Gas exchange in plants

Which of the following labelled arrows in the diagram show(s) the direction of oxygen diffusion between the plant and the surrounding at midnight?

• (2) only

• (3) only

• (1) and (3) only

• (2) and (3) only

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

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.

• (3) -> (1) -> (4) -> (2)

• (4) -> (2) -> (3) -> (1)

• (3) -> (4) -> (1) -> (2)

• (4) -> (3) -> (1) -> (2)

Tags

NGSS.MS-LS1-6

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

• (2) and (4) only

• (1), (2) and (4) only

• (2), (3) and (4) only

• (1), (2), (3) and (4)

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-6

Which of the following combinations of the features of the leaves of terrestrial (land) plants and their adaptations for gas exchange is not correct?

• broad and flat to provide a large surface area

• moist surface of the mesophyll cells to allow gases to dissolve in the moisture

• epidermis not covered by cuticle to allow gases to diffuse freely

• many stomata to allow gases to pass into and out of the leaves freely

What causes the stoma to open?

• Leaves placed in dark areas.
• Water moving into the guard cells.
• Leaves that are suffering in a drought.
• Water moving out of the guard cells.

Tags

NGSS.MS-LS1-2

Most stomata are usually found in underside of leaves.  Why?

• conserve water
• get more CO2
• prevent infection
• none

Tags

NGSS.MS-LS1-5

Most chloroplast are found in the

• palisade mesophyll
• spongy mesophyll
• epidermis
• xylem

guard cells change shape and open the stomata as they become

• flacid
• turgid
• larger
• smaller

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

• B.
• A.
• D.
• C.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

The leaf has a shiny, waxy cuticle around it to

• increase the rate of photosynthesis

• attract more light

• control water loss

• stop carbon dioxide and oxygen gases escaping