Gas Exchange in Plants

Question 1

Stoma

Answer 1

Allow gas exchange between inside and outside of leaf

Question 2

Guard cells

Answer 2

Can change their shape to open or close stomata

Question 3

What is the colour of hydrogen carbonate indication in high concentrations of carbon dioxide >0.4%?

Answer 3

Yellow

Question 4

What is the colour of hydrogen carbonate indication in normal concentrations of carbon dioxide =0.4%?

Answer 4

Orange

Question 5

What is the colour of hydrogen carbonate indication in low concentrations of carbon dioxide <0.4%?

Answer 5

Purple

Question 6

Describe an experiment to measure the effects of limiting factors upon the rate of photosynthesis

Answer 6

1. Place 10cm cubed of hydrogen carbonate indicator solution into a test tube
2. Place a leaf in each tube then each tube, bunged, in different conditions (no leaf in control)
3. Leave for a few hours then observe indicator colour