What is the response of various organisms to the duration of light and dark periods called?

  • A
    Phototropism
  • B
    Phototaxis
  • C
    Vernalization
  • D
    Photoperiodism

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What is the effect of temperature and light on plant growth regulators in plants?

Assertion: Photomodulation of flowering is a phytochrome regulated process.
Reason: Active form of phytochrome $(P_{FR})$ directly induces floral induction in shoot buds.

Which of the following pigments absorbs red and far-red light?

Vernalisation can be reversed by

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