Question

2. Why do plants use nitrogen present in the soil? How is this nitrogen replenished in the soil?
3. Explain how green plants prepare their own food.
4. How can you show that sunlight is necessary for photosynthesis?​

Answer 1

Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins.