4.4.1 - Transport tissues in plants

Question 1

What is the cambium?

Answer 1

A layer of unspecialised cells that divide to give specialised cells such as the xylem and phloem.

Question 2

What are the 3 main types of tissue in plants?

Answer 2

Parenchyma tissue
Collenchyma tissue
Scelerenchyma tissue

Question 3

Functions of the Parenchyma tissue?

Answer 3

Photosynthesis (found in leaf)
Storing water
Gas exchange

Question 4

Functions of the Collenchyma tissue?

Answer 4

Mechanical support
Elasticity

Question 5

Functions of the Scelerenchyma tissue?

Answer 5

Mecnahnical support

Question 6

Features of the Parenchyma tissue?

Answer 6

Thin cellulose wall

Question 7

Features of the Collenchyma tissue?

Answer 7

Thin pectin and cellulose wall

Question 8

Features of the Scelerenchyma tissue?

Answer 8

Thick, lignified cell wall
Non living

Question 9

What is the start of xylem and what does it do?

Answer 9

The protoxylem - it can grow and stretch because walls aren’t lignified

Question 10

What happens as the xylem grows?

Answer 10

Walls become impermeable to water as more lignin forms.

Question 11

What is the lignified xylem tissue known as?

Answer 11

Metaxylem

Question 12

How is xylem formed?

Answer 12

Cells arranged on top of each other.
Cells enlarge as vacuoles take in water.
Development of transverse plate.
Transverse plate breaks down (in between cells)
Lignin is deposited in cellulose cell wall

Question 13

How can the transportation of water in xylem be proven by a cut of a flower?

Answer 13

Place the cut end of the flower in dyed water, the petals of the flower will turn the colour of the dye.

Question 14

How can the transportation of water in xylem be proven by using a plastic bag?

Answer 14

If you place a plastic bag over the leaves of a flower, condensation will appear on the bag due to transpiration.

Question 15

Features/ functions of the phloem?

Answer 15

Made up of living tissues
Transports sucrose from leaves to other parts of the plant (sink) for respiration
Movement is up and down

Question 16

Structure of the phloem tissue?

Answer 16

Sieve tubes join together
Sieve plates allow contents to pass through
No nuclei as they are associated with companion cells

Question 17

What joins the sieve tubes and companion cell?

Answer 17

Plasmodesmata

Question 18

What is significant about the membranes of companion cells?

Answer 18

Have infoldings to increase surface area

Question 19

What do companion cells contain that is improtant?

Answer 19

Many mitochondria to supply ATP for active transport.