Fresh water fish
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b) Marine fish
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c) Estuary fish
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d) All the above
Explanation
Cast nets are one of the oldest and most efficient ways to catch large amounts of small- to medium-sized fish. They are used to catch all types of fishes. Answer : (d)
Q.18
Aim of plant breeding is to .... [ MPPMT 1998]
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a) Produce improved varieties
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b) Keep soil fertile
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c) Control pollution
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d) To maintain wild plants
Explanation
Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It has been used to improve the quality of nutrition in products for humans and animals. Two Methods of Plant Breeding Selection. Selection is the most ancient and basic procedure in plant breeding. Hybridization. The most frequently employed plant breeding technique is hybridization Answer : (a)
Q.19
A man-made genus produced by a cross between Cabbage and Radish is ... [ BHU 2008]
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a) Bursa pastoris
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b) Lysogenicophyll
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c) Raphanobrassica
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d) Secale
Explanation
Artificial hybridization of radish (Raphanus) and cabbage (Brassica) (both 2N = 18) produces a sterile first-generation hybrid with one diploid chromosome set from either parent. Tetraploidization eventually produces a stable, true-breeding hybrid (Raphanobrassica). (Unfortunately, the hybrid combines the root of a cabbage with the flower head of a radish, rather than the desired reverse!) Answer : (c)
Q.20
Androgenic haploid makes use of cells ... [ AMU 2005]
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a) Anther cells
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b) Callus cells
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c) Megaspore cells
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d) Microspore cells
Explanation
The anther culture is used to produce haploids because anthers contain haploid microspores or pollen grains which can be used to generate new plants. These haploids are called androgenic haploids because they have been developed from male gamete producing spore, i.e., pollen grain or microspore. Answer : (a)
Q.21
Bioenergy is obtained from ... [ MHTCET 2003]
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a) Petroleum
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b) Natural gas
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c) Biomass
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d) Synthetic fuel
Explanation
Bioenergy is one of many diverse resources available to help meet our demand for energy. It is a form of renewable energy that is derived from recently living organic materials known as biomass, which can be used to produce transportation fuels, heat, electricity, and products. Answer : (c)
Q.22
Somatic cell hybrids are produced with the help of ... [ DPMT 2011]
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a) Polypropylene glycol
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b) Polymethylene glycol
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c) Polyhydroxy glycol
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d) polyethylene glycol
Explanation
Somatic fusion, also called protoplast fusion, is a type of genetic modification in plants by which two distinct species of plants are fused together to form a new hybrid plant with the characteristics of both, Most commonly, protoplasts are used and the fusion medium is polyethylene glycol. Somatic cell fusion or Hybrid cells can be produced by fusing different types of somatic cells from two different tissues or species in a cell culture. chemical compound known as polyethylene glycol (PEG) increases the somatic cell fusion by 100 to 1000 times. Answer : (d)
Q.23
Hypophysation is done in major carps ... [ Wardha 2005]
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a) To increase size
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b) To cause breeding in fisheries
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c) To increase their palatability
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d) To increase their growth
Explanation
Hypophysation is a technique whereby ripe fish brooders are stimulated by pituitary hormone introduction to spawn (breed) in captive condition. Injected pituitary gland extract bypasses the brain-pituitary lin , acting directly on the ovaries and testes, providing the surge in blood GtH levels that normally precede spawning (breeding). Answer : (b)
Q.24
To increase lactation/milk yield, cow is given ... [ AIIMS 1997]
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a) Prolactin
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b) Gonadotrophin
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c) Bovine somatotropin
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d) Sorbitol
Explanation
Bovine somatotropin (BST) is a protein hormone produced in the pituitary gland and has been shown to increase the milk yield in lactating cows by preventing mammary cell death in dairy cattle. Answer : (c)
Q.25
Androgenic haploids are used for ,,, [DPMT 1996]
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a) Raising stock for micropropagation
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b) Induction of mutations
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c) Knowing effect of all genes
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d) Preparation of homozygous diploids
Explanation
Haploid production occurs through anther or pollen culture, and they are referred to as androgenic haploids. 2. Gynogenesis: Ovary or ovule culture that results in the production of haploids, known as gynogenic haploids. In androgenesis, the male gametophyte (microspore or immature pollen) produces haploid plant. The basic principle is to stop the development of pollen cell into a gamete (sex cell) and force it to develop into a haploid plant. This process inhibits typical gametophytic differentiation and instead allows cell division and regeneration to occur Thus produces genotype consisting of two identical alleles at a given locus,produce Homozygous dipoles Answer : (d)
Q.26
Biodiesel is got from .. [ Odisha 2006]
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a) Jatropha biloba
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b) Cedrus
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c) Jatropha curcas
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d) None of these
Explanation
Jatropha oil is produced from the seeds of the Jatropha curcas, a plant that can grow in wastelands across India, and the oil is considered to be an excellent source of bio-diesel. Answer : (c)
Q.27
Haploid plants are preferred over diploids for mutation study because in haploids ... [ CBSE 1998]
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a) Recessive mutations express immediately
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b) Culturing is easier
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c) Dominant mutations express immediately
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d) Induction of mutations is easier
Explanation
Haploids are preferred over diploids for mutation study because in haploids recessive mutation is easier. Most of the induced mutations are recessive and these have to be in double to be expressed phenotypically. Answer : (a)
Q.28
The country pioneer in production of fuel alcohol is ... [ AMU 1998]
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a) Saudi Arabia
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b) Japan
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c) Brazil
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d) Iran, Iraq
Explanation
Between 2006 and 2008, Brazil was considered to have the world's first "sustainable" biofuels economy and the biofuel industry leader, a policy model for other countries; and its sugarcane ethanol "the most successful alternative fuel to date." Brazil was until recently the largest producer of alcohol fuel in the world, typically fermenting ethanol from sugarcane Answer : (c)
Q.29
Tissue culture medium is sterilized by .... [ KCET 2007]
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a) Antifungal agents
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b) Keeping at -20°C
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c) Autoclaving at 120°C for 15 minutes
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d) Filtering through fine sieve
Explanation
Plant tissue culture media are generally sterilized by autoclaving at 121 °C and 1.05 kg/cm2 (15-20 psi). The time required for sterilization depends upon the volume of medium in the vessel which generally ranges from 15 minutes to 60 minutes. Answer : (c)
Q.30
Which one is bottom dweller? ..[ MHTCET 2010]
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a) Mrigal
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b) Catla
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c) Lamprey
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d) Dolphina
Explanation
mature Mrigal fish are bottom dwellers Catla is a surface and midwater feeder. Answer : (a)
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