7th Class Science The Living Organisms and their Surrounding Pollution


Category : 7th Class

*     Pollution


There are various polluting elements which are causing pollution in our environment. The most common causes of the land pollution is the dumping of waste materials. Polythene, plastic metals, glass etc. pollute the soil. The use of pesticides is also a major cause of soil pollution. Pesticides are the chemicals used for the protection of crops from harmful bacteria. Pesticides enter in the soil thereby polluting it. Fertilizers are also made from chemicals (acid and alkalis). The excess presence of chemicals in the soil is resulting in soil pollution. Acid rain also cusses the soil pollution. Acid rain occurs due to the air pollution.


Look at the following picture of soil pollution






      Which one of the following is a major cause of soil pollution?

(a) Excess use of fertilizers

(b) Excess use of compost

(c) Excess use of land for crops

(d) All of these

(e) None of these


Answer: (a)



      Mixing of unwanted substances in the air is called?

(a) Soil pollution

(b) Land pollution

(c) Air pollution

(d) All of these

(e) None of these


Answer: (c)

The Earth is the third planet and only one capable of supporting life in the solar system.




The Earth consists of three main layers, crust, mantle, and core.

Weather in the tropical climate is very hot and therefore high humidity is recorded.

Rainfall is measured by an instrument called rain gauge.

The excessive use of fertilizers causes soil pollution..

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