$P_{r}$ stste of phytochrome absorbs light wavelength of

660 n m

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640 n m

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620 n m

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720 n m

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Solution

The correct option is A $660 n m$
Phytochrome regulates phytochrome responses of plants which include photoperiodic induction of flowering and also the development of chloroplast development, leaf senescence, leaf abscission. The action spectrum required for these responses shows peaks at 660 nm at red.

Therefore the right option is option A.

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Pr stste of phytochrome absorbs light wavelength of

$P_{r}$ stste of phytochrome absorbs light wavelength of