Transport In Plants And Transpiration

Question 1

4 factors impacting transpiration

Answer 1

Temperature
Wind
Humidity
Light

Question 2

How does light impact the rate of transpiration

Answer 2

Increases rate
More photosynthesis - more water used up
Open stomata - water evaporates out
Higher concentration gradient = more diffusion

Question 3

How does temperature affect the rate of transpiration

Answer 3

Increases
Water evaporates out - changes state
Higher concentration gradient

Question 4

How does Humidity impact the rate of transpiration

Answer 4

Decreases
More water in the air
Lower concentration gradient
Less diffusion

Question 5

How does wind impact the rate of transpiration

Answer 5

Increases
Water vapour in air blown away from leaf
Higher concentration gradient
More diffusion

Question 6

Transpiration definition

Answer 6

Evaporation of water from the leaf

Question 7

Position of the xylem and phloem in the stem

Answer 7

Xylem inside
Phloem outside
Near the edge of the stem

Question 8

Position of xylem and phloem in the root

Answer 8

In centre of the root
Xylem shaped like a cross in the middle
Phloem surrounding

Question 9

How does the xylem transport water and mineral ions from the roots to other parts of the plant?

Answer 9

High concentration of water at the roots and low concentration at the leaves, high concentration gradient, water diffuses upwards
End cells are removed to allow water to pass through
Made up of dead cells to not respire

Question 10

Role of the xylem in transporting water and mineral ions from the roots

Answer 10

1. Water enters root hair cells through osmosis (low conc in roots)
2. Mineral ions taken up from the soil by active transport
3. Water and dissolved ions move upward through hollow tubes supported by lignin to withstand water pressure
4. Low water conc in leaves causes upwards motion
5. No water left in roots causes cycle

Question 11

Role of the phloem in moving sucrose and amino acids between the leaves and other organs

Answer 11

Sieve plates in phloem allow sugars to pass through
Companion cells respire to produce ATP for active transport
1. Sugars moved to roots from leaves for storage
2. Sugars released from storage in the roots to respiring tissue

Question 12

How is water absorbed by root hair cells

Answer 12

Osmosis
High water conc in soil
Low water conc in root hair cells
Water moves long concentration gradient