Transpiration

Transpiration allows the plant to absorb water from the air, through the process of transpirational pull. 

• True

• False

• no idea

Which of the following is not a reason why transpiration is important?

• • It is needed for transpirational pull.

• • It helps maintain turigidity in young plants or plants without woody stems to provide them with structural support.

• • It allows for the cooling of the plant.

• It allows plants to anchor themselves in the soil via their roots.

There is a close relationship between transpiration and leaf structure and different environmental conditions trigger some of the leaf structures influencing transpiration.

• True

• False

• no idea

Waxy _______ on the surface of a leaf prevent water loss. This means that there is a reduced rate of transpiration. 

Which one of the following is not an adaptation to the structure of a leaf that influences transpiration?

• • The stomata.

• • Presence of hairs.

• Leaves being in direct sunlight during the daytime. 

• • Arrangement of the leaves.

When the humidity is high, in other words, when there is a lot of water vapour in the air, the water potential gradient between the inside of the leaf and the atmosphere is shallow (basically not a big difference in water content between the inside and outside of the leaf). In this situation, the rate of transpiration will be low.

• True

• False

• No clue

Which of the following is a structural adaptation that plants use to reduce the rate of transpiration?

• • Thinner cuticle

• Leaf spines

• • Increase in leaf size

• • Leaves having no hair

Guttation occurs when water availability is low. This can be because of several reasons such as drought, low temperatures or high salinity (salt concentration).

• True

• False

• no idea

Water and mineral salts, found in the spaces between the soil particles enter the root through the cell wall and cell membrane of the root hair cells, by _______.

You will recall that there are three processes involved in or required for the transport of water in plants. These processes, more impressively, are passive meaning that they do not require any energy input. Which of the following is not one of these three processes?

• • Root pressure.

• • Transpirational pull.

• • Capillary action.

• Guttation.