Exam-style questions
A student is investigating the effect of different wavelengths of light on photosynthesis.
They use the following equipment:
● a lamp
• coloured light filters
a metre rule
a conical flask

0.2% sodium hydrogencarbonate solution
a gas syringe
a sample of pondweed
Plan an experiment to allow the student to collect valid data.
You should identify any control variables.



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