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)

In an aquatic ecosystem, …………… act as producers:

1. small fishes
2. plants
3. krill
4. large fishes

First law of thermodynamics is also known as the law of:

1. conservation of mass
2. conservation of energy
3. conservation of force
4. conservation of momentum