Chemistry
Write 'true' or 'false' for the following:
(a) Air is a compound. ……………
(b) Carbon dioxide is given out during photosynthesis. ……………
(c) Respiration needs nitrogen. ……………
(d) The composition of air was discovered by Lavoisier. ……………
(e) The major component of air is oxygen. ……………
Air
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Answer
(a) False
Correct Statement — Air is a mixture.
(b) False
Correct Statement — During photosynthesis, oxygen is released and carbon dioxide is absorbed by plants to make food.
(c) False
Correct Statement — Respiration needs oxygen.
(d) True
(e) False
Correct Statement — The major component of air is nitrogen (78 %).
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Related Questions
The gas responsible for ozone depletion is:
- oxygen
- chlorofluorocarbons
- carbon dioxide
- sulphur dioxide
Fill in the blanks:
(a) The layer of air around the earth is called the …………… .
(b) Although we cannot see air, we can …………… it.
(c) Air is a …………… of gases.
(d) Plants and animals maintain the balance of …………… and …………… in air.
(e) Polluted air is …………… for health.
(f) The supporter of combustion in air is …………… .
(g) Green plants need …………… to prepare food.
(h) Oxygen is used in …………… of the food to get …………… .
(i) Aquatic plants and animals use …………… in water.
(j) The reddish brown powder on the surface of iron nails exposed to air and moisture is called …………… .
Match the following
Column A Column B (a) Nitrogen (i) Respiration (b) Dust particles (ii) Fertilizers (c) Carbon dioxide (iii) Combustion (d) Heat and light (iv) Responsible for rain (e) Oxygen (v) Photosynthesis What is air pollution ?