CIE iGCSE Co-Ordinated Science B7.3 Digestion Exam Style Questions Paper 1
▶️ Answer/Explanation
Oils are lipids made of fatty acids joined to glycerol.
The enzyme lipase catalyses the hydrolysis of lipids during digestion.
This breaks the lipid down into its building blocks, fatty acids and glycerol.
✅ Answer: (C)
The enzyme lipase catalyses the hydrolysis of lipids during digestion.
This breaks the lipid down into its building blocks, fatty acids and glycerol.
✅ Answer: (C)
▶️ Answer/Explanation
Saliva contains the enzyme salivary amylase, which breaks down starch (a large insoluble molecule) into smaller sugar molecules — this is digestion.
The resulting sugars are small enough to pass through the partially permeable membrane into the water outside, confirming that chemical digestion occurred inside the bag.
✅ Answer: (B)
The resulting sugars are small enough to pass through the partially permeable membrane into the water outside, confirming that chemical digestion occurred inside the bag.
✅ Answer: (B)
▶️ Answer/Explanation
Chemical digestion breaks large insoluble molecules down into small, soluble molecules using enzymes.
These small molecules can then be absorbed into the blood through the wall of the small intestine.
Breaking food into smaller pieces without chemical change is physical digestion (statement 1), and chemical digestion never makes molecules larger (statement 2), so only 3 and 4 are correct.
✅ Answer: (D)
These small molecules can then be absorbed into the blood through the wall of the small intestine.
Breaking food into smaller pieces without chemical change is physical digestion (statement 1), and chemical digestion never makes molecules larger (statement 2), so only 3 and 4 are correct.
✅ Answer: (D)
▶️ Answer/Explanation
Digestion is the chemical breakdown of large insoluble food molecules into small soluble molecules.
This chemical breakdown is carried out by enzymes such as amylase, protease and lipase.
Absorption, egestion and ingestion are physical movements of substances and do not require enzymes.
✅ Answer: (B)
This chemical breakdown is carried out by enzymes such as amylase, protease and lipase.
Absorption, egestion and ingestion are physical movements of substances and do not require enzymes.
✅ Answer: (B)
▶️ Answer/Explanation
In this diagram, the labelled part corresponding to the stomach/pancreas region produces digestive enzymes.
The labelled part corresponding to the large intestine absorbs water from undigested food.
The labelled part corresponding to the gall bladder stores bile before release into the small intestine.
Matching these functions to R, S and P respectively gives the correct row.
✅ Answer: (C)
The labelled part corresponding to the large intestine absorbs water from undigested food.
The labelled part corresponding to the gall bladder stores bile before release into the small intestine.
Matching these functions to R, S and P respectively gives the correct row.
✅ Answer: (C)