May/June 2026 Paper 23

2026 · 6 questions · 25 parts · 60 marks

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1(a)(i)1(a)(ii)1(a)(iii)1(b)(i)1(b)(ii)

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2(a)(i)2(a)(ii)2(a)(iii)2(b)

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3(a)3(b)3(c)3(d)

–/12 mks

4(a)4(b)4(c)4(d)4(e)

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–/11 mks

6(a)6(b)6(c)(i)6(c)(ii)

–/9 mks

5(a)Heart CirculationMedium2 marks

The diagrams in Figure 5.1 represent three types of circulatory system, G, H and J, found in animals.

Figure 5.1, three circulatory systems, G, H and J. G is a single loop connecting the heart directly to the body. H is a figure-of-eight circuit in which blood flows from the heart to the lungs and back to the heart, then from the heart to the body and back to the heart. J is a single loop in which blood flows from the heart to the lungs, then to the body, and back to the heart without re-entering the heart between the lungs and the body.

State which of the letters, G, H or J, in Figure 5.1 represents the circulatory system found in mammals. Give two reasons for your choice.

Letter, and two reasons for your choice

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5(b)Blood Clotting Oxygen TransportHard4 marks

In mammals, water and some dissolved substances move from the blood in capillaries into tissue fluid. Describe and explain the formation of tissue fluid in a capillary network.

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5(c)Plant Structure TransportHard5 marks

Water takes different pathways from the soil to the xylem in plants. Describe the different pathways taken by water from the soil to the xylem.

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