Choose the Best Answer · Q17
Q.The questions given below consists of an assertion and the reason. Choose the correct option out of the choices given below each question:
i) Both (A) and (R) are correct and (R) is the correct explanation of (A)
ii) Both (A) and (R) are correct and (R) is not the correct explanation of (A)
iii) Both (A) and (R) are not correct
iv) (A) is correct but (R) is not correct
Assertion (A): Oxygen plays a key role in the troposphere.
Reason (R): Troposphere is not responsible for all biological activities.
Reason (R): Troposphere is not responsible for all biological activities.
(a) i
(b) ii
(c) iii
(d) iv
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Start your 14-day free trial to unlock the full solution →Step 1. Assertion: oxygen plays a key role in the troposphere. This is TRUE -- the troposphere is the layer (0-10 km, ~78% N₂/21% O₂) where humans, animals and plants exist and depend on atmospheric oxygen for respiration, combustion and related processes.
Step 2. Reason: the troposphere is NOT responsible for all biological activities. This contradicts the unit's own framing -- the troposphere is explicitly described as the region 'in which man, animal and plants exist,' i.e. it is exactly where the biosphere's biological activity t …
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