Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
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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.
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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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Students have asked these similar questions
Gaseous hormones are able to enter cells without requiring specialmembrane transporter. Which of the major plant hormones is adiffusible gas?a. auxin b. gibberellin c. cytokinin d. ethylene e. abscisic acid
1) You exposed a plant to a light that shines on the right side of a plant. Choose the statement that best describes the plant growth towards the light.    A. Light destroys auxin, and thus the shaded side grows faster.   B. Auxin moves from the lighted side to the shaded side where it stimulates growth.   C. Auxin moves from the shaded side to the lighted where it stimulates growth.   D. Auxin moves from the shaded side to the lighted side where it inhibits growth.     2)Select a plant hormone that responsible in inhibiting protein breakdown and stimulating RNA synthesis.      A. Abscisic acid   B. Ethylene   C. Cytokinins   D. Auxins    3)Select the following organs that produces pollen grains.    A. Anther   B. Style   C. Filament   D. Ovule     4)Identify the best description of oviparity.    A. Organism that gives birth to offsprings.   B. Organism that forms the…
This plant hormone is a hydrocarbon gaseous hormone, which is best known for its role in fruit ripening. A. Auxin B. Gibberellins O C. Strigolactone D. Abscisic acid O E. Ethylene
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