CIE iGCSE Co-Ordinated Science B7.3 Digestion Exam Style Questions Paper 2
▶️ Answer/Explanation
Inside each villus there are two main absorbing structures: blood capillaries, which absorb the water-soluble products of digestion (glucose and amino acids), and lacteals, which absorb fatty acids and glycerol (the products of fat digestion).
P is the blood capillary (absorbs glucose and amino acids) and Q is the lacteal (absorbs fatty acids and glycerol), making option D the correct row in the table.
✅ Answer: (D)
P is the blood capillary (absorbs glucose and amino acids) and Q is the lacteal (absorbs fatty acids and glycerol), making option D the correct row in the table.
✅ Answer: (D)
▶️ Answer/Explanation
The pancreas secretes the digestive enzymes amylase, lipase and protease into the small intestine.
Pancreatic insufficiency means fewer of these enzymes are made, reducing all three.
Bile is made by the liver (not the pancreas), and insulin/glucagon are hormones, not digestive secretions, so they are not the answer here.
✅ Answer: (A)
Pancreatic insufficiency means fewer of these enzymes are made, reducing all three.
Bile is made by the liver (not the pancreas), and insulin/glucagon are hormones, not digestive secretions, so they are not the answer here.
✅ Answer: (A)
▶️ Answer/Explanation
Mechanical digestion physically breaks food into smaller pieces, e.g. by chewing, increasing surface area.
No chemical bonds are broken, so the food molecules themselves are unchanged (statement 2).
Turning large molecules into small soluble ones (statements 3 and 4) is chemical digestion, not mechanical.
✅ Answer: (A)
No chemical bonds are broken, so the food molecules themselves are unchanged (statement 2).
Turning large molecules into small soluble ones (statements 3 and 4) is chemical digestion, not mechanical.
✅ Answer: (A)
▶️ Answer/Explanation
Chemical digestion involves the breakdown of large, insoluble food molecules into small, soluble ones that can be absorbed. Physical digestion breaks food into smaller pieces but does not change the molecules chemically.
✅ Answer: (B)
✅ Answer: (B)
▶️ Answer/Explanation
Inside each villus there are two main absorbing structures: blood capillaries, which absorb the water-soluble products of digestion (glucose and amino acids), and lacteals, which absorb fatty acids and glycerol (the products of fat digestion).
P is the blood capillary (absorbs glucose and amino acids) and Q is the lacteal (absorbs fatty acids and glycerol), making option D the correct row in the table.
✅ Answer: (D)
P is the blood capillary (absorbs glucose and amino acids) and Q is the lacteal (absorbs fatty acids and glycerol), making option D the correct row in the table.
✅ Answer: (D)