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Botany MCQs for NEET — Practice Questions with Answers

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Which of the following statements is correct?

A. All GAs are basic B. All GAs are Acidic C. Most of the GAs are Acidic D. Most of the GAs are basic

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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 is not a Physiological effect of Gibberellins?

A. Increase in the length of the grape stalks B. They cause fruits like Apple to elongate and improve it's shape C. They also delay senescence D. They can shorten the market period for fruits

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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 is a Physiological effect of Gibberellins?

A. GA3 is used to speed up the malting process in brewing industry B. They promote senescence C. They shorten the market period D. Induce parthenocarpy in tomatoes

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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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Spraying sugarcane crop with gibberellins increases the length of the stem and increase the length by

A. 20 tonnes per Km B. 20 tonnes per acre C. 40 tonnes per acre D. 40 tonnes per Km

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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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GAs hastens the maturity period in

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

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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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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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