81.
An improved variety of transgenic basmati rice
A
does not require chemical fertilizers and growth hormones
B
gives high yield and is rich in vitamin $$A$$
C
is completely resistant to all insect pests and diseases of paddy
D
gives high yield but has no characteristic aroma
Answer :
gives high yield and is rich in vitamin $$A$$
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82.
In Lederberg's replica experiment what shall be used to obtain streptomycin-resistant strain?
A
minimal medium and streptomycin
B
complete medium and streptomycin
C
only minimal medium
D
only complete medium
Answer :
complete medium and streptomycin
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83.
Commercial lac is produced form
A
The nest of a type of bird
B
The exudation of a type of insent
C
The scale of a type of fish
D
The root of a plant
Answer :
The exudation of a type of insent
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84.
Parthenocarpic tomato fruits can be produced by
A
treating the plants with low concentrations of gibberellic acid and auxins
B
raising the plants from vernalized seeds
C
treating the plants with phenylmercuric acetate
D
removing androecium of flowers before pollen grains are released
Answer :
treating the plants with low concentrations of gibberellic acid and auxins
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85.
A milk preparation is prepared from
A
Grapes
B
Gram
C
Barley
D
Soyabean
Answer :
Soyabean
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86.
The reason why vegetatively reproducing crop plants are best suited for maintaining hybrid vigour is that
A
once a desired hybrid has been produced there are few chances of losing it
B
they have a longer life span
C
they are more resistant to diseases
D
they can be easily propagated
Answer :
once a desired hybrid has been produced there are few chances of losing it
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87.
Outbreeding is an important strategy of animal husbandry because it :
A
is useful in producing purelines of animals
B
is useful in overcoming inbreeding depression
C
exposes harmful recessive genes that are eliminated by selection
D
helps in accumulation of superior genes
Answer :
is useful in overcoming inbreeding depression
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88.
Haploid plant cultures are got from
A
leaves
B
root tip
C
pollen grain
D
buds
Answer :
pollen grain
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89.
Sunflower is mainly cultivated for
A
Protein
B
Starch
C
Oil
D
Alkaloid
Answer :
Oil
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90.
Which of the following statements is incorrect
A
Biofertilizers are used to maintain and improve soil fertility
B
Chemical fertilizers pollute soil and water resources
C
Chemical fertilizers are expensive
D
Most pesticide used these days are specific in nature
Answer :
Most pesticide used these days are specific in nature
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