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ICSE Class 10 Biology Question 4 of 11

Sense Organs — Question 11

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Question 11

When a person comes out of a cinema hall after a noon show, he experiences a dazzling effect for a short period of time. It happens due to degeneration of (P) ............... and regeneration of (Q) ............... pigments. Which of the following options is correct for P and Q ?

  1. P - Iodopsin, Q - Rhodopsin

  2. P - Rhodopsin, Q - Iodopsin

  3. P - Visual violet, Q - Visual purple

  4. P - Iodopsin, Q - Visual violet

Answer

P - Rhodopsin, Q - Iodopsin

Reason — Rhodopsin pigment is responsible for vision in low light and iodopsin pigment is responsible for vision in bright light. When we enter into bright light from low light the rhodopsin pigment bleaches (degenerates) rapidly due to intense light which causes dazzling effect.