Plant Growth and Development Question 77
77. The response of different organisms to environmental rhythms of light and darkness is called
[1998]
(a) phototaxis
(b) photoperiodism
(c) phototropism
(d) vernalization.
Show Answer
Answer : b
Hints & Solutions
(b) Photoperiodism is the effect of duration of light and darkness on the growth, development and behaviour of an organism.
