Volvox
Immobilised algae
Immobilised algae for studying photosynthesis
Summary
Students immobilise algae in calcium alginate, then use the entrapped cells to study photosynthesis by placing them in hydrogencarbonate indicator solution and observing the colour change as the carbon dioxide is depleted.
Educational objectives
This protocol provides a semi-quantitative introduction to photosynthesis.
Pre-knowledge and skills required by students
Basic understanding of the biochemistry of photosynthesis. Knowledge of pH scale and the use of indicators.
Time taken in lesson
50 minutes
Preparation time
50 minutes
Specialist equipment and materials required
Sodium alginate; Hydrogencarbonate indicator; Culture of algae. A colorimeter is useful, but not essential.
Context where originally used
Used with students aged 14–16. Also suitable for older students, particularly if open-ended investigations are undertaken.
Additional information
Sodium alginate is available from suppliers of laboratory chemicals (it is also widely used in the food industry). Suppliers of other resources are listed in the protocol. The NCBE will soon supply a kit for undertaking this work. Similar arrangements may exist in other countries.
Author
Debbie Eldridge (Science and Plants for Schools)
Author address
Please contact:
NCBE
University of Reading
2 Earley Gate
Reading
RG6 6AU
Copyright HOLDER(s)
Copyright © NCBE, University of Reading, 2008
COPYRIGHT TERMS
 Attribution required
 No derivative works
 No endorsement
 Share and share alike
 No commercial use without permission
 No practical kits without permission
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