[PPQs] Rate of Photosynthesis

• Q6 (a) (i) What was the independent variable in the investigation?

  Colour of the light bulb

  
• Q6 (a) (ii) To make the investigation fair the pupils needed to control some variables.

  Suggest one variable that the pupils should have controlled during their investigation.

  size of pondweed

  
• Q6 (a) (iii) It is better to count the bubbles every minute for three minutes than to count all the bubbles in three minutes.

  Why?

  It's a more accurate reading

  
• Q6 (b) (i) What would be the best colour of light bulb to illuminate the fish tank to reduce the growth of algae?

  Green