The response of different organisms to environ-
mental rhythms of light and darkness is called
(a) phototaxis (b) photoperiodism
(c) phototropism (d) vernalization
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Answer:
phototropism is the answer in the case of plants
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The correct option is option b) photoperiodism.
Explanation:
- Photoperiodsim can be defined as the changes that plants and animals undergo due to the difference in the length of the night or the dark period.
- It is most commonly observed in plants, and plants are also categorized into three categories according to the time of these difference between light and dark periods.
- They are long- day plants, short - day plants, and day neutral plants.
- In animals too, photoperiodism induce various physiological changes including their breeding habits.
- They also induce changes in animal behaviours and can lead to migrations, or hibernation in the animals.
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