CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
CAMPBELL BIOLOGY IN FOCUS-MOD.MASTERING
3rd Edition
ISBN: 9780135191811
Author: Urry
Publisher: PEARSON
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Chapter 31, Problem 1TYU

The hormone that helps plants respond to drought is

  1. A.    auxin.
  2. B.     abscisic acid.
  3. C.     cytokinin.
  4. D.    ethylene.
Expert Solution & Answer
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Summary Introduction

Introduction:

A drought is known as environmental stress to plants and is caused because of the scarcity of water. It significantly affects or damages the growth of plants.

Answer to Problem 1TYU

Correct answer:

The abscisic acid hormone helps the plants to respond to drought conditions. Therefore, option (B) is correct.

Explanation of Solution

Reason for the correct statement:

In the condition of drought, plants inhibit or avoid the germination of seeds and growth. Plants undergo dormancy state, in which plants exhibit a very little or no growth. In this condition, the abscisic acid (a hormone) helps the plants to respond against drought.

Option (B) is given as “abscisic acid”.

“The hormone that helps the plants to respond to drought is abscisic acid”, it is the right answer.

Hence, option (B) is correct.

Reasons for the incorrect statements:

Option (A) is given as “auxin”.

Auxins (plant hormones) are plant regulators, which promote the elongation of the stem, development of fruit, and the formation of lateral and adventitious roots. Hence, it is the wrong answer.

Option (C) is given as “cytokinin”.

Cytokinin is the regulator that helps in promoting the lateral bud growth, delaying the senescence of leaf, and stimulation of the germination of seeds. Hence, it is the wrong answer.

Option (D) is given as “ethylene”.

Ethylene is a plant hormone that is gaseous and is stimulated by auxins. It promotes the ripening of fruits and flowering. Hence, it is the wrong answer.

Hence, options (A), (C), and (D) are incorrect.

Conclusion

The hormone that helps plants to respond to drought is abscisic acid.

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