Unit 2: Form and Function
Topic 2.7: Transport Systems Questions
Practice 20 exam-style questions for IB Biology Topic 2.7. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
Which structure absorbs water from the soil, giving a large surface area for uptake into the plant?
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Which feature distinguishes a capillary from an artery and a vein?
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State what happens to the water in the xylem immediately after water evaporates from the mesophyll cells of a leaf.
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What is the role of HDLs (high-density lipoproteins) in cholesterol transport?
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Identify two possible causes of a high level of blood cholesterol.
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State one health risk linked to consuming too much sodium (salt).
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Which chamber of a mammalian heart has the thickest, most muscular wall?
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State the feature of a capillary wall that allows substances to be exchanged with the tissues quickly.
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Which of these is a structural feature of a phloem sieve tube cell?
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A diet that is consistently high in salt (sodium) most directly increases the risk of:
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State the main reason haemoglobin is required in the blood.
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State the role of HDLs (high-density lipoproteins) in transporting cholesterol.
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Which statement correctly describes systolic blood pressure?
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What does translocation in the phloem move, and in which direction?
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State one structural feature of a phloem sieve tube cell.
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Which cell, found alongside the sieve tube, supplies the energy to load sugar into the phloem?
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Capillaries form a dense network running close to every cell in a tissue.
Outline two structural features of capillaries that make the exchange of substances with the surrounding tissues efficient.
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How does an increase in humidity affect the rate of transpiration, and why?
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A drop of deoxygenated blood has just entered the right atrium.
Which route does it follow to reach the lungs?
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After sugar is loaded into a sieve tube at the source, what makes the sap actually move along the phloem?
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