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Botany MCQs for NEET — Practice Questions with Answers

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The most widely used compound as source of Ethylene is

A. Ethephon B. Etiope C. Ethyl Methyl carbon D. Epitope

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Explanation

Page number-250

15.4.3.4 Ethylene

Plant Growth and Development

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Ethephon

Which of the following is not correct?

A. In an aqueous solution, it is readily absorbed and transported within the plant and release ethylene slowly B. Hastens fruit ripening in tomatoes and apples C. Accelerates abscission in flowers and fruits D. Promotes male flowers in cucumbers thereby increasing the yield

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Explanation

Page number-250

15.4.3.4 Ethylene

Plant Growth and DevelopmentAnswer- A

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Ethephon

A. Thinning Cotton, Cherry and Walnut B. Promotes female flowers in cucumber C. Hastens the fruit ripening in tomatoes and apples D. All of these

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Explanation

Page number-250

15.4.3.4 Ethylene

Plant Growth and Development

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Abscisic Acid

Which of the following is not correct?

A. Acts as general plant growth inhibitor and an inhibitor of plant metabolism B. Inhibits seed germination C. Stimulates the opening of stomata in the epidermis D. Increases the tolerance of plants to various kinds of stresses

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Explanation

Page number-250

15.4.3.5 Abscisic Acid

Plant Growth and Development

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Which of the following is a stress hormone in plants?

A. ABA B. GA3 C. Cytokinin D. Auxins

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Explanation

Page number-250

15.4.3.5 Abscisic Acid

Plant Growth and Development

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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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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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