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Which of the following structures are located in the 4^th, 5^th and 6^th segments of Pheretima ?

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Lateral hearts and intestinal caecae

Spermathecae and accessory glands

Pharyngeal nephridia and lymph glands

Blood glands and pharyngeal nephridia

answer is D.

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Detailed Solution

Blood glands and pharyngeal nephridia are located in the 4^th, 5^th and 6^th segments of Pheretima.

A pair of short and conical intestinal caecae project from the intestine on the 26th segment.

Four pairs of spermathecae are located in 6th-9th segments (one pair in each segment).

Lateral hearts are present in 7th and 9th segments (one pair in each segment).

The lymph glands are present on the dorsal blood vessel from 26th segment to the last segment.

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