(A) The transition from the vegetative phase to the reproductive phase in many plants is primarily regulated by the duration of light and dark periods

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(A) The transition from the vegetative phase to the reproductive phase in many plants is primarily regulated by the duration of light and dark periods,a phenomenon known as photoperiodism. Plants perceive the length of the day (photoperiod) to initiate flowering. Therefore,the correct answer is the length of the day.

Class 11 Biology Plant Growth and Development Photoperiodism and Vernalization

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In many plants,the changeover from the vegetative to the reproductive phase takes place in response to:

A
The length of the day
B
The severity of temperature
C
Mainly the food material available in the soil
D
Oxygen present in the air

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Plant Growth and Development

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Photoperiodism and Vernalization

Phytochrome is sensitive to

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Most of the plants are seasonal due to

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Phytochrome occurs in two forms. In which form does it promote the germination of seeds of some species?

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Vernalisation is done at

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Assertion: Dark period plays a more important part in flowering than the light period.
Reason: Flowering occurs in short-day plants if the dark period is interrupted by a light break.

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In many plants,the changeover from the vegetative to the reproductive phase takes place in response to:

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Phytochrome is sensitive to

Most of the plants are seasonal due to

Phytochrome occurs in two forms. In which form does it promote the germination of seeds of some species?

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Assertion: Dark period plays a more important part in flowering than the light period.Reason: Flowering occurs in short-day plants if the dark period is interrupted by a light break.

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Assertion: Dark period plays a more important part in flowering than the light period.
Reason: Flowering occurs in short-day plants if the dark period is interrupted by a light break.