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Interdependence in Organisms — Free MYP1 Sciences Practice Questions
1QuestionConsequences of System FailureConcept Practice
2 marks~3 minCriterion C
A heart attack happens when part of the heart muscle stops getting blood and becomes damaged.
a
Describe one way a heart attack could affect what a person is able to do in their daily life. [1]
b
Describe one thing that a simple model of the heart cannot show about how the heart works. [1]
Solutions
2QuestionCase Studies of System Interactions in Daily LifeConcept Practice
2 marks~3 minCriterion A
The diagram shows a food chain: grass → rabbit → fox.
a
Identify the producer in this food chain. [1]
b
Describe the roles of the rabbit and the fox in this food chain. Use the words "consumer" and "predator" in your answer. [1]
Solutions
3QuestionConsequences of System FailureConcept Practice
2 marks~3 minCriterion B
A student wants to find out why plant leaves turn yellow. She sets up three pots with the same plant and soil. Pot A gets 10 mL of water each day, Pot B gets 20 mL, and Pot C gets 30 mL. All pots get the same amount of sunlight. After one week, she counts the yellow leaves on each plant.
a
Identify the independent variable in this investigation. [1]
b
Identify the dependent variable in this investigation. [1]
In your answers, also name one controlled variable.
In your answers, also name one controlled variable.
Solutions
4QuestionCase Studies of System Interactions in Daily LifeConcept Practice
4 marks~6 minCriterion D
A student looks at leaves from three plants under a microscope and counts the tiny holes (stomata) on each surface.
| Plant | Water lily | Oak | Cactus |
|---|---|---|---|
| Upper surface (stomata per mm²) | 400 | 120 | 50 |
| Lower surface (stomata per mm²) | 0 | 280 | 30 |
a
Name the plant that has the fewest stomata on its upper surface. [1]
b
Describe what happens to water loss in a plant that has fewer stomata. [1]
c
The cactus lives in a hot, dry desert. The water lily lives in a pond. Compare how the number of stomata on each plant helps it survive in its habitat. [2]
Solutions
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