Home / iGCSE Biology (0610)-7.5 Absorption – iGCSE Style Questions Paper 1

iGCSE Biology (0610)-7.5 Absorption – iGCSE Style Questions Paper 1

IGCSE Biology (0610) Practice Questions Paper 1 - All Chapters

Question

What is absorbed in the colon and the small intestine?

▶️ Answer/Explanation
The small intestine is the primary site for the absorption of nutrients (digested food) such as glucose and amino acids, but it also absorbs a significant volume of water via osmosis. The colon (large intestine) primarily functions to reabsorb water and mineral salts from the remaining undigested food material to form solid feces. While the colon does not absorb nutrients, both organs are involved in water transport. Therefore, the small intestine absorbs both digested food and water, while the colon focuses on water.
✅ Answer: (D)

Question

Which stage of nutrition takes place when food molecules become part of a body cell?
A   absorption
B   assimilation
C   digestion
D   ingestion
▶️ Answer/Explanation
Detailed solution

The correct answer is B (assimilation).

Nutrition occurs in a sequence where food is first taken in (ingestion) and broken down (digestion). These nutrients then pass into the bloodstream (absorption). Assimilation is the final step where these absorbed molecules move from the blood into the actual body cells. Once inside, they are utilized for energy or incorporated into the cell’s structure to build new protoplasm and tissues. This is the specific stage where nutrients truly become part of the body.

Question

Where does most absorption of nutrients occur?

▶️ Answer/Explanation
Detailed solution

The correct answer is C.

Structure C represents the small intestine, which is the primary site for nutrient absorption. While the esophagus (A) transports food and the pancreas (B) secretes enzymes, the small intestine is uniquely designed with villi and microvilli to maximize surface area for absorbing glucose, proteins, and fats. The large intestine (D) mainly focuses on water recovery. Therefore, nearly 90% of nutrient absorption occurs in the small intestine.

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