Fact 1: Plants detect and respond to the daily cycle of light and darkness.

Fact 2: Diurnal cycles Diurnal cycles are the daily cycles of light and darkness.

Given the two facts above, answer the question "What detect and respond to diurnal cycles?" with the following options: 
- tides
 - stars
 - fens
 - Oak
 - Conifers
 - humans
 - water
 - plants


 

        plants 