Q: What detect and respond to diurnal cycles?
Options:
- (A) tides
- (B) stars
- (C) fens
- (D) Oak
- (E) Conifers
- (F) humans
- (G) water
- (H) plants
Let's think step by step below.

user
Plants detect and respond to the daily cycle of light and darkness. Diurnal cycles Diurnal cycles are the daily cycles of light and darkness. Plants detect and respond to diurnal cycles.
Thus, the answer is (H).
assistant