Only Mataehyung will answer this
1. The presence of which of these components in air varies from place to place?
(a) oxygen
(b) nitrogen
(c) carbon dioxide
(d) water vapour
2. Which of these is not true for combustion?
(a) Oxygen is formed.
(b) Carbon dioxide is formed.
(c) Oxygen is used up.
(d) Nitrogen does not change.
3. Which of these is not an organ for taking in oxygen?
(a) lungs
(b) gills
(c) stomata
(d) atmosphere
4. Which of the following gases protects us from ultraviolet rays?
(a) oxygen
(b) ozone
(c) carbon dioxide
(d) nitrogen
5. The percentage of oxygen in the air does not change because
(a) oxygen is not used in any natural process.
(b) oxygen used up in natural processes is negligible.
(c) oxygen used up in some natural processes is renewed by another natural process.
(d) oxygen used up in natural processes is replenished by the ozone layer.
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⇝1) Answer:-
⟹(d) water vapour
❥The air in the atmosphere has some variable components such as water vapour, dust particles, and ozone. Although these are found in small amounts, they varies from place to place and have significant effects on weather and climate.
⇝2) Answer:-
⟹(a) Oxygen is formed
❥During combustion, oxygen is used, giving out carbon dioxide.
⇝3) Answer:-
⟹(d) Atmosphere
❥Atmosphere is the thin layer of air that surrounds the earth. It is made up of various gases such as oxygen, nitrogen, carbon dioxides, dust particles and water vapour.
⇝4) Answer:-
⟹(b) ozone
❥The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface. Most importantly, it absorbs the portion of UV light called UVB. UVB is a kind of ultraviolet light from the sun (and sun lamps) that has several harmful effects.
⇝5) Answer:-
⟹(c) oxygen used up in some natural processes is renewed by another natural process
❥The oxygen used in respiration and combustion is replaced by the oxygen generated by plants during photosynthesis.
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