Unyben. True
4. Plants use nitrogen to manufacture food.
5. Nitrogen is used in fire-extinguishers.
6. Excess water vapour increases the rate of evaporation.
7. Argon is used in advertisement signs and brake lights.
8. Photosynthesis is the only natural process that releases oxygen into the air.
D. Match the columns.
1. Oxygen
2. Nitrogen
3. Carbon dioxide
a. needed for photosynthesis
b. supports combustion
c. hydrated iron oxide
d. helps in protein synthesis
e. determines climatic conditions
Water vapour
ust
f. burns to produce energy
Incwer the following in short.
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true
true
true
false
false
true
false
true
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