Chapter 11 Quiz 1

The water absorbed by plants is mostly used in photosynthesis.

• True

• False

Transpiration occurs mainly through the leaf stomata.

• True

• False

Water vapours move out of the stomata in plants by osmosis.

• True

• False

Transpiration pull helps transport the sugars stored in the roots up to the leaves.

• True

• False

The higher the density of stomata in the leaves, the higher is the transpiration rate of the plant.

• True

• False

The upper epidermis of water lily has fewer stomata than the lower epidermis.

• True

• False

The graph shows the effect of environmental factor X on the transpiration rate of a plant.

What can environmental factor X probably be?

• temperature

• light intensity

• relative humidity

• air movement

The graph shows the effect of environmental factor X on the transpiration rate of a plant.

Fill in the blanks with suitable words to explain how environmental factor X affects the transpiration rate of the plant.

Effect:

The transpiration rate of the plant (i)______________ with an increase in the magnitude of environmental factor X.

Explanation:

A higher magnitude of environmental factor X (ii)______________ the concentration gradient of water vapour between the air spaces in the leaves and the surrounding air. Thus, water vapour will diffuse out of the leaves more (iii)______________.

• (a) increases；(b) increases；(c) rapidly

• (a) increases；(b) reduces；(c) rapidly

• (a) decreases；(b) increases；(c) slowly

• (a) decreases；(b) reduces；(c) slowly