Which term identifies the main digestive section where most nutrient absorption occurs in an earthworm?

Which term identifies the main digestive section where most nutrient absorption occurs in an earthworm?

• A. Intestine
• B. Crop
• C. Waste removal tubes
• D. Aortic arches

Answer: (A)

In earthworms, the main site where nutrients are absorbed into the body is the intestine. After Food moves from the crop, which stores it, and is ground in the gizzard, it reaches the intestine where digestion continues and nutrients pass through the intestinal lining into the bloodstream. The intestine has a large surface area to maximize absorption, often with folds that increase contact with digested material. The crop is for storage, not absorption; waste removal tubes (nephridia) handle excretion; and the aortic arches are part of the circulatory system, not digestion. So the intestine is where most nutrient absorption occurs.

In earthworms, the main site where nutrients are absorbed into the body is the intestine. After Food moves from the crop, which stores it, and is ground in the gizzard, it reaches the intestine where digestion continues and nutrients pass through the intestinal lining into the bloodstream. The intestine has a large surface area to maximize absorption, often with folds that increase contact with digested material. The crop is for storage, not absorption; waste removal tubes (nephridia) handle excretion; and the aortic arches are part of the circulatory system, not digestion. So the intestine is where most nutrient absorption occurs.