In a school practical, three test tubes, A, B, and C were kept in front of a student. “A” has some starch in it, “B” has protein powder in it and “C” has fats in it. The teacher gave three chemical bottles to the student and asked to pour them into respective test tubes such that those contents can be broken down into simpler forms.
[One bottle per test tube must be used]
- Bottle 1 contains an enzyme that is secreted inside the mouth
- Bottle 2 contains an enzyme that is secreted by the pancreas
- Bottle 3 contains an enzyme that is secreted by the stomach. [3 Marks]
In a school practical, three test tubes, A, B, and C were kept in front of a student. “A” has some starch in it, “B” has protein powder in it and “C” has fats in it. The teacher gave three chemical bottles to the student and asked to pour them into respective test tubes such that those contents can be broken down into simpler forms.
[One bottle per test tube must be used]
- Bottle 1 contains an enzyme that is secreted inside the mouth
- Bottle 2 contains an enzyme that is secreted by the pancreas
- Bottle 3 contains an enzyme that is secreted by the stomach. [3 Marks]
The answer is:
Bottle 1 (Amylase) - Test tube A [1 Mark]
Bottle 2 (Lipase) - Test tube C [1 Mark]
Bottle 3 (Pepsin) - Test tube B [1 Mark]
Explanation: Chemical digestion in humans takes place in the mouth, stomach and in the small intestine. Inside the mouth the salivary glands secrete the amylolytic enzyme salivary amylase which digests the complex starch into simpler sugars. In the stomach starts the protein digestion where the proteolytic enzyme pepsin hydrolyses the complex proteins into simpler peptides. This takes place due to the acidic pH provided by the HCl inside the stomach. The small intestine receives the secterions (pancreatic lipase, amylase and trypsin) from small intestine and digests fats, proteins and complex starch into fatty acids and glycerol, amino acids and simple sugars respectively. Hence, the test tube A containing starch will be digested by the enzyme (salivary amylase) in bottle 1. The test tube B containing protein powder will be digested by the enzyme (pancreatic enzyme trypsin) present in bottle 3. The test tube C containing fats will be digested by the enzyme (lipase) in bottle 2.
The answer is:
Bottle 1 (Amylase) - Test tube A [1 Mark]
Bottle 2 (Lipase) - Test tube C [1 Mark]
Bottle 3 (Pepsin) - Test tube B [1 Mark]
Explanation: Chemical digestion in humans takes place in the mouth, stomach and in the small intestine. Inside the mouth the salivary glands secrete the amylolytic enzyme salivary amylase which digests the complex starch into simpler sugars. In the stomach starts the protein digestion where the proteolytic enzyme pepsin hydrolyses the complex proteins into simpler peptides. This takes place due to the acidic pH provided by the HCl inside the stomach. The small intestine receives the secterions (pancreatic lipase, amylase and trypsin) from small intestine and digests fats, proteins and complex starch into fatty acids and glycerol, amino acids and simple sugars respectively. Hence, the test tube A containing starch will be digested by the enzyme (salivary amylase) in bottle 1. The test tube B containing protein powder will be digested by the enzyme (pancreatic enzyme trypsin) present in bottle 3. The test tube C containing fats will be digested by the enzyme (lipase) in bottle 2.
