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Human Digestive System — Free MYP1 Sciences Practice Questions
1QuestionAbsorption of Nutrients in the Small IntestineConcept Practice
2 marks~3 minCriterion A
The diagram below shows a cross-section of the wall of the small intestine. Four structures are labelled A, B, C, and D.
Label A: a finger-like projection
Label B: a blood vessel inside the projection
Label C: the outer muscle layer
Label D: the inner lining
Label A: a finger-like projection
Label B: a blood vessel inside the projection
Label C: the outer muscle layer
Label D: the inner lining
a
Identify which label (A, B, C, or D) shows a villus. [1]
b
Describe one way a villus helps the small intestine absorb nutrients. [1]
Solutions
2QuestionJourney of Food Through the Digestive TractConcept Practice
4 marks~6 minCriterion A
The diagram below shows four organs of the digestive system in order.
Organ 1: Food is chewed and mixed with saliva.
Organ 2: Food is mixed with acidic juices and churned.
Organ 3: Nutrients pass into the blood.
Organ 4: Water is removed, forming solid waste.
Organ 1: Food is chewed and mixed with saliva.
Organ 2: Food is mixed with acidic juices and churned.
Organ 3: Nutrients pass into the blood.
Organ 4: Water is removed, forming solid waste.
a
Name each organ. [2]
b
Describe what Organ 2 does to food. [1]
c
Organ 3 absorbs nutrients and Organ 4 absorbs water. Describe one way these two organs do a similar job and one way they do a different job. [1]
Solutions
3QuestionMechanical and Chemical DigestionConcept Practice
3 marks~5 minCriterion C
A student breaks a 1 cm bread cube into smaller pieces by chewing. A second 1 cm bread cube is broken down by stomach acid. The total surface area of the bread pieces is recorded every 2 minutes.
| Time (minutes) | 0 | 2 | 4 | 6 |
|---|---|---|---|---|
| Surface area after chewing (cm²) | 6 | 12 | 24 | 48 |
| Surface area after stomach acid (cm²) | 6 | 9 | 13 | 20 |
a
Identify the surface area of the bread after chewing at 4 minutes. [1]
b
Describe what happens to the surface area of the bread over time when it is broken down by chewing. [1]
c
Compare how quickly chewing and stomach acid increase the surface area of the bread. [1]
Solutions
4QuestionAbsorption of Nutrients in the Small IntestineConcept Practice
5 marks~8 minCriterion B
Anna is learning about how the small intestine absorbs nutrients. She records how much nutrient each section absorbs.
Section 1: 10 g
Section 2: 20 g
Section 3: 30 g
Section 4: 40 g
Section 1: 10 g
Section 2: 20 g
Section 3: 30 g
Section 4: 40 g
a
Name the organ where nutrient absorption takes place. [1]
b
Describe the pattern you see in Anna's data. [2]
c
Anna says Section 5 will absorb more nutrients than Section 1. State how much Section 5 will absorb, and describe one reason why absorbing more nutrients further along the intestine could be useful for the body. [2]
Solutions
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