IB Biology SL B3.2 Transport Questions

Practise IB Biology SL B3.2 by linking vessel and plant transport structures to pressure, exchange, mass flow and distribution.

Exam points

compare artery, vein and capillary structure with pressure, return flow and exchange functions
explain cohesion-tension and xylem adaptations that maintain water transport from roots to leaves
identify xylem, phloem and vascular-bundle positions in stem or root diagrams

[Maximum number: 3]

Explain how the structure of capillaries relates to their functions.

[Maximum number: 1]

The diagram shows a cross section through an artery and a vein.

Identify which of the two labelled blood vessels is the artery, giving a reason for your answer.

[Maximum number: 3]

This micrograph shows a transverse section of an artery.

x100

Explain how the specialized structures of arteries help them to achieve their functions.

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a	arteries carry blood at high pressure;
b	rupture of arteries is prevented by thick muscular/elastic walls;
c	narrow lumen to maintain a high blood pressure;
d	elastic tissue allows artery to stretch and recoil (to even out pressures);
e	arteries have muscle layers which contract to increase/control the blood flow;
f	folding in the endothelium allows stretching OR smooth endothelium reduces friction;

a	X as it has muscular/thicker walls;
b	X as it has a smaller lumen (than Y);