CBSE Class 10 Science Chapter 6 Life Processes

1. Autotrophic Nutrition.
2. Heterotrophic Nutrition.

1. Sunlight
2. Chlorophyll: Sunlight absorbed by chloroplast
3. CO2: Enters through stomata, and oxygen (O2) is released as a byproduct through stomata on the leaf.
4. Water: Water + dissolved minerals like nitrogen, phosphorous etc., are taken up by the roots from the soil.

1. Water comes from the soil, through the xylem tissue in roots and stems.
2. Carbon dioxide comes in the leaves through stomata.

1. Absorption of light energy by chlorophyll.
2. Conversion of light energy into chemical energy + splitting (breaking) of water into hydrogen and oxygen.
3. Reduction of CO2 to carbohydrates.
4. Sunlight activates chlorophyll, which leads to splitting of the water molecule.
5. The hydrogen, released by the splitting of a water molecule is utilized for the reduction of carbon dioxide to produce carbohydrates.
6. Oxygen is the by-product of photosynthesis.
7. Carbohydrate is subsequently converted into starch and is stored in leaves and other storage parts.
8. The splitting of water molecules is a part of the light reaction.