Aquatic plants in practicals: Cabomba, Elodea and specimen handling
Distinguish Cabomba and Elodea specimen identity from bubbling evidence, and keep sourcing, handling and disposal tied to the actual plant.
Aquatic plants can provide visible gas release during photosynthesis investigations. Cabomba and Elodea are names used in teaching examples, not interchangeable identities for any plant sold as “pondweed”. The actual specimen must be identified and suitable for the assigned investigation.
The trainer selects the plant, preparation and permitted conditions. Use the prepared plants supplied for the lesson. Collecting, cutting or importing plants needs separate instructions. We have not confirmed that Eclat uses either species.
Identify the specimen before comparing results
Record the supplied name and source, condition and amount using the method's comparison basis. A photo or the name used by a shop may not be enough to identify the species. If you do not know the species, record it as unknown. Do not label it Cabomba or Elodea without checking.
Science & Plants for Schools notes that suppliers may have difficulty identifying pondweed and gives guidance across several choices. Its UK availability restrictions are specific to that jurisdiction; they do not establish Singapore permission or prohibition.
For sourcing into Singapore, the responsible adult should use NParks' current plant-import requirements for the actual plant and shipment. The linked NParks page explains the requirements. It does not confirm approval for a particular species or seller. Students should use supplied specimens rather than collecting plants from waterways or ordering replacements independently.
Distinguish bubble frequency from gas volume
The SAPS teaching resource uses bubbling as an indication of photosynthesis and distinguishes counting bubbles from collecting a volume of gas. If bubble sizes vary, twice as many bubbles need not mean twice the gas volume.