Which one of the following correctly describes the location of some body parts in the earthworm (Pheretima) ?
- Four pairs of spermathecae in 4-7 segments
- One pair of ovaries attached at inter-segmental septum of 14th and 15th segments
- Two pairs of testes in 10th and 11th segments
- Two pairs of accessory glands in 16-18th Segments
The Correct Option is C
Solution and Explanation
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- Transcription
Concepts Used:
Earthworm
An earthworm is a terrestrial invertebrate that is to the phylum Annelida. They display a tube-within-a-tube body plan; they are externally subdivided with corresponding internal subdivision, and they usually have setae on all divisions. They arise worldwide where soil, water, and temperature allow.
Generally, earthworms are found in soil, eating a wide variety of organic matter. This organic matter incorporates plant matter, rotifers, nematodes, bacteria, living protozoa, fungi, and other microorganisms. An earthworm's digestive system runs the expanse of its body. An earthworm respires throughout its skin. It has a double transport system made up of coelomic fluid that goes within the fluid-filled coelom and a simple, closed circulatory system.
It has a nervous system - “central and peripheral”. Its central nervous system comprises two ganglia above the mouth, one on either side, connected to a nerve running along its length to motor neurons and sensory cells in each segment. Large numbers of chemoreceptors concentrate close to its mouth.
Read More: Reproductive System of Earthworm