What will be the effect on phytochrome in a plant subjected to continuous red light?
Correct answer: D. First (b) then (a)
- A. Phytochrome synthesis will increase
- B. Level of phytochrome will decrease
- C. Phytochrome will be destroyed
- D. First (b) then (a)
Explanation
d) : When continous red light is given the level of P R decreases as most of it is converted to P FR form. When the concentration ofP R reaches below a critical value, it starts synthesis of more phytochromes in the P R form so that there is an equilibrium betweem synthesis and destruction of P R form.
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