What is true about phytochrome?

P_{r}

absorbs red light and becomes

P_{f r}

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P_{r}

absorbs yellow light and becomes

P_{f r}

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P_{f r}

absorbs yellow light and becomes

P_{r}

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P_{f r}

absorbs red light and becomes

P_{r}

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Solution

The correct option is C $P_{r}$ absorbs red light and becomes $P_{f r}$
Phytochrome is a pigment found in plants which is involved in various plant processes like seed germination. Seed germination requires sufficient amount of P $_{p r}$ . P $_{r}$ is synthesized by germinating seeds and is converted to P $_{p r}$ when exposed to red light. However, when seeds are exposed to far-red light, they will not germinate as P $_{p r}$ is converted to P $_{r}$ .
Thus, the correct answer is option A.

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