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Solved Examples on Evolution

(1) According to one of the most widely accepted theories the earth’s atmosphere, before any life had originated on this planet, consisted of a mixture of [CPMT 1981, 84, 2002]

(a) Water vapour, H2, NH3 and CH4 

(b) H2, CO2, NH3 and CH4          

(c) CO2, NH3, CH4 and water vapour

(d) CH4, O2 and water vapour

Answer: a

Solution:

According to one of the most widely accepted theories the earth’s atmosphere, before any life had originated on this planet, consisted of a mixture of Water vapour, H2, NH3 and CH4.

(2) If there was no CO2 in the earth's atmosphere, the temperature of earth's surface would be       [CBSE PMT 1998]

(a) Same as present                                

(b) Less than the present         

(c) Higher than the present                             

(d) Dependent on the amount of oxygen in the atmosphere

Answer:  b

Solution:

If there was no CO2 in the earth's atmosphere, the temperature of earth's surface...

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