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1.	(I) Write about hydrosphere (or) Why Earth is called as Blue planet? (II) Even though the use of pesticides increases the crop production, they adversely affect the living organisms. Explain the function and the adverse effects of the pesticides
Answer» (I) 1. Hydrosphere include all types of water sources like oceans, seas, rivers, lakes, streams, underground water, polar ice – caps, clouds etc. 2. It covers about 75% of the earth’s surface. Hence earth is called as Blue planet: (II) Pesticides are the chemicals that are used to kill or stop the growth of unwanted organims. But these pesticides can affect the health of human beings. Pesticides are classified as 1. Insecticides 2. Fungicides and 3. Herbicides. 1. Insecticides: Insecticides like DDT, BHC, Aldrin can stay in soil for a long period of time and are absorbed by soil. They contaminate root crops like carrot, radish.. 2. Fungicides: Organomercury compounds dissociate in soil to produce mercury which is highly toxic. 3. Herbicides: They are used to control unwanted plants and are also known as weed killers. Eg, Sodium chlorate, sodium nitrate. They are toxic to mammals.

(I) Write about hydrosphere (or) Why Earth is called as Blue planet? (II) Even though the use of pesticides increases the crop production, they adversely affect the living organisms. Explain the function and the adverse effects of the pesticides

Answer»

(I)

1. Hydrosphere include all types of water sources like oceans, seas, rivers, lakes, streams, underground water, polar ice – caps, clouds etc.

2. It covers about 75% of the earth’s surface. Hence earth is called as Blue planet:

(II) Pesticides are the chemicals that are used to kill or stop the growth of unwanted organims. But these pesticides can affect the health of human beings. Pesticides are classified as

1. Insecticides

2. Fungicides and

3. Herbicides.

1. Insecticides:

Insecticides like DDT, BHC, Aldrin can stay in soil for a long period of time and are absorbed by soil. They contaminate root crops like carrot, radish..

2. Fungicides:

Organomercury compounds dissociate in soil to produce mercury which is highly toxic.

3. Herbicides:

They are used to control unwanted plants and are also known as weed killers.

Eg, Sodium chlorate, sodium nitrate. They are toxic to mammals.

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