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

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

Food chain begins with :

1. respiration
2. photosynthesis
3. decomposition
4. decay

Energy enters in a food chain through:

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

The place of human being in food chain in an ecosystem is as:

1. producer
2. consumer
3. decomposer
4. both (a) & (b)