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What will be the effect on phytochrome in a plant subjected to continuous red light?

1. Level of phytochrome decreases
2. Phytochrome is destroyed
3. Phytochrome synthesis decreases
4. Destruction and synthesis of phytochrome are in equilibrium

Correct answer: Destruction and synthesis of phytochrome are in equilibrium

Solution

Under continuous red light, phytochrome is repeatedly photoconverted rather than simply accumulating or disappearing. The system reaches a dynamic equilibrium where destruction and synthesis balance each other, so the overall level stays steady.

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