B7.1 - Plant Transport

Question 1

What is the function of xylem?

Answer 1

To transport water and mineral ions

Question 2

What is the function of phloem?

Answer 2

To transport sucrose

Question 3

In which direction does xylem transport?

Answer 3

Roots to leaves

Question 4

In which direction does phloem transport?

Answer 4

Source to sink

Question 5

What is the name of the transport that happens in the xylem?

Answer 5

Transpiration

Question 6

What is the name of the transport that happens in the phloem?

Answer 6

Translocation

Question 7

What is the function of root hair cells?

Answer 7

To absorb water and minerals from the soil

Question 8

Ext: Why does a root hair cell need a large surface area?

Answer 8

To increase its surface area for absorption

Question 9

Name, in order, the four parts of a plant the water passes through from soil to air

Answer 9

Root hair, root cortex cells, xylem, mesophyll cells

Question 10

Define transpiration

Answer 10

The movement of water through the xylem from roots to leaves of a plant

Question 11

Ext: Explain why water moves up the stem of a plant

Answer 11

Evaporation from the leaves creates a vacuum. Cohesion (bonds) between water molecules creates a stream

Question 12

Describe the effect of temperature on transpiration rate

Answer 12

Increase in temperature increases rate of transpiration

Question 13

Describe the effect of humidity on transpiration rate

Answer 13

Increase in humidity decreases rate of transpiration

Question 14

Ext: Explain why temperature affects transpiration rate

Answer 14

Increase in temperature increases kinetic energy of water molecules

Question 15

Ext: Explain why humidity affects transpiration rate

Answer 15

Increase in humidity reduces the concentration gradient between the leaf and the air

Question 16

Define translocation

Answer 16

Movement of sucrose from source to sink in the phloem