Question

Name the two substances which combine in green leaf in the presence of sunlight to make food

Answer 1

Green plants synthesise their foodthemselves by the process of photosynthesis. They are autotrophs. Plants use simple chemicalsubstances like carbon dioxide, water and minerals for the synthesis of food. Chlorophyll and sunlight are the essential requirements for photosynthesis.

Answer 2

there are four substances which are necessary tomake food in plants 
1  chlorophyll
2  sunlight
3  water
4  oxugen