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NEET Practice Questions (MCQs) with Answers & Solutions

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All Physics Chemistry Botany Zoology

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Early seed production in…….. can be done by GAs

A. Pineapple B. Grapes C. Tomatoes D. Conifers

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.2 Gibberellins

Plant Growth And Development

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Gibberellins does not promote bolting in

A. Beet B. Cabbage C. Plants with rosette habit D. Pineapple

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.2 Gibberellins

Plant Growth And Development

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Bolting is

A. Internode elongation just prior to flowering B. Internode elongation just after flowering C. Reduction in stem length just prior to flowering D. Reduction in stem length just after flowering

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.2 Gibberellins

Plant Growth And Development

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Which of the following PGRs have isolated from autoclaved herring sperm DNA?

A. Cytokinins B. Gibberellins C. Auxin D. Ethylene

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.3 Cytokinins

Plant Growth And Development

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Which of the following occurs naturally in plants?

A. Kinetin B. NAA C. IBA D. 2,4 D

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.3 Cytokinins

Plant Growth And Development

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Zeatin

A. Isolated from herring sperm B. Isolated from coconut milk and corn Kernels C. Isolated from corn Kernels D. Isolated from rice seedlings

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.3 Cytokinins

Plant Growth And Development

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Natural Cytokinins are not found in

A. Root apices B. Developing shoot buds C. Young Fruits D. Root hair zone

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Explanation

Page number-249

15.4 Plant Growth Regulators

15.4.3 Physiological Effects of Plant Growth Regulators

15.4.3.3 Cytokinins

Plant Growth And Development

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Cytokinins

Helps to produce new leaves

Helps to produce chloroplasts in leaves

Lateral shoot growth, Adventitious Shoot Formation

All of these

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Explanation

Page number-250

15.4.3.3 Cytokinins

Plant Growth and Development

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Cytokinin

Which of the following is not correct?

A. Help to overcome apical dominance B. They promote nutrient mobilisation and helps in the delay of leaf senescence C. Lateral Shoot Growth D. Formation of Tap root

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Explanation

Page number-250

15.4.3.3 Cytokinins

Plant Growth and Development

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Which of the following hormones is synthesised in large amounts by tissues undergoing senescence and ripening fruits?

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

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Explanation

Page number-250

15.4.3.4 Ethylene

Plant Growth and Development

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