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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Match the response with its main trigger.

_____ phototropism a. contact with an object
_____ gravitropism b. blue light
_____ thigmotropism c. long period of cold
_____ photoperiodism d. gravity
_____ vernalization e. sun position
_____ heliotropism f. night length

Summary Introduction

To match: The response with its main trigger.

Explanation

Phototropism - b. blue light.

The phenomenon of growth of plants in response to a light stimulus is known as phototropism. In a plant, its root system follows a negative phototropic movement and shoot system follows a positive movement, where the root grows away from the source of light and shoots towards the light.

Gravitotropism - d. gravity.

Gravitotropism is the directional growth of plants in response to gravity. Root system usually grows towards the gravity, whereas shoot system grows against the direction of gravity.

Thigmotropism - a. contact with an object.

Thigmotropism is the directional movement of a plant part that touches stimulus like physical contacts with a solid object. This is a characteristic feature shown by the twining plants and tendrils.

Photoperiodism - f. night length...

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