Question

why do leaves fall down from the tree when they turn into yellow ?

Answer 1

The leaves which turn yellow are the leaves in which the plant disposes its waste materials. After the leaf is full of wastes it falls down as it is no longer needed.

Answer 2

The yellow leaves falls down from the tree because there is no chlorophyll in it.A leaf can can prepare its food only while there is chlorophyll present in it.That is why trees shed their when they turn yellow in colour.