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4 marks (−1)

Select the correct statement with respect to Periplaneta americana:

  1. A
    Grinding of food is carried out only by the mouth parts
  2. B
    Nervous system located dorsally, consists of segmentally arranged ganglia
  3. C
    Males bear a pair of short thread-like anal styles
  4. D
    There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

Solution & Step-by-step Explanation

1. Correct: In male cockroaches, a pair of short, thread-like anal styles are present on the 9th sternum, which are absent in females.2. Grinding is also done by the gizzard.3. The nervous system is ventral (not dorsal).4. There are 100-150 Malpighian tubules (not 16).

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Select the correct statement with respect to Periplaneta americana:
A
Grinding of food is carried out only by the mouth parts
B
Nervous system located dorsally, consists of segmentally arranged ganglia
C
Males bear a pair of short thread-like anal styles
D
There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

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Animal KingdomArthropodaCockroach

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