Answers

2015-08-06T18:56:55+05:30
Mostly only old leaves fall due to its stem being waek and not being able to withstand the force
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2015-08-06T21:49:24+05:30
Because of the inertia and 3rd law of motion, leaf gets opposing force(friction) from both the sides if we vigorously shake it. Leaf could withstand the friction force and thus, tend detach from the tree.
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