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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

In nature the poinsettia, a plant native to Mexico, blooms only in or around December. This pattern suggests that:

a. the long daily period of darkness (short day) in Decemberstimulates the flowering.

b. vernalization stimulates the flowering.

c. the plant is dormant for the rest of the year.

d. phytochrome is not affecting the poinsettia flowering cycle.

e. a circadian rhythm is in effect.

Summary Introduction

Introduction:

The mechanism that measures the internal time is referred to as biological clocks. These biological clocks tend to adapt to the environmental changes going around. The environmental cues can reset the biological clock in a plant (seasonal and daily adjustments in plants) such as growth, development, and reproduction.

Explanation

Justification/explanation for the correct answer:

Option (a) is given that the long daily period of darkness (short day) in December stimulates the flowering. Photoperiodism is the response of the plant to the period of light they receive. It is quite apparent in the flowering process. Flowering is affected by the day length. There are long day plant that flowers when day length is longer, short-day plant that flowers when day length is shorter, intermediate day plants that flowers when the day length is intermediate, and day-neutral plants whose flowering is not dependent on the length of the day. Poinsettias are the short-day plants and thus, they flower during the December when days are shorter and hence, period of darkness is prolonged. Hence, option (a) is correct.

Explanation for the incorrect answer:

Option (b) is given that vernalization stimulates the flowering. Vernalization is the exposure for a long time in low temperatures...

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