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  •  Assertion (A): The cockroach's nervous system is dispersed throughout the entire body.  Reason (R): The thorax contains thr

 Assertion (A): The cockroach's nervous system is dispersed throughout the entire body. 

Reason (R): The thorax contains three ganglia, while the abdomen contains six ganglia.

Option: 1

A and R are correct and R explains A


Option: 2

A and R are correct but R does  not explain the A


Option: 3

A  is wrong and R is correct


Option: 4

A is correct and R is wrong


Answers (1)

best_answer

The cockroach's nervous system is distributed throughout the body. The suboesophageal ganglion gives rise to a twin nerve cord that goes through the thorax and abdomen. The nerve cord has six ganglia in the abdomen (1st-5th and 7th segments) and  three ganglia in the thorax. 

Option b is the correct answer. 

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