Naman recorded that at rest, he was breathing in and out at the rate of18 times per minute. After playing the footwall for 15 minutes, his breathing rate increased up to 27 times per minute. What could be the reason for this change in breathing rate?
(a) To fulfil the increased demand for water by the body
(b) To fulfil the increased demand for oxygen by the body
(c) To fulfil the increased demand for energy by the body
(d) To fulfil the increased demand for carbon dioxide by the body
6. A researcher wants to do research on penguins. For this, the researcher has to provide favourable conditions to penguins for their survival as they are usually found in polar conditions. What kind of seasonal conditions should be maintained by the researcher in the lab for keeping penguins?
a) : Cold summers and cold winters
b) : Warm summers and cold winters
c) : Wold summers and humid winters
d) : Very warm summers and warm winters
7. Which of the following denotes the correct relation of air with pressure?
(a) Higher the speed of wind, lower is the air pressure.
(b) Lower the pressure of air, lower is the speed of air.
(c) Lower the speed of wind, lower is the mass of air.
(d) Higher the mass of air, higher is the air pressure
8. As a precautionary measure during thunderstorms, it is advised to not use umbrellas with metallic ends or to stand anywhere close to metallic poles and large structures. What might be the reason behind this?
(a) The metallic items my get damaged by lightning.
(b) Heavy rainfall may lead to rusting of metallic structures.
(c) Lightning is attracted by metal, which is a good conductor
(d) In case a heavy metallic object were to fall, it could be fatal.
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Answer:
5) B
to fulfill the increase demand of oxygen by the body
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