Multiple choice

Many mosquitoes are now resistant to DDT because

  1. DDT caused gene mutation in mosquitos

  2. DDT resistant forms got naturally selected and reproduced

  3. DDT inhibits competition among mosquitos

  4. DDT triggers the synthesis of resistant proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Many mosquitoes are now resistant to DDT because of natural selection i.e., previously resistant forms survived and reproduced better mosquitoes than the  non-resistant forms.

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