You are presented with the question "What detect and respond to diurnal cycles?" and the following answer choices: 
- tides
 - stars
 - fens
 - Oak
 - Conifers
 - humans
 - water
 - plants

Now knowing that plants detect and respond to the daily cycle of light and darkness and diurnal cycles Diurnal cycles are the daily cycles of light and darkness, choose the best answer.


 

        plants 