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 intersegmental septum of 14th and 15th segments
Two pairs of testes in 10th and 11th segments
Two pairs of accessory glands in 16-18 segments
Earth worm (Pheretima Posthuma) -
it belongs to phylum Annelida, class-Oligochaeta. Earthworm is a nocturnal animal because it is sensitive to light.
-
Spermathecae in earthworm -
Four pairs of spermathecae are present. one pair in each of 6th, 7th 8th and 9th segments. They receive and store the spematozoa of another earthworm during copulaiton.
-
Body structure of Earthworm -
The body of earthworm has about 100-120 segments (metameric). The first segment is called as buccal segment or peristomium, which bears the opening of the mouth.
-
Alimentary canal of earthworm -
it is straight tube and runs between the 1st and last segment of the body.
- wherein
1st - 3rd segment Buccal cavity
4th segment Pharynx
5th - 7th segment Oesophagus
8th segment Gizzard
9th - 14th segment stomach with calciferous gland which produces to neutralise the humic acid
15th - last segment Intestine
Option 1)
Four pairs of spermathecae in 4-7 segments
This solution is incorrect
Option 2)
One pair of ovaries attached at intersegmental septum of 14th and 15th segments
This solution is incorrect
Option 3)
Two pairs of testes in 10th and 11th segments
This solution is correct
Option 4)
Two pairs of accessory glands in 16-18 segments
This solution is incorrect