Question

On which segments of earthworms are testes present?

• A. 13 and 14
• B. 10 and 11
• C. 9 and 10
• D. 14 and 15

Answer 1

The correct option is B

10 and 11

The correct option is option B.

Explanation of correct option:

1. The testes, testis sacs, seminal vesicles, periductal funnel, vasa deferentia, prostate glands, and accessory glands make up the male reproductive organs.
2. The following are the male reproductive organs:

Structure	Number	Location
Testis	2 pairs	10th and 11th segment
Testis sacs	1 pair	10th and 11th segment

Explanation of incorrect option:

Option A:

1. A pair of ovaries is located between the 12th and 13th segments.

Option C:

1. In the 6th and 9th segments, spermathecae (four pairs) are sac-like structures.
2. In the tenth and eleventh segments, they have two pairs of testes.

Option D:

1. Under the ovaries, there are ovarian funnels that continue into the oviduct, unite, and eventually open on the 14th segment's ventral side as a single median female genital pore.

Final answer: Testes are present in segments 10 and 11.