test for whether carbon dioxide is needed for photosynthesis

Question 1

1.

Answer 1

destarch 2 potted plants

Question 2

2.

Answer 2

enclose the pots in polythene bags and secure the bags to the plant stems

Question 3

3.

Answer 3

place one of the potted plants in a bell jar that contains a petri dish with potassium hydroxide solution and cover the bell jar with soda lime. leave the set up under strong sunlight for 1-2 hours

THIS SET UP DOES NOT HAVE ANY CO2 IN THE AIR BC KOH AND SODA LIME ABSORBS CO2!

Question 4

4.

Answer 4

set up a control using pebbles and water in place of the soda lime and KOH and leave it under strong sunlight for 1-2 hours as well

Question 5

5.

Answer 5

remove a leaf from each plant and test it for starch