Q71 of 163 Page 228

One of the following helps in the recycling of materials in an ecosystem. This one is:

Saprotrophs (decomposers) derives nutrition from dead and decaying organic matter and thus recycles material in an ecosystem.

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69

One of the following is a micro-consumer. This one is:

 70

Which of the following act as decomposers in an ecosystem?

 72

In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is:

 73

Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man: