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The clitellum or cingulum in Earthworm is present in
- a)12,13 and 14 Segments
- b)13,14 and 15 segments
- c)14,15 and 16 segments
- d)16,17 and 18 segments
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
The clitellum or cingulum in Earthworm is present ina)12,13 and 14 Seg...
Correct Answer :- c
Explanation : Clitellum or cingulum- It is a circular or glandular band around 14th, 15th, and 16th It secrets albumen, globulin and egg case(cocoon). It divides the body of the earthworm into pre-clitellar, clitellar and post-clitellar.
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The clitellum or cingulum in Earthworm is present ina)12,13 and 14 Seg...
Location of Clitellum in Earthworm
The clitellum, also known as the cingulum, is a thickened glandular and non-segmented portion of the body wall in earthworms. It is responsible for secreting the mucous cocoon in which the eggs are deposited during reproduction.
Segments where Clitellum is Present
- The clitellum is typically located in segments 14, 15, and 16 of an earthworm's body.
- It spans across these three segments and is noticeable as a swollen, lighter-colored band encircling the worm's body.
Role of Clitellum in Reproduction
- During mating, earthworms align ventrally and exchange sperm cells.
- The clitellum secretes a mucous sheath, which slides over the worm's head and picks up the eggs and sperm from the sperm grooves.
- As the sheath moves forward, it picks up more eggs and sperm from the seminal receptacles and male pores, eventually closing at the front.
- The fertilized eggs are deposited in the soil within the cocoon, which protects the developing embryos.
Conclusion
In conclusion, the clitellum in earthworms is a crucial structure involved in reproduction. Its presence in segments 14, 15, and 16 marks the reproductive maturity of the worm and plays a key role in the formation of the protective cocoon for the eggs.
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The clitellum or cingulum in Earthworm is present ina)12,13 and 14 Segmentsb)13,14 and 15 segmentsc)14,15 and 16 segmentsd)16,17 and 18 segmentsCorrect answer is option 'C'. Can you explain this answer?
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