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 how your results should be recorded, presented and analysed in order to draw conclusions from your investigation. (3) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No:WBI1601-que-20241029 Year:2024 Question No:4(c)
Answer:
An answer that includes the following points:
- table for raw data with headings and units, with means calculated from repeats (1)
AND
- bar graph format with labelled axe (1)
- use of a t test for difference (with a bar graph showing only two different light intensities) (1)
OR
- \{line / scatter\} graph format with labelled axes (1)
- use of a correlation test (with a line graph showing more than two different light intensities) (1)
- table for raw data with headings and units, with means calculated from repeats (1)
AND
- bar graph format with labelled axe (1)
- use of a t test for difference (with a bar graph showing only two different light intensities) (1)
OR
- \{line / scatter\} graph format with labelled axes (1)
- use of a correlation test (with a line graph showing more than two different light intensities) (1)
Knowledge points:
CH5 – Energy Flow, Ecosystems and the Environment
Solution:
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