Which of the following are sensory organs in a cockroach?

Antennae

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Gizzard

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Ommatidia

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Anal cerci

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Solution

The correct option is D Anal cerci
Cockroaches use their antennae to perceive physical objects.
It uses its ommatidia or compound eyes to receive several images of an object (mosaic vision).
The anal cerci detects vibrations from their surroundings.
Other sense organs are maxillary palps, labial palps, etc.

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Q. Which of the following is not a sensory organ in arthropods?

Consider the following four statements regarding the nervous system of a cockroach and choose the correct option indicating as true (T) or false (F) respectively.

1. The Brain of a cockroach is primitive and is made of 2 supra-oesophageal and 1 sub-oesophageal ganglia, connected by 2 circum-oesophageal connectives.

2. It has 3 thoracic and 6 abdominal, segmental ganglia.

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