Question

In Earthworm, ovary is situated in segment
A. 13
B. 9
C. 10
D. 26

Answer 1

Hint:- Earthworms are invertebrates living under the surface of the soil. They belong to the order Opisthopora belonging to the phylum Annelida. They are commonly found in the soil and feed on a variety of organic matter. They lack a true skeleton and instead body structure is maintained with fluid-filled coelom.

Complete step-by-step solution:-
The body of the animal is represented by a tube-like structure with segments present all throughout the body. The external segmentations correspond to the internal segmentation of the body. The segments are ring-like structures. It gives the appearance that the body is formed by the fusion or joining of several segments. There are as many as hundreds of segments present in the body. The segmentation provides for important structural functions.
Each segment of the body consists of muscles and bristles which are called the setae. The setae helps the animal to anchor and control during movements. The segments are also specific in terms of position of the internal organs such as the digestive organ, excretory organs and the organs of reproduction.
The earthworm is a hermaphrodite animal but self-fertilization does not occur. It contains both the male and the female organs but the organs are arranged at different segments. The reproductive segments are present on the segments. The male reproductive organs consist of testes, testis sacs, seminal vesicle, spermatic funnel, prostate glands as well as other accessory glands. It consists of two pairs and they are present at the segments,and the segments.
THe female reproductive organs are the ovaries, oviducts and the spermatheca. The ovaries are found in a single pair and are situated at the segment. The ovaries appear as a finger-like projection consisting of developing ova that appear as series of bead like structures. Below the ovaries, in the same segment, oviducts or ovarian funnel is found. They join to form a single female genital aperture at the segment.
The digestive system consisting of the muscular gizzards and the stomach is found in the segment.
The segment of the body, there occurs a pair of short and conical structures which is known as the intestinal caeca.

Therefore, the correct option is option A.

Note:- In earthworm, the body is segmented. It is a hermaphrodite organism and consists of both male and female organs of reproduction. The female reproductive system of the earthworm consists of ovaries, oviduct and genital aperture. The ovaries are found at the segment of the body. There are one pair of ovaries that are present in this body segment.