Choose the correct statement(s):

A. According to the first law of thermodynamics, when energy is put to work, a part of it is always converted to non-useful form such as heat, mainly due to friction and radiation.

B. According to the second law of thermodynamics, energy can be transformed from one form to another, but it can neither be created nor destroyed.

1. Both (A) and (B)
2. only (B)
3. only (A)
4. None of these

What is an ecosystem? Name it's two components.

State the law which governs the energy flow in an ecosystem.

Give two examples each of biotic and abiotic components ?