The photograph shows the pondweed Elodea canadensis. (Source: © Dorling Kindersley Ltd / Alamy Stock Photo) This plant grows in ponds and rivers throughout North America. A student read that pondweed grows fastest near the water surface. The student formed the following hypothesis: The further away from the water surface the lower the rate of photosynthesis as less light can be absorbed by the pondweed. Plan a laboratory investigation that can be carried out to find evidence to support or reject this hypothesis. Your answer should give details under the following headings. Suggest two limitations of your proposed method. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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