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NSC Life Sciences – South Africa

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Question 21

Which of the following best explains the concept of genetic variation?
DNA and geneticsGenetic variation and inheritancemedium

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Question 22

Which organ system is primarily responsible for transporting oxygen to body cells?
Human physiologyTransport systems in humanseasy

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Question 23

How does predation affect population size in an ecosystem?
EcologyInteractions in ecosystemsmedium

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Question 24

Why is biodiversity important to an ecosystem's stability?
Environmental studiesBiodiversity and ecosystem stabilitymedium

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Question 25

Which hormone is primarily responsible for regulating blood sugar levels?
Human physiologyHormonal regulationmedium

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Question 26

Which reproductive strategy involves producing many offspring with little parental care?
ReproductionReproductive strategieshard

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Question 27

What is the role of decomposers in an ecosystem?
EcologyNutrient cyclingeasy

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Question 28

What is the complementary DNA base for adenine (A)?
DNA and geneticsDNA and geneticseasy

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Question 29

Which organ is primarily responsible for filtering waste products from the blood?
Human physiologyHuman physiologyeasy

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Question 30

Which human body system controls and coordinates body activities through electrical signals?
Human physiologyHuman physiologyeasy

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