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Pollutants and Their Classification

Complete the ...

Question

Complete the crossword puzzle with the hints given below.

DOWN:
1.The blanket of air that surrounds Earth is called.
2.The layer that protects from harmful UV rays is.

ACROSS:
1.The gas used as food preservative is.
2.Plants take_ for their respiration.

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Q. Replace the following with a word or a phrase.
(a) air in motion
(b) the liquid used to test for carbon dioxide
(c) the layer of air surrounding the earth
(d) increase in the temperature of the earth's atmosphere
(e) harmful rays from the sun
(f) the amount of water vapour present in the air
(g) a poisonous gas given out from the exhaust pipes of cars.
(h) addition of harmful substances to the atmosphere

Solve the following crossword puzzle by identifying the names of gases from the information given about them.

Across

3. The gas which is a major constituent of CNG used as fuel.

4. The gas which is the major constituent of earth's atmosphere.

5. A gas which is produced inside the sun by fusion reaction.

6. The gas found in stratosphere that absorbs harmful UV radiations from the sun and prevents them from reaching earth surface.

Down

Complete the following word puzzle with the help of clues given below.

Down

1. Providing water to the crops.

2. Keeping crop grains for a long time under proper conditions.

5. Certain plants of the same kind grown on a large scale.

Across

3. A machine used for cutting the matured crop.

4. A rabi crop that is also one of the pulses.

6. A process of separating the grain from chaff.

Q. Complete the following statements by using the correct option from those given below.
(Irradiation, dehydration, pasteurization, natural, chemical)
(a) Drying the food grains from farms under the hot sun is called .......... .
(b) Materials like milk are instantly cooled after heating up to a certain high temperature. This method of food preservation is called .......... .
(c) Salt is a .......... type of food preservative.
(d) Vinegar is a .......... type of food preservative.

Q. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down (D)
(1) Thorough washing

(2) Animal fibre

(3) Long thread like structure

Across (A)
(1) Keeps warm

(2) Its leaves are eaten by silkworms

(3) Hatches from egg of moth

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Pollutants and Their Classification

Standard XII Chemistry

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