EVS Read/observe And give the Solution.

Organic manure is added to the soil. Organic manure is prepared by mixing remains of plants, vegetables, fruits etc. with soil and is allowed to decompose by microorganisms. Microorganisms convert the above substances to organic manure which helps plants to grow.

Mosquitoes larvae grow in water. Hence to prevent them from growing we should not allow water to accumulate. We should keep our surroundings dry. Also fishes like guppies, gold fish and killifish eat up the mosquto larvae. Hence sometimes these fish are grown in ponds to prevent mosquitoes.

Some plants like neem or their extract repel insects. That is insects run away from these substances. Hence if we place dried leaves of neem. The grains will be freed from the insects as they will go away. Similarly it is by applying canola oil to the grains we can remove the insects as canola oil is also an insect repellent.

(A) There are two food chains as shown below :

(B) There are two food chains as shown below: