Clitellum of Pheretima is thick girdle that is

Non-glandular around 14-16 segments

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Glandular around 14-16 segments

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Glandular around 16-18 segments

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Non-glandular around 16-18 segments

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Solution

The correct option is D Glandular around 14-16 segments
In a mature worm, segments 14-16 are covered by a prominent dark band of glandular tissue called clitellum. Thus the body is divisible into three prominent regions preclitellar, clitellar and post clitellar segments.
So the correct answer is 'Glandular around 14-16 segments'.

Suggest Corrections

Group	$6 - 8$	$8 - 10$	$10 - 12$	$12 - 14$	$14 - 16$	$16 - 18$	$18 - 20$
Frequencies	$12$	$20$	$16$	$15$	$17$	$8$	$12$