How do autotrophs prepare their food?

Question

(a) How do autotrophs prepare their food? 

(b) In the following food chain, 500J of energy is available to plant. How much energy will be available at I consumer and II consumer levels?

Plant → Sheep → Man

Answer 1

(a) Autotrophs prepare their food (carbohydrate) in presence of sunlight with the help of carbon dioxide and water. This process is called photosynthesis.

(b) According to 10% law, 10 % to 500J that is 50J is transferred to sheep (I consumer). Hence, 5J of energy is transferred to lion (II consumer) that is 10 % of 50 J.