Question

Which of the following increases the efficiency of food absorption in earthworm?

• A. The liver, which stores extra food in addition to making metabolic enzymes
• B. The cecum, which stores unsuitable intake for excretion
• C. Infolds, which add surface area to the intestine
• D. Malphigian tubules, which increase the density of the food
• E. The liver, which absorbs excess sugar and stores it as glycogen

Answer 1

Answer: (C)

Infolds, which add surface area to the intestine

The digestive system of both earthworms and grasshoppers consists of several folds which increase the efficiency of food absorption by increasing the surface area of the intestine. After grinds of food by gizzard, the intestine absorbs it. The inward fold of the intestine, also known as the typhlosole, gives the earthworm's intestine more absorptive surface area and gives sufficient secretion for absorption.