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In Pheretima, ovaries are present in
- a)13th, 14th and 15th segments
- b)15th segments
- c)7th, 8th and 9th segments
- d)13th segments
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In Pheretima, ovaries are present ina)13th, 14th and 15th segmentsb)15...
Ovaries in Pheretima
- Pheretima is a common earthworm found in soil.
- It is a hermaphrodite, i.e., it has both male and female reproductive organs. However, self-fertilization is rare.
- The ovaries of Pheretima are present in the 13th segment.
Answer: D) 13th segment.
Explanation:
- Pheretima has a segmented body, consisting of several segments or rings. The first segment is called the prostomium, which contains the mouth.
- The segments are numbered from anterior to posterior, i.e., from head to tail.
- The reproductive system of Pheretima consists of a pair of ovaries, a pair of testes, and a common genital chamber called the seminal vesicle.
- The ovaries are located in the 13th segment of the body, while the testes are present in the 10th and 11th segments.
- The eggs produced by the ovaries are released into the coelomic fluid, which then flows into the oviducts. The oviducts open into the genital chamber, where they may be fertilized by the sperm from another earthworm.
- The fertilized eggs develop into cocoons, which are deposited in the soil. The cocoons contain several embryos, which hatch into small earthworms.
Therefore, the correct option is D) 13th segment.
- Pheretima is a common earthworm found in soil.
- It is a hermaphrodite, i.e., it has both male and female reproductive organs. However, self-fertilization is rare.
- The ovaries of Pheretima are present in the 13th segment.
Answer: D) 13th segment.
Explanation:
- Pheretima has a segmented body, consisting of several segments or rings. The first segment is called the prostomium, which contains the mouth.
- The segments are numbered from anterior to posterior, i.e., from head to tail.
- The reproductive system of Pheretima consists of a pair of ovaries, a pair of testes, and a common genital chamber called the seminal vesicle.
- The ovaries are located in the 13th segment of the body, while the testes are present in the 10th and 11th segments.
- The eggs produced by the ovaries are released into the coelomic fluid, which then flows into the oviducts. The oviducts open into the genital chamber, where they may be fertilized by the sperm from another earthworm.
- The fertilized eggs develop into cocoons, which are deposited in the soil. The cocoons contain several embryos, which hatch into small earthworms.
Therefore, the correct option is D) 13th segment.
Community Answer
In Pheretima, ovaries are present ina)13th, 14th and 15th segmentsb)15...
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In Pheretima, ovaries are present ina)13th, 14th and 15th segmentsb)15th segmentsc)7th, 8th and 9th segmentsd)13th segmentsCorrect answer is option 'D'. Can you explain this answer?
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