1.

What substances in the soil are useful for the growth of plants?

Answer»

The plants use substances like water, minerals and organic matter from the soil for their growth. Note: Grasshopper does not feed on worms. It is not a flesh eating insect. It eats only various parts of plants like seeds & leaves. The first image shown in the textbook on page 20 is of an insect called cricket, which feeds on worms, and the bird feeds on this cricket.

Hence the correct food chain is 

grass → worm → cricket (insect) → bird



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