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Get Answers to all your Questions
- #Class 11
- #Biology
- #National Eligibility Cum Entrance Test
- #Structural Organisation in Animals and Plants
- #Medical
- #National Eligilibility Cum Entrance Test
Cocoons are produced by glands of
Option: 1
Prostomium
Option: 2
Clitellum
Option: 3
Nephridia
Option: 4
Ovary
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- fertilise 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 12th and 13th segments. These are the sites of gametogenesis.
- Oviducts and oviducal funnel- these collect eggs and pass them to outside into the cocoon through a female genital aperture.
- Spermathecae- Four pairs of spermatheca are located in 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 juxtaposing opposite gonadal opening 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 clitellum
- Fertilization and development occur within the cocoons which are deposited in soil
- After fertilisation, 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 earthworm is direct i.e. there is no larva formed.
- The mature sperm and egg cells and nutritive fluid are deposited in cocoons produced by the gland cells of clitellum. Fertilization and development occur within the cocoons which are deposited in soil.
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