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Biology

CAIE2022

Corals grow in shallow sea water. Corals consist of colonies of small animals called polyps. These polyps have photosynthetic protoctists called algae within their cells, which is advantageous both to the coral polyps and to the algae. The algae that live within the cells of coral polyps can also live independently as free- living algae. ( a) The rate of photosynthesis of algae that live within the cells of coral polyps is higher than that of free- living algae. Suggest and explain why the rate of photosynthesis in algae that live within the cells of coral polyps is higher than that of free- living algae. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [3 ] © UCLES 2019 97 00/04/SP/22 PMT

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