First slide

Earthworm

Question

Earthworm does not have specific sensory structures, yet they are sensitive to which of the following?
(a) Light intensities
(b) Chemical stimuli
(c) Vibrations in the ground

Easy

A

Only (a)
B

Only (a) and (c)
C

Only (c)
D

(a), (b) and (c)

Solution

Specific sensory structures are absent in the earthworm, yet it can distinguish the light intensities and feel the vibrations in the ground. Worms have specialised chemoreceptors (taste receptors) which react to chemical stimuli as well.

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