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Q.

Which of the following statements are true for sense organs of cockroach?

(a) Antennae, eyes, maxillary palps, labial palps and anal cerci are sense organs.

(b) Mosaic vision has more resolution but less sensitivity.

(c ) Each eye consist of about 2000 hexagonal ommatidia.

(d) Antennae help in monitoring the environment.

(e) Ocelli are simple eyes.

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a

(b) and  (c) only         

b

(b), (c ), and (d) only

c

(a), (c), (d) and (e) only

d

(a), (b), (c) and (d) only

answer is C.

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Detailed Solution

With the help of several ommatidia, a cockroach can receive several images of an object. This kind of vision is known as mosaic vision with more sensitivity but less resolution, being common during night (hence called nocturnal vision).

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