Question

In earthworm, gizzard is found in

• A. Eighth to tenth segment
• B. Eighth segment
• C. Twenty-seventh segment
• D. Eighth to eleventh segment

Answer 1

The correct option is B

Eighth segment

The correct option is B.

Explanation of the correct option:

Option B:

1. The gizzard is a thick muscular organ found in earthworms.
2. It is found in the 8th segment of the earthworm.
3. Gizzard is a part of the digestive system along with the pharynx, the esophagus, the crop, the intestine, etc.
4. Gizzard is formed when the esophagus expands and modifies into a large, distinct, muscular organ.
5. The gizzard helps in the digestion process.
6. It reduces the particle size of food, and also helps in the chemical degradation of nutrients.
7. It also regulates the feed flow and responds immediately to the changes in the coarseness of diet.

Explanation of the incorrect option:

Option A:

1. The 8th to 10th segment of the earthworm comprises spermathecal apertures.
2. They help in the reproduction process.
3. This is an incorrect option.

Option B:

1. The twenty-seventh segment of the earthworms consists of the typhlosole segment.
2. It helps to increase the intestinal surface area for reabsorption.
3. The typhlosole can have multiple origins.
4. The gizzard region is not found in between the twenty-seventh segment.

Option C:

1. The eighth to eleventh segment consists of the elongation of the stomach and intestine and the male reproductive system.
2. The male reproductive system helps to form the male gamete for the reproduction process.
3. This is an incorrect option as the gizzard region is not found in the eighth to eleventh segment.

Final answer: In earthworms, the gizzard is found in the eighth segment