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. Describe the preliminary practical work that you might undertake to ensure your proposed method would provide quantitative results. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No:WBI1601-que-20241029 Year:2024 Question No:4(a)
Answer:
A description that includes two of the following points:
- find a suitable\{mass / length\} of pondweed (1)
- find a suitable temperature/pH (for photosynthesis) (1)
- find suitable method to measure the \{oxygen / gas\} production (1)
- find suitable depth(s) of water or light intensity (1)
- find a suitable method to change depth of water or light intensity (1)
- find a suitable\{mass / length\} of pondweed (1)
- find a suitable temperature/pH (for photosynthesis) (1)
- find suitable method to measure the \{oxygen / gas\} production (1)
- find suitable depth(s) of water or light intensity (1)
- find a suitable method to change depth of water or light intensity (1)
Knowledge points:
CH5 – Energy Flow, Ecosystems and the Environment
Solution:
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