Internal Structure of a leaf

Question 1

What is transpiration

Answer 1

Transpiration is the loss of water vapour (by evaporation) from the surface of the leaf.

Question 2

What is translocation

Answer 2

the movement of dissolved sugars from the leaves (where they are made) to the rest of the plant.

Question 3

What is the Xylem

Answer 3

is a plant tissue which transports water and mineral ions from the roots to the stems and leaves. It is composed of hollow tubes strengthened by lignin.

Question 4

What is the Phloem

Answer 4

is a plant tissue which transports dissolved sugars from the leaves to the rest of the plant. The plant can either use the sugars immediately or store them (as starch)

Question 5

What are stomata

Answer 5

They are tiny pores on the surfaces of leaves, which can open or close

Question 6

What are Guard cells

Answer 6

They surround the stomata and control the opening and closing of the stomata. They allow the exchange of gases in and out of the leave

Question 7

Where are the most stomata found?

Answer 7

On the lower surface on the leaf

Question 8

How do mineral ions enter the plant?

Answer 8

Mineral ions are dissolved in water in low concentrations.Therefore the mineral ions enter the plant via the root hair cells by active transport.

Question 9

What conditions cause stomata to open

Answer 9

• Stomata open during the day and close during the night.
• High water potential outside the stomata
• Light causes stomata to open