Transport In Plants

Question 1

Uptake and transport of water and minerals

Answer 1

Osmosis-absorption of water into root hairs as cytoplasm is more concentrated than the water in the cell
Cell to cell through cytoplasm and vacuole
Diffusion-through the spaces between the cell walls

Question 2

Cohesion tension model

Answer 2

Transpiration draws water up the xylem
Cohesion:h2o molecules attracted to one another
Adhesion:h2o molecules attracted to walls
Constant transpiration pull from leaves allows for constant flow of water from root to xylem

Question 3

Transpiration

Answer 3

Loss of water vapour from leaves
Takes place in stomata
Water evaporates from the cells of the leaf
Diffuses into the atmosphere through the stomata
The leaf cells become less swollen and less turgid
Water passes from the xylem into the cells due to an osmotic gradient

Question 4

Guard cells

Answer 4

Control the opening and closing of the stomata

Controlled by co2

Question 5

Role of minerals

Answer 5

Calcium-formation of cell walls

Magnesium-formation of chlorophyll

Question 6

Sources of co2

Answer 6

Atmosphere

Produced in leaf by respiration

Question 7

Modified plant root

Answer 7

Tap root- carrot

Question 8

Modified plant stem

Answer 8

Underground stem- potato

Question 9

Modified plant leaf

Answer 9

Bulb-onion

Question 10

Gas exchange in leaf

Answer 10

Co2 diffuses from atmosphere into leaves

Co2 diffuses to the ground tissue through the air spaces between cells

Question 11

Gas exchange in stems

Answer 11

Lenticles
Oxygen in
Co2 and water vapour out

Question 12

Role of co2 in stomata

Answer 12

High concentration of co2-stomata close

Low concentration of co2-stomata open