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

Fact 2: During the flowering cycle they receive fewer hours of light.

Given the two facts above, answer the question "Plants detect and respond to the what such as during the flowering when hours are fewer" with the following options: 
- daily cycles
 - nitrogen cycle
 - temperature
 - daylight changes
 - flood cycle
 - Chemical energy
 - movement
 - meal times


 

 daily cycles        