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- #National Eligibility Cum Entrance Test
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Choose the incorrectly matched pair regarding the position of reproductive structure in earthworm.
Option: 1
Testes- 10th-11th segment
Option: 2
Spermatheca- 6th- 9th segment
Option: 3
Male genital pore- 9th segment
Option: 4
Female genital pore- 14th segment
Answers (1)
Reproduction and Development in Earthworm
- Earthworm is hermaphrodite, that is, male and female reproductive organs are present in the same individual.
- Earthworms do not self-fertilize because testes mature earlier than the ovaries.
Female reproductive system
- It consists of the following structures
- Ovaries- these are a pair of white minute masses attached to the septum present between the 12th and 13th segments. These are the sites of gametogenesis.
- Oviducts and oviducal funnel- these collect eggs and pass them outside into the cocoon through a female genital aperture.
- Spermathecae- Four pairs of spermatheca are located in the 6th-9th segments (one pair in each segment). They receive and store spermatozoa during copulation
- During mating, two worms mutually exchange sperms
- These two worms mate by juxtaposing opposite gonadal openings and exchanging packets of sperm called spermatophores
- The mature sperm and egg cells and nutritive fluid are deposited in cocoons produced by the gland cells of the clitellum
- Fertilization and development occur within the cocoons which are deposited in soil
- After fertilization, the cocoon slips off the worm and is deposited in or on the soil
- The cocoon holds the worm embryos.
- Each cocoon then produces 2-20 baby worms.
- Development of earthworms is direct i.e. there is no larva formed.
- Male genital pore is located at the mid-ventral line of the 18th segment.
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