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Zoology MCQs for NEET — Practice Questions with Answers

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Insect resistance in host crop plants may be due to

A. Morphological B. Biochemical C. Physiological D. All of these

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Explanation

NCERT page number -175

9.2.3 Plant Breeding for Developing Resistance to Insect Pests

Strategies For Enhancement In Food Production

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Hairy leaves in several plants are not associated with resistance to insect pests in

A. Resistance to jassids in cotton B. Cereal leaf beetle in wheat C. Resistance to aphids in brassica D. Both B and C

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Explanation

NCERT page number -175

9.2.3 Plant Breeding for Developing Resistance to Insect Pests

Strategies For Enhancement In Food Production

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In wheat, solid stem lead to

A. Non preference by the stem sawfly B. Preference by the stem sawfly C. Non preference by the bollworms D. Preference by the bollworms

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Explanation

NCERT page number -175

9.2.3 Plant Breeding for Developing Resistance to Insect Pests

Strategies For Enhancement In Food Production

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Smooth leaved and nectar-less cotton varieties

A. Attract bollworms B. Do not attract bollworms C. Attract aphids D. Do not attract aphids

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Explanation

NCERT page number -175

9.2.3 Plant Breeding for Developing Resistance to Insect Pests

Strategies For Enhancement In Food Production

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Biofortification- is the most practical means to improve public health

A. Breeding crops with higher levels of vitamins and minerals B. Breeding crops with higher proteins C. Breeding crops with healthier Fats D. All of these

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Explanation

NCERT page number -176

9.2.4 Plant Breeding for Improved Food Quality

Strategies For Enhancement In Food Production

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In 2000, maize hybrids that had

A. Twice the amino acids lysine and tryptophan than existing maize hybrids were developed B. Thrice the amino acids lysine and tryptophan than existing maize hybrids were developed C. Half the amino acids glutamate and tryptophan than existing maize hybrids were developed D. Twice the amino acids glutamate and tryptophan than existing maize hybrids were developed

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Explanation

NCERT page number -176

9.2.4 Plant Breeding for Improved Food Quality

Strategies For Enhancement In Food Production

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Commonly consumed rice varieties has ……. Iron content of Iron fortified rice variety.

A. Twice B. Thrice C. One fifth D. One third

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Explanation

NCERT page number -176

9.2.4 Plant Breeding for Improved Food Quality

Strategies For Enhancement In Food Production

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Homeostasis is

tendency to change with change in environment

tendency to resist change

disturbance in regulatory control

plants and animals extracts used in homeopathy

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Explanation

(b) Homeostasis Ghomes similar, (Gr. homeos = similar, stasis-standing) is the tendency of maintaining a relatively stable internal physiological environment in an organism, or steady-state equilibum in a population or ecosystem. It is carried out by regulatory mechanisms which coordinate internal fuctions such as providing nutrients to cells and transporting substances.

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Many freshwater animals cannot live for long in sea water and vice versa because of:

Buoyancy related problems

Lack of impermeable skins

Thermolabile enzymes

Osmotic considerations

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Explanation

4. Read page 222, XII NCERT

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When exposed to cold temperatures, which of the following is responsible for maintaining constant body temperature in humans?

Vasoconstriction and shivering

Vasodilation and shivering

Vasodilation and sweating

Vasoconstriction and sweating

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Explanation

1. Read page 224, XII NCERT

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