Question

A yellow leaf cannot prepare food ,why​

Answer 1

Answer:

Because a yellow leaf does not have chlorophyll., which means green colour of the plant by which it absorbs sunlight.

If chlorophyll is not present then the plant cant absorb sunlight.

Answer 2

Answer:

because it does not contain chlorophyll which is necessary for preparing it's own food

Explanation:

chlorophyll is a green pigment which captures sunlight and uses its energy for preparation of its own food .

since a yellow leaf doesn't contain chlorophyll, it is unable to prepare it's own food.