$15 \%$ can be taken as the average value for the amount of organic matter that is present at each step and reaches the next level of consumers.

Choose one consumer each that belongs to the second and third trophic levels from the organisms given below:
Eagle,frog,tiger,rabbit,fox

What is the role of decomposers in an ecosystem?

What is meant by 'non-biodegradable' waste? Identify biodegradable waste from the following:
Empty packet of chips,empty plastic bottle of mineral water,empty paper box of sweets,empty tin of a cold drink.

Give one protective function of forests.

Pesticides like $DDT$ which are sprayed to kill pests on crops are found to be present in the soil,groundwater,water bodies etc. Explain how do they reach these places.