Unit 2 Transport Systems - Plants

Question 1

What re plant organs ?

Answer 1

Roots, stems and leaves

Question 2

Explain water transport.

Answer 2

Water and minerals enter the plant through the root hairs and are transported in dead xylem vessels

Question 3

Explain the structure of xylem vessels.

Answer 3

Xylem is supported by rings of lignin to withstand changes in pressure as water moves up the plant. As xylem cells mature, they die and their end walls disappear to form a continuous tube like a straw.

Question 4

What process allowed water to pass through the root hair cells into the xylem.

Answer 4

Osmosis

Question 5

What is transpiration?

Answer 5

Process of water moving through a plant and it’s evaporation through the stomata.

Question 6

What factors will increase the rate of transpiration?

Answer 6

Increased temp
Increased wind speed

Increase in light intensity
Decrease in humidity

Question 7

Explain phloem.

Answer 7

Food is produced in the leaves during photosynthesis. It must be transported all around the plant in phloem vessels to provide energy for growth and repair. Unlike xylem cells, phloem cells must be alive for them to transport sugar.
Phloem consistes of a sieve tube , a sieve plate and a companion cell.

Question 8

What structure and processes are involved as water moves through the plant form the soil to the air?

Answer 8

Root hair cells take water from the soil by osmosis, the water moves through the cells until it gets to the xylem which takes that water to the leaves where it is used for photosynthesis. Finally it is evaporated from the pores in the leaves by transpiration.