Out of the following components, which one is not abiotic ?

1. trees
2. light
3. heat
4. rain

Plants use …………… of the total energy absorbed by them in photosynthesis for producing their food.

1. 40%
2. 50%
3. 5%
4. 0.02%

The source of energy in an ecosystem is :

1. sun
2. decayed bodies
3. green plants
4. sugar

Energy enters in a food chain through:

1. primary consumers
2. secondary consumers
3. tertiary consumers
4. producers