PHOTOSYNTHESIS(4): Practical

Question 1

What plant do you use when investigating a photosynthesising water plant?

Answer 1

ELODEA (pondweed)

Question 2

As photosynthesis occurs what gas is released?

Answer 2

Oxygen

Question 3

How can you see the oxygen produce in the experiment

Answer 3

The oxygen that the pond weed releases can be seen as bubbles leaving the CUT END of pond weed

–)the more bubbles per minute=the faster the rate of photosynthesis

Question 4

What would be a more accurate version of this experiment?

Answer 4

collect the oxygen released in a test tube that is inverted over the top of the pond weed

over a long period of time

measure the volume of water collected

Question 5

What can this practical be used to investigate?

Answer 5

This practical can be used to investigate the effect of changing light intensity.

(by moving a lamp different distances away from the beaker containing the pondweed)

or
changing carbon dioxide concentration

(by dissolving different amounts of
SODIUM HYDROGEN CARBONATE in the water in the beaker)