Unit 2 Topic 5 - Transport Systems In Plants

Question 1

Name the components of a leaf

Answer 1

• cuticle
• epidermis
• palisade mesophyll
• vein
• lower epidermis
• spongy mesophyll
• stomata

Question 2

What is the function of a waxy cuticle?

Answer 2

A waterproof layer to minimise water loss

Question 3

What is the function of the upper epidermis?

Answer 3

To protect the inner layers of cells, is transparent to allow light through

Question 4

What is the function of the palisade mesophyll?

Answer 4

The top layer of cells packed tightly together, contains many chloroplasts for photosynthesis

Question 5

What is the function of the spongy mesophyll?

Answer 5

Cells are arranged loosely with large air spaces between them to allow for diffusion of gases between cells

Question 6

What is the function of the leaf vein?

Answer 6

Contains the xylem and phloem, to allow sugar and water to be transported in and out of the leaf

Question 7

What is the function of the stomata?

Answer 7

Pores which are opened and closed to allow gases to move in and out

Question 8

What is the function of guard cells?

Answer 8

Found on either side of the stomata and change their shape to open or close the pore

Question 9

What is the function of the lower epidermis?

Answer 9

Contains guard cells and small pores called stomata which allow gases in or out

Question 10

What does the xylem do?

Answer 10

Transports water and minerals from roots to the leaves

Question 11

Is xylem dead tissue or living tissue?

Answer 11

Dead tissue

Question 12

What do phloem do?

Answer 12

Transports sugar to all parts of the plant

Question 13

What is the structure of a xylem?

Answer 13

Has a hollow tube and a spiral of lignin

Question 14

What is the structure of a phloem?

Answer 14

Contains sieve plates, sieve tubes, companion cells and end walls