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STD 11 - 7. Structural organisation in animal — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 7. Structural organisation in animal1 Mark
MCQ
Select the correct statement regarding Periplanata americana
  • A
    There are $16$ very long malpighian tubules present at the junctions of midgut and hindgut.
  • B
    Grinding of food is carried out only by the mouth parts.
  • C
    Nervous system is located dorsally and consists of segmentally arranged ganglia joined by a pair of longitudinal connectives.
  • ✓
    Males bear a pair of short thread like anal styles.
✓

Answer

Correct option: D.
Males bear a pair of short thread like anal styles.
d
Anal style is a pair of short, thread-like structure present in males only. In both sexes, the $10$ th segment bears of pair of jointed filamentous structures called anal cerci.

There are about $150$ tubules in each cockroach.

The nervous system is present ventrally

Grinding of food is carried out by Gizzard

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