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Q.

Crows cannot see______coloured beetles on the green leaves of the bushes. 

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a

red

b

both color

c

none of these

d

green

answer is B.

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Detailed Solution

  • Crows are unable to see green-coloured beetles on the green leaves of the bushes. So, crows cannot eat them. 
  • That’s why: the progeny of green beetles is not eaten, while the progeny of red beetles continues to be eaten. As a result, there are more and more green beetles than red ones in the beetle population.
     
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