LEAF STRUCTURE AND FUNCTION

K, L, M, N and O are some of the internal structures of a leaf.

K - Guard cell

L - Companion cell

M - Lower epidermis cell

N - Spongy mesophyll cell

O - Palisade mesophyll cell

Which structures can carry out photosynthesis?

• K, L, M and N

• K, L, N and O

• K, M, N and O

• K, L, M and O

Which of the following statements about respiration in plants is true?

• Respiration occurs only in the daytime

• Only green plants carry out respiration

• Cellular respiration involves oxidation of food

• Respiration occurs only at night

Diagram shows a pair of guard cells and the stoma.

Which parts labelled A, B, C or D is responsible for the opening and closing of the stoma?

• A

• B

• C

• D

What is the purpose of plucking the leaves from a seedling before transferring it from the nursery to an orchard?

• To reduce the rate of respiration

• To reduce the rate of photosynthesis

• To reduce the rate of water absorption

• To reduce the rate of transpiration

Which of the following is produced during the light-dependent reaction of photosynthesis?

• ATP

• Oxygen

• Glucose

• Carbon dioxide

The graph shows the effect of light intensity on the rate of photosynthesis.

What can be concluded about the rate of photosynthesis for curves J and K?

• It is not influenced by the concentration of carbon dioxide

• It is limited by the concentration of carbon dioxide

• It is limited by the light intensity

• It is not influenced by the temperature

Which of the following refers to compensation point?

• The rate of respiration is lower than the rate of photosynthesis

• The rate of respiration is higher than the rate of photosynthesis

• The rate of respiration is the same as the rate of photosynthesis

• The rate of respiration increases and the rate of photosynthesis does not change