Q1
What do rods in the retina detect?
ALight intensity (night vision)
BColour only
CSound
DTouch
ICSEClass 10 (ICSE)BiologyCh 11 · Topic 1
The Sense Organs
Sense organs like the eye and ear detect stimuli from the environment, converting them into nerve impulses for the brain to interpret.
Core concept
The eye's retina contains rods (detecting light intensity, night vision) and cones (detecting colour), converting light into nerve impulses.
How it works
The lens of the eye focuses light onto the retina, with the ciliary muscles adjusting its shape for near or far vision (accommodation).
Why it matters
The ear's cochlea, in the inner ear, contains hair cells that convert sound vibrations into nerve impulses sent to the brain.
Key detail
The semicircular canals in the inner ear help maintain balance by detecting changes in head position and movement.
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Quick notes
• Retina: rods (light intensity) and cones (colour).
• They convert light to nerve impulses.
• Lens focuses light onto the retina.
• Ciliary muscles adjust lens shape (accommodation).
• Cochlea (inner ear): converts sound to nerve impulses.
• Hair cells in cochlea detect vibrations.
• Semicircular canals help maintain balance.
• They detect head position and movement changes.