CAIE IGCSE Biology 12.1.1 Uses of Energy in Living Organisms

Practise selecting biological processes that use energy released by respiration in animals and plants.

Exam points

select muscle contraction, protein synthesis, cell division, active transport and growth as energy uses
include nerve-impulse transmission and maintenance of constant body temperature where relevant
exclude diffusion, osmosis and transpiration because these passive processes are not powered by respiration

[Maximum number: 3]

Fig. 6.1 shows some cells from the shoot tip of an onion, Allium cepa.

Fig. 6.1

The area labelled M is a mitochondrion.

Explain why mitochondria have an important role in dividing cells.

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