Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesize chlorophyll ?

Question

Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesize chlorophyll ? (A) After being given a pulse of blue light (B) After being given a pulse of red light (C) After being given a pulse of red light followed by a pulse of far-red light (D) After being given a pulse of far-red light followed by a pulse of red light

Tardigrade Admin · Accepted Answer

The pulse of red light converts Pr to Pfr. Subsequent pulses of far-red light stimulate changes that lead to chlorophyll synthesis.

Q. Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesize chlorophyll ?

After being given a pulse of blue light

After being given a pulse of red light

After being given a pulse of red light followed by a pulse of far-red light

After being given a pulse of far-red light followed by a pulse of red light

The pulse of red light converts $P_{r}$ to $P_{f r}$ . Subsequent pulses of far-red light stimulate changes that lead to chlorophyll synthesis.

Q. Etiolated seedlings are produced by germinating seeds and keeping them in total darkness. Under which of the following conditions will plants kept in the dark-begin to synthesize chlorophyll ?

After being given a pulse of blue light

After being given a pulse of red light

After being given a pulse of red light followed by a pulse of far-red light

After being given a pulse of far-red light followed by a pulse of red light

The pulse of red light converts Pr​ to Pfr​. Subsequent pulses of far-red light stimulate changes that lead to chlorophyll synthesis.

The pulse of red light converts $P_{r}$ to $P_{f r}$ . Subsequent pulses of far-red light stimulate changes that lead to chlorophyll synthesis.