Question

A stack of chlorophyll in disc form inside a leaf

Answer 1

chlorophyll helps the leaf to keep fresh so chlorophyll needed for also make food from the sunlight so chlorophyll needed in leaves if chlorophyll is not there in the leaves the leaves may turn yellowish did you know ? why sometime we apply Vaseline on leaf because chlorophyll absorb it and makes it moisture
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Answer 2

The disc like structure is called Thylakoids. In plants photosynthesis take place inside the chloroplast. It is surrounded by a 'double membrane' found in mitochondrion.

Explanation:

In Chloroplast there is a 'third membrane' which forms a stacked disc-shaped structure called thylakoids. Thylakoids contains chlorophyll which helps in the beginning of photosynthesis.

Photosynthesis is a process by which plants make their food. They take water, sunlight and carbon dioxide as the source and produces 'glucose and oxygen'. They exchange water, carbon dioxide and oxygen with the help of tiny pores known as stomata.