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biology :} > Mas Transport In Plants > Flashcards

Mas Transport In Plants Flashcards

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1
Q

What conditions affect water inside plants

A

Temperature
Light intensity
Humidity
Wind

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2
Q

What occurs to the stomata when the temperature is to high

A

Water gains kinetic energy
So evaporates at faster rate

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3
Q

What affect does humidity have on the opening of the stomata

A

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

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4
Q

What is meant by transpiration

A

Loss of water vapour from the stomata by evaporation

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5
Q

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

A

Decreases the volume and pressure

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6
Q

What happens when transpiration occurs

A

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

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7
Q

What happens to the roots when transpiration occurs

A

Volume of water increases
So does pressure

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8
Q

Why is the roots under negative pressure/tension

A

When water is pulled up the xylem/water column

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9
Q

Why can the water molecules stick together

A

Because they are bonded by hydrogen bonds

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10
Q

How is a column of water created in the xylem

A

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

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11
Q

What do the water molecules adhere to

A

Walls of the xylem

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12
Q

Why do the water molecules adhere to the xylem

A

Helps to pull water column upwards

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13
Q

Why does the xylem get narrow

A

When the water is pulled through the xylem

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14
Q

What is the xylem made up of

A

Dead cells
Lignin
Hollow

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15
Q

What is the role of translocation

A

The movement of sucrose and amino acids in a plant

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16
Q

Where is the sucrose made from during translocation

A

Respiration

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17
Q

What is found in the companion cell

A

H+ ions

18
Q

What is the phloem made of

A

Sieve tube elements
Companion cells

19
Q

What is an adaptation of companion cells

A

Have many mitochondria
Provides ATP for active transport

20
Q

What are sieve tube elements made from

A

Living cells
No nucleus

21
Q

Why also sieve tube elements have fewer organelles

A

For maximum flow

22
Q

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

A

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

23
Q

What mode of transport does sucrose take from the source

A

Facilitated diffuse

24
Q

Where is sucrose made

A

Photosynthesis

25
Q

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

A

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

26
Q

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

A

Down concentration gradient
Via carrier protein

27
Q

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

A

Carrier proteins

28
Q

Where do we see the action of a Co transport protein

A

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

29
Q

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

A

Co transport protein

30
Q

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

A

Decreases

31
Q

What decreases the water potential in the sieve tube

A

When there is an increase in sucrose

32
Q

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

A

Xylem vessels via osmosis

33
Q

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

A

Increases the hydrostatic pressure
So it is forced down the sink

34
Q

What does the high hydrostatic pressure do

A

Forces water down sink

35
Q

What occurs in the sink cell

A

Respiration

36
Q

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

A

Active transport

37
Q

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

A

It decreases

38
Q

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

A

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

39
Q

What happens when the volume decreases towards the sink cell

A

Hydrostatic pressure decreases

40
Q

What encourages the movement of soluble organic substance to move

A

Difference in the hydrostatic pressure

biology :} (12 decks)

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