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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
In some plants, flowering is a ________ response.
- a. phototropic
- b. gravitropic
- c. photoperiodic
- d. thigmotropic
Concept introduction: The term photoperiodism is usually used to describe the ability of a plant to flower in response to the changes in its photoperiod. Plants that flower only when the day length is less than a threshold are called short-day plants and those flower only when the day length crosses a certain threshold are called long-day plants. There are certain other groups that flowering does not depend on the day length are known as day–neutral plants.
Reason for the correct answer: There are some plants that require a definite day or night length in order to undergo flowering. Based on the requirement of the day length, it has been classified into long-day plants, short-day plants, and day-neutral plants. Flowering would not occur if the plants are not exposed to their definite photoperiod.
Option c. is given as “photoperiodic”. Since in many plants flowering is a photoperiodic response, option c. is the correct answer.
Reason for the incorrect answer:
Option a. is given as “phototropic”...
Chapter 30 Solutions
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