NEET 2012 Biology question

Select the correct statement from the ones given below with respect to Periplaneta americana

(1)Grinding of food is carried out only by the mouth parts
(2)Nervous system located dorsally, consists of segmentally arranged ganglia joined by a pair of longitudinal connectives
(3)Males bear a pair of short thread like anal stylesCorrect
(4)There are 16 very long Malpighian tubules present at the junctions of midgut and hindgut

Answer: (3)

Solution

In the male cockroach, the ninth abdominal segment bears a pair of short, thread-like anal styles, which are absent in females. So (3) is correct. (1) is wrong: food is ground by the gizzard (proventriculus) as well, with the chitinous teeth, besides being chewed by

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Question ID VK-091237