Biologists say that insects are essential to the survival of the earth’s delicate ecosystem. The insects play important role in __:
1. Carbon cycle
2. Nitrogen Cycle
3. Food cycle
Select the correct option from the codes given below:

Answer: [D] 1, 2 & 3

Most cockroaches feed on decaying organic matter, which traps a lot of nitrogen. The cockroach’s feeding has the effect of releasing  that nitrogen (in their faeces) which then gets into the soil and is used by plants. The earth’s 5,000—10,000 cockroach species are also an important source of food for many birds and small mammals such as mice and rats, and thus an important part of the food cycle.

This question is a part of GKToday's Integrated IAS General Studies Module