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Question

Select the correct statement about Periplaneta americana.


A
Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
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B
Males bear a pair of short thread like anal styles.
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C
There are very long malpighian tubules present at the junction of foregut and midgut.
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D
Grinding of food is carried out only by mouth parts.
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Solution

The correct option is B Males bear a pair of short thread like anal styles.
Periplaneta americana (American Cockroach) have a well developed nervous system. Their central nervous system consists of the brain and a ventral nerve cord. The nervous system contains fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
A pair of unsegmented, thread-like anal styles is attached to the 9$$^{th}$$ sternite of the male cockroaches. 
Malpighian tubules arise from the junction of midgut and hindgut.
Grinding of food is done exclusively by the mandible.
So, the correct answer is option B.

Biology

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