Mas Transport In Plants

Question 1

What conditions affect water inside plants

Answer 1

Temperature
Light intensity
Humidity
Wind

Question 2

What occurs to the stomata when the temperature is to high

Answer 2

Water gains kinetic energy
So evaporates at faster rate

Question 3

What affect does humidity have on the opening of the stomata

Answer 3

Lots of water vapour
So WP m is formed and is greater outside
So reduces the m

Question 4

What is meant by transpiration

Answer 4

Loss of water vapour from the stomata by evaporation

Question 5

What happens when water vapour evaporates out of the stomata of leaves

Answer 5

Decreases the volume and pressure

Question 6

What happens when transpiration occurs

Answer 6

Water potential gradient is formed.
More water if forced to replace it upwards

Question 7

What happens to the roots when transpiration occurs

Answer 7

Volume of water increases
So does pressure

Question 8

Why is the roots under negative pressure/tension

Answer 8

When water is pulled up the xylem/water column

Question 9

Why can the water molecules stick together

Answer 9

Because they are bonded by hydrogen bonds

Question 10

How is a column of water created in the xylem

Answer 10

When there is cohesion between the water molecules
Cause if the hydrogen bonds

Question 11

What do the water molecules adhere to

Answer 11

Walls of the xylem

Question 12

Why do the water molecules adhere to the xylem

Answer 12

Helps to pull water column upwards

Question 13

Why does the xylem get narrow

Answer 13

When the water is pulled through the xylem

Question 14

What is the xylem made up of

Answer 14

Dead cells
Lignin
Hollow

Question 15

What is the role of translocation

Answer 15

The movement of sucrose and amino acids in a plant

Question 16

Where is the sucrose made from during translocation

Answer 16

Respiration

Question 17

What is found in the companion cell

Answer 17

H+ ions

Question 18

What is the phloem made of

Answer 18

Sieve tube elements
Companion cells

Question 19

What is an adaptation of companion cells

Answer 19

Have many mitochondria
Provides ATP for active transport

Question 20

What are sieve tube elements made from

Answer 20

Living cells
No nucleus

Question 21

Why also sieve tube elements have fewer organelles

Answer 21

For maximum flow

Question 22

What is the movement of sucrose from the SOURCE into thé companion cell

Answer 22

High in source low in companion cell
Moves down gradient
Via facilitated diffusion into companion cell

Question 23

What mode of transport does sucrose take from the source

Answer 23

Facilitated diffuse

Question 24

Where is sucrose made

Answer 24

Photosynthesis

Question 25

What is the movement of the hydrogen ions from the companion cell to the plasmodesmata

Answer 25

Active transport Using ATP Low concentration in companion cell compared to outside

Question 26

What direction do the H+ ions move when they enter the plasmodesmata

Answer 26

Down concentration gradient Via carrier protein

Question 27

What allows the H+ ions to move from the plasmodesmata to the sieve tube elements

Answer 27

Carrier proteins

Question 28

Where do we see the action of a Co transport protein

Answer 28

Sucrose and the H+ ion Which transports sucrose into sieve tube elements

Question 29

What allows the transport of of sucrose into the sieve tube elements

Answer 29

Co transport protein

Question 30

What does an increase of sucrose in the sieve tube elements do to the water potential

Answer 30

Decreases

Question 31

What decreases the water potential in the sieve tube

Answer 31

When there is an increase in sucrose

Question 32

Where does the water come from when the water potential is reduced cause if the sucrose

Answer 32

Xylem vessels via osmosis

Question 33

What does an increase in the water volume mean in the sieve tube elements

Answer 33

Increases the hydrostatic pressure So it is forced down the sink

Question 34

What does the high hydrostatic pressure do

Answer 34

Forces water down sink

Question 35

What occurs in the sink cell

Answer 35

Respiration

Question 36

What is the movement of sucrose when it wants to enter the sink cell

Answer 36

Active transport

Question 37

What happens to the water potential when sucrose transports in via active transport

Answer 37

It decreases

Question 38

A decrease in the water potential of the sink cell causes what happen

Answer 38

Movement of water via osmosis from sieve tube elements into sink cell

Question 39

What happens when the volume decreases towards the sink cell

Answer 39

Hydrostatic pressure decreases

Question 40

What encourages the movement of soluble organic substance to move

Answer 40

Difference in the hydrostatic pressure