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A student was given a specimen to identify on the basis of the characteristics given below.
(i) They are metamerically segmented.
(ii) Presence of closed circulatory system.
(iii) They have circular and longitudinal muscles for locomotion.
Identify the specimen.

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Pila

Pheretima

Periplaneta

Physalia

answer is B.

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Detailed Solution

Pheretima (earthworm) belongs to Annelida. It exhibits metamerism. It has closed circulatory system. Circular and longitudinal muscles help in locomotion.

Periplaneta (cockroach) has open circulatory system.

Pila (apple snail) is unsegmented.

Physalia (Portuguese man of war) does not exhibit segmentation or closed circulatory system. It belongs to Cnidaria.

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