Leaves fall off the branches due to

Options :
  1. abnormal vascular activities
  2. completion of their life duration
  3. formation of abscission layer
  4. external forces


Answer and Explanation :-

Answer: Option 3

Explanation:

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There are a thousand hacking at the branches of evil to one who is striking at the root.
-Henry David Thoreau Walden or Life in the Woods