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Q.

Given below are few characterisitic features of phylum – Platyhelminthes 

I. Scolex is present at the posteriormost end of the body

II. Alimentary canal is absent in all stages of its life cycle

III. Aerobic respiration is found and gaseous exchange takes place through general body surface

IV. The excretory system consists of long canals, capillaries and the protonephridia or flame cells

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a

II and IV

b

I and II

c

I, II and IV

d

I and IV

answer is B.

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Detailed Solution

In phylum platyhelminthes the anaerobic respiration is observed.

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