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

(a) the excessive cutting down of forest plants and trees

(b) the excessive killing of large herbivores

(c) the excessive killing of large carnivores

(d) the excessive use of poisonous chemicals called herbicides

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Solution

(c) the excessive killing of large carnivores

The excessive killing of lions resulted in an increase in the number of herbivores, which in turn consumed all the vegetation. Hence, the Sahara Desert was formed.

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Q. Excessive use of chemicals in cultivation can be poisonous to plants.

Excessive use of chemicals in agriculture can be poisonous.

The excessive use of one of the following in agriculture can cause the death of fish in a pond by oxygen starvation. This one is:

(a) fertilisers

(b) manures

(d) herbicides

Excessive use of chemicals in agriculture creates problems since they can be poisonous to many plant and animal species and cause environmental pollution.

Q. The cutting down of trees and forests by humans on a large scale is called deforestation.

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(c) the excessive killing of large carnivores The excessive killing of lions resulted in an increase in the number of herbivores, which in turn consumed all the vegetation. Hence, the Sahara Desert was formed.

(c) the excessive killing of large carnivores

The excessive killing of lions resulted in an increase in the number of herbivores, which in turn consumed all the vegetation. Hence, the Sahara Desert was formed.