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Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938

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BuyFindarrow_forward

Biology (MindTap Course List)

11th Edition
Eldra Solomon + 3 others
Publisher: Cengage Learning
ISBN: 9781337392938
Chapter 38, Problem 10TYU
Textbook Problem
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Which signaling molecule triggers the release of volatile substances that attract parasitic wasps to plant-eating caterpillars? (a) phytochrome (b) jasmonic acid (c) auxin (d) methyl salicylate (e) gibberellin

Summary Introduction

Introduction: Plant hormones are chemical molecules produced by plants in extremely low concentration for regulating the growth and development. There are five major hormones involved in the growth process. They are auxin, gibberellin, ethylene, abscisic acid, and cytokinin. Each of these hormones has its own functions at specific locations. The presence of these hormones in a definite amount is very essential for the normal growth and development of the plant.

Explanation of Solution

Reason for the correct answer:

One of the groups of a signaling molecule called Jasmonic acid functions in activating several plant defenses. They affect several plant processes like root growth, pollen development, senescence, and fruit ripening. Jasmonic acid is also responsible for triggering the enzyme production that confers an increased resistance against herbivorous (plant-eating) insects. For example, caterpillar-infested tomato plants release volatile jasmonic acid into the air that functions to attract caterpillar enemies like parasitic wasps. These wasps lay their eggs on the caterpillar’s body. When the eggs hatch, the wasp larvae consume, and finally kill the host insects.

Option (b) is given as “Jasmonic acid”.

Jasmonic acid is responsible for triggering the enzyme production that confers an increased resistance against herbivorous insects.

Hence, the correct answer is option (b).

Reasons for the incorrect answers:

Option (a) is given as, “phytochrome”.

Phytochrome is a blue-green pigment that detects light in plants. It has a wide variety of processes in plants such as the timing of flowering, seed germination, stem growth, and circadian rhythms. Phytochrome is not a signaling molecule that triggers the release of volatile substances that attract parasitic wasps to plant-eating caterpillars...

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