Gas exchange in plants

Front

Direction of oxygen diffusion between the plant and the surrounding at midnight (refer to diagram with labelled arrows).

Back

Arrows (2) and (3) only

Front

Arrange the following statements in the correct order to show how oxygen gas is produced in the leaf and then enters the atmosphere: (1) Oxygen passes through the stomata. (2) Oxygen diffuses from the mesophyll cells to the water film. (3) Oxygen diffuses from the water film to the air space. (4) Oxygen is released from the mesophyll cells.

Back

(4) -> (2) -> (3) -> (1)

Front

Which of the cells absorb carbon dioxide when the plant is under bright sunlight?

Back

Cells (2), (3), and (4) absorb carbon dioxide under bright sunlight.

Front

Which combination of leaf features and adaptations for gas exchange is incorrect? Options: broad and flat for large surface area, moist mesophyll for gas dissolution, epidermis without cuticle for free diffusion, many stomata for gas exchange.

Back

epidermis not covered by cuticle to allow gases to diffuse freely

Front

What causes the stoma to open?

Back

Water moving into the guard cells.

Front

Why are most stomata usually found on the underside of leaves?

Back

conserve water

Front

Where are most chloroplasts found? Options: palisade mesophyll, spongy mesophyll, epidermis, xylem

Back

palisade mesophyll

Front

Guard cells change shape and open the stomata as they become:

Back

turgid

Front

Which graph represents the effect of light intensity on the rate of photosynthesis?

Back

Graph A

Front

The leaf has a shiny, waxy cuticle around it to

Back

control water loss