Answers

The Brainliest Answer!
2014-07-13T12:24:43+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
This phenomena Generally occurs before winters,
when the amount of sunlight received by plants and the leaves reduces.
hence, the process of photosynthesis does not take place in a adequate amount to provide food to all the leaves, hence they turn yellow and fall off gradually thus providing the plant with sufficient amount of food to survive. 
1 5 1