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Standard XII
Biology
Morphology of Cockroach
Question

Select the correct statement about Periplaneta americana.
  1. There are very long malpighian tubules present at the junction of foregut and midgut.
  2. Males bear a pair of short thread like anal styles.
  3. Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
  4. Grinding of food is carried out only by mouth parts.

A
Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
B
Grinding of food is carried out only by mouth parts.
C
Males bear a pair of short thread like anal styles.
D
There are very long malpighian tubules present at the junction of foregut and midgut.
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Solution
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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 9th 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.

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