CBSE Class 10 Answered

Hi Vijay,

1. Evolution can be defined as the formation of more complex organisms from pre-existing simpler organisms over a certain period.

2. Ten Percent Law states that, ‘Only 10% of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level’.

3. The sequential process of eating and being eaten is called a food chain.

4. A network of interconnecting food chains in a natural community of different organisms is called a food web.