Why are the numbers of tertiary consumers (apex carnivores) always less than those of other consumers?
Important Questions on Energy Flow in an Ecosystem
What is meant by nitrogen fixation?
Which microbes bring about the process of nitrogen fixation?
Complete the following table (Carefully study the carbon, oxygen and nitrogen cycles).
| Bio-geo-chemical cycles | Biotic processes | Abiotic processes |
| 1. Carbon cycle | ||
| 2. Oxygen cycle | ||
| 3. Nitrogen cycle |
Correct and rewrite the following statements and justify your corrections.
Carnivores occupy the second trophic level in the food chain.
Correct and rewrite the following statements and justify your corrections.
The flow of nutrients in an ecosystem is considered to be a 'one-way' transport.
Correct and rewrite the following statements and justify your corrections.
Plants in an ecosystem are called primary consumers.
Give reasons
Energy flow through an ecosystem is ‘one way’.
Give reasons
Equilibrium is necessary for the various bio-geo-chemical cycles.
