Question

In red-far, red treatment response of plant depends upon

• A. First treatment
• B. Last treatment
• C. Middle treatment
• D. Sum total of all the treatment

Answer 1

The correct option is B Last treatment

When plants are exposed to red and far-red irradiation in sequence, their growth is reversed to a level produced by the last light treatment in sequence and not to the level obtained in darkness. The rate of growth is thus seen to depend on whether red and far-red light is the last treatment provided.

Therefore, the correct answer is option B.