Topic 6 Flashcards

1
Q

Function of root hair cell

A

Allow the plant to absorb water

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2
Q

Root hair cell beneficial characteristics

A

Long projections that increase the surface are that the plant can use to absorb water and minerals

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3
Q

What don’t root hair cells contain

A

Chloroplast. Underground so no light for photosynthesis

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4
Q

Function of xylem cell

A

Transports water up the stem of a plant and into the leaves

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5
Q

What does lignin do

A

Strengthens the cell walls of xylem cells

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6
Q

What does stomata do

A

Make diffusion of gasses easier in leaves

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7
Q

What opens and closes the stomata

A

Guard cells

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8
Q

How do the guard cells close the stomata

A

They lose water and return to a limp state

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9
Q

How do the guard cells open up the stomata

A

Taking up lots of water causing them to swell

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10
Q

What happens with a lack of water

A

Stomata closes in order to prevent further water loss by guard cells returning to limp state

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11
Q

What does time of day have to do with stomata

A

Stomata closes at night as in the absence of sunlight, carbon dioxide is not required for photosynthesis

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12
Q

What does transpiration do

A

It transports water and the minerals dissolved in it through the plant

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13
Q

Direction of water

A

From the roots to the leaves

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14
Q

What process is used for root hair cells to absorb water from the soil

A

Osmosis

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15
Q

What happens once water reaches the leaves

A

Water evaporates and the water vapour diffuses out through open stomata
This loss of water is called transpiration

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16
Q

What affects rate of transpiration

A

Humidity
Air flow
Light intensity
Temperature

17
Q

How does humidity affect rate of transpiration

A

Increased humidity increases amount of water in the air so harder for water to evaporate
Decreases rate of transpiration

18
Q

How does air flow affect rate of transpiration

A

Increased air flow carries water away from the plants leaves so more water evaporates
Increased airflow means increase rate of transpiration

19
Q

How does light intensity affect rate of transpiration

A

Increased light intensity makes water evaporate faster so increases rate of transpiration

20
Q

How foes temperature affect rate of transpiration

A

Increase temperature makes water evaporate faster so increases the rate of transpiration

21
Q

What apparatus is used to calculate rate of transpiration

A

Potometer

22
Q

What do auxins do (plant hormones)

A

Change growth patterns to allow roots and shoots to move either towards or away from a stimulus

23
Q

What do gibberellins do

A

Start of seed germination process

24
Q

What does ethene do

A

Controls cell division

25
Q

What do auxins control

A

Tropisms

26
Q

Tropisms can be split into -

A

Positive phototropism
Negative phototropism
Positive gravitropism
Negative gravitropism

27
Q

What do positive phototropism do

A

Growth towards a light source

28
Q

What do negative phototropism do

A

Growth away from a light source

29
Q

Different function of auxins In different part of plant

A

In roots auxins prevent elongation of cells

In shoots auxins promote elongation of cells