Question

The location of the lymph gland in Pheretima is
A) 4th, 5th, and 6th segment
B) l0th to 20th segment
C) 26th to the last segment
D) 13th segment

Answer 1

Hint: 1) Pheretima is a genus of earthworms that is mainly found in New Guinea and Southeast Asia.
2) Pheretima species have a clitellum, which is a band of glandular tissue found on segments 14 to 16.
3) Individuals are hermaphroditic, with reproductive or parthenogenetic reproduction.

Complete answer
A) Blood glands are three in number and can be found on the fourth, fifth, and sixth segments. They are responsible for the production of blood cells and hemoglobin. (24) Lymph glands can be found on both sides of the dorsal blood vessel from segment 26th and behind it (one pair per segment, small and whitish). As a result, option A is incorrect.
B) The prostate glands are made up of glandular and non-glandular components and range from the 16th to the 21st segment. The intestine is a large tube that is separated into post-typhlosole segments 15-26. As a result, option B is inaccurate
C) The lymph glands are whitish fuzzy glands that run from the 26th to the last segment of the dorsal blood vessel. They produce phagocytes which destroy dangerous bacteria. The earthworm has accessory glands whose secretions aid in attachment during copulation. As a result, choice C is the right one.
D) The hearts in the earthworm's 12th and 13th segments are known as lateral esophageal hearts, while the anterior pairs in the 7th and 9th segments are known as lateral hearts. As a result, D is incorrect.

Solution
The 26th to the last segment of earthworm contains the fluffy and whitish lymph glands which protect it from enemies. Hence the correct option is C.

Note
1) The presence of the respiratory pigment hemoglobin in Pheretima's blood causes it to be red.
2) Hemoglobin is not present in the corpuscles of vertebrates, but it is found absorbed in plasma.
3) The plasma also includes a large number of colorless and nucleated corpuscles.