A-level set practicals: factors affecting rates of photosynthesis

5
0
4
0
3
0
2
0
1
0
0
Rate this resource

This updated version of the SAPS algal balls resource is designed to support the use of practicals across 2015 A-level biology specifications.

Students measure the rate of photosynthesis in comparison to the rate of respiration. Because of this, it is possible to determine the light intensity at which the photosynthesising material is using the same quantity of carbon dioxide in photosynthesis as it is producing in respiration (the light compensation point).

This practical provides the opportunity for skills development in

  • the use of appropriate instrumentation (a colorimeter) to record quantitative measurements
  • the safe and ethical use of organisms to measure plant responses to changing conditions
  • the use of computer modelling, or a data logger to collect data, or the use of software to process data
  • immobilisation of organic material (in this case algae but the technique is often used for enzymes as well)
  • the use of a smart phone as a lux meter (optional)
  • graphical skills (including plotting graphs with lines of best fit and reading off intercept points).

Show health and safety information

Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.

Published by

Actions

Share this resource

Lists that tag this content