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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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ABA plays an important role in except

A. Seed development B. Maturation and dormancy C. Helps seeds to withstand desiccation and other factors unfavorable for growth D. Antagonist to Cytokinin

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Explanation

Page number-250

15.4.3.5 Abscisic Acid

Plant Growth and Development

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More than one PGR are not involved in which of the following physiological effect?

A. Dormancy in seeds or buds B. Abscission, Apical Dominance C. Senescence D. Fruit Ripening

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Explanation

Page number-251

15.4.3.5 Abscisic Acid

Plant Growth and Development

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Which of the following statements is not correct?

A. PGR is of only one kind of intrinsic control B. Only under genomic control, these PGRs play an important role in plant growth and development C. Many of the extrinsic factors such as temperature and light control plant growth and development via PGR D. Vernalization, Flowering, dormancy, seed germination and plant movements are under the control of extrinsic factors along with intrinsic factors

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Explanation

Page number-251

15.4.3.5 Abscisic Acid

Plant Growth and Development

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For the induction of flowering, some plants require a

A. Periodic exposure to light B. Continuous exposure to light C. No exposure to light D. No exposure to night

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Explanation

Page number-251

15.5 Photoperiodism

Plant Growth and Development

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If a plant needs exposure of light more than a defined period for flowering, such plant is called

A. Long day plants B. Short day plants C. Day neutral plants D. Red light plants

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Explanation

Page number-251

15.5 Photoperiodism

Plant Growth and Development

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If a plant needs exposure of light less than a defined period for flowering, such plant is called

A. Long day plants B. Short day plants C. Day neutral plants D. Far red light plants

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Explanation

Page number-251

15.5 Photoperiodism

Plant Growth and Development

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When there is no such relation between exposure to light duration and induction of flowering response such plants are called

A. Long day plants B. Short day plants C. Day neutral plants D. Far red light plants

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Explanation

Page number-251

15.5 Photoperiodism

Plant Growth and Development

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Which of the following is not true for flowering?

A. Only duration of dark period is important B. Certain plants depend not only on a combination of light and dark exposures but also their relative durations C. The site of perception for light or dark duration are the leaves D. There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.

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Explanation

Page number-252

15.5 Photoperiodism

Plant Growth and Development

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Flowering can be affected in certain plants

A. by quantitative exposure to low temperature B. by qualitative exposure to low temperature C. Both A and B D. It does not depend on low temperature exposure

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Explanation

Page number-252

15.6 Vernalization

Plant Growth and Development

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Vernalisation prevents

A. Precocious reproductive development late in growing season B. Late reproductive development C. Flowering D. Fruiting

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Explanation

Page number-252

15.6 Vernalisation

Plant Growth and Development

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