Multiple choice

The use of insecticides now-a-days is not preferred because:

  1. they are costly and not easily available

  2. insects have developed resistance to them

  3. insecticides are not degraded and hence also enter the human body through food chain

  4. both (2) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Insecticide use declined primarily because insects evolved resistance through natural selection, making many chemicals ineffective. Additionally, persistent insecticides like DDT bioaccumulate through food chains, causing ecological harm and entering human tissues. These problems outweigh availability concerns, as synthetic insecticides remain widely produced.

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