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ICSE Class 10 Biology Question 20 of 21

Multiple-Choice Questions — Question 20

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Question 20

During light adaptation:

  1. Rods and cones become active.
  2. Rods and cones become inactive.
  3. Rods become active and cones inactive.
  4. Cones become active and rods inactive.
Answer

Cones become active and rods inactive.

Reason — The rods, which are more sensitive to low light and are responsible for vision in dim conditions, become inactive in bright light. In bright light, the cones, which are responsible for colour vision and sharp vision in bright conditions, become active.