IS_Unit7_Checkpoint 7.5_E

1(a) Plants do not carry out respiration in the daytime.

• True

• False

1(b) At night, there is a net uptake of oxygen by plants.

• True

• False

[E] 1(c) Leaf epidermis has stomata, where gas exchange takes place.

• True

• False

2(a) What is the colour of the hydrogencarbonate indicator after two hours?

• A. Red

• B. Purple

• C. Pink

• D. Yellow

2(b) Which of the following correctly explains the resulting colour of the indicator after two hours?

• A. The leaf carries out respiration only. There is only the release of carbon dioxide.

• B. The leaf carries out both photosynthesis and respiration. The rate of respiration is higher than the rate of photosynthesis. There is a net relesase of carbon dioxide.

• C. The leaf carries out both photosynthesis and respiration, The rate of photosynthesis is higher than the rate of respiration, There is a net uptake of carbon dioxide. Thus, the indicator turns purple.

• D. The leaf carries out photosynthesis only. There is only the uptake of carbon dioxide.