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Sec 2 Phloem and xylem Flashcards | StudBud
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Sec 2 Phloem and xylem
Sec 2 Phloem and xylem
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#Plant #Transport and #Nutrition topics for the new #IGCSE #Biology course.
Flashcards
39 cards
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Practice quiz
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Questions
39
Answers
1
Which of these doesn't need to be controlled in a transpiration investigation?
Volume of water in the reservoir
Number of leaves
Temperature
Brightness of a bulb
2
Which factor appears to have the greatest effect on the rate of transpiration?
Wind Speed
Base
Temperature
Light Intensity
3
How can you use this apparatus to measure the rate of transpiration?
Measure the mass lost in one day
Measure the distance the bubble moved in one minute
Measure the volume of water lost from the reservoir in 1hour
Count the number of bubbles made in 30 seconds
4
Phloem transport substances:
All of the above
To new growing regions
Up plants
Down plants
5
In the low light intensity, a leaf would still turn the indicator orange because:
Photosynthesis needs high light intensities
The plant would only be respiring
The leaf would respire at a higher rate than photosynthesis
CO2 levels depend on more than light intensity
6
This is a lower epidermis of a land plant. How would the upper epidermis be different?
More cells
Fewer Nuclei
More stomata
Fewer stomata
7
Which of these is the reason plants need high concentrations of magnesium?
For making chlorophyll
For building proteins
For making DNA
For making cell walls
8
Which factor, not shown in the table, can affect the rate of transpiration?
Mineral concentration
Humidity
Temperature
9
Which of these is a feature of layer C
Have large numbers of chloroplasts for photosynthesis
Forms a barrier to micro-organisms
Regular shape for close packing to maximise light absorption
Transparent to allow light directly through
10
Multicellular Organisms such as plants require transport systems because:
Substances have to travel long distance
Active Transport would use too much energy
Their exchange surfaces are too small
11
Transpiration is a necessary evil in plants because:
It draws minerals up the xylem
Stomata must be open to absorb carbon dioxide
12
Explain why the plants transpire faster with a heater
Increases kinetic energy and evaporation of water molecules
Evaporates the boundary layer reduces diffusion distance
Stomata open as photosynthesis rate increases
Reduces the concentration of water vapour outside the leaf
13
Which of these also
does not
affect the rate of photosynthesis?
Carbon dioxide concentration
Spread of roots
Temperature
Opening of stomata
14
Which of these is an organ in plants?
Xylem
Spongy mesophyll
Chloroplast
Leaf
15
Name this apparatus
Hygrometer
Colorimeter
Chlorogram
Potometer
16
Plant cells can become plasmolysed but animal cells can't because:
Plant cells have a cell wall which withstands high pressures
They have a vacuole which stores minerals and water
Plasmolysis is the cell membrane separating from a cell wall
Animal cells lyse in high concentrations of water
17
Which of these is the upper epidermis?
C
A
B
D
18
Why do guard cells have chloroplasts?
To be camouflaged with the other leaf cells
To detect light and open the stomata in the day
To make glucose from photosynthesis
19
In a starch leaf test, area B would turn Orange because
Light can reach the leaf for photosynthesis
Glucose is converted into sucrose and moved in the phloem
A lack of chlorophyll stops light energy being converted
The lack of light stops photosynthesis taking place
20
How is a leaf adapted for gas exchange?
Cuticle is impermeable to reduce water loss
Irregularly shaped spongy mesophyll increases surface area
Large numbers of chloroplasts absorb light
Guard cells can close to conserve water
21
Which of these is the balanced chemical equation for photosynthesis?
6O2 + 6H2O → 6CO2 + C6H12O6 +
C6H12O6 + 6O2 → 6CO2 + 6H2O
6CO2 + 6H2O → C6H12O6 + O2
6CO2 + 6H2O → C6H12O6 + 6O2
22
In a starch leaf test, area A of this leaf would turn:
Blue
Orange
Brick-red
Blue-black
23
The limiting factor at point B is:
Light intensity
Carbon dioxide concentration
Temperature
24
Why is structure E often found on the upper surface of plants which float on ponds?
They need twice as much gas exchange
To allow water to evaporate from the upper surface
Gas exchange can't take place through the pond water
Guard cells need to detect light above the water surface
25
How does water enter the roots?
The soil is highly saturated with water
Active transport of minerals reduces the water concentration
Loss of water from leaves reduces the water concentration
26
A leaf in a tube covered with black card, would turn the indicator:
Orange
Yellow
Red
Purple
27
Water moves up the xylem because:
Water moves through cells in the xylem by osmosis
Water is continually lost by transpiration at leaves
Water is pumped up from the roots
Water is drawn up by gravity
28
The limiting factor at point C is:
Carbon dioxide concentration
Temperature
Light Intensity
29
Which of these is a use of active transport in plants?
Absorbing water in the root hair cells
Loss of water from leaves
Moving water up xylem
Moving minerals into root hair cells
30
Explain why the plants transpire faster with a lamp
Evaporates the boundary layer reduces diffusion distance
Reduces the concentration of water vapour outside the leaf
Stomata open as photosynthesis rate increases
Increases kinetic energy and evaporation of water molecules
31
Why do CO2 levels in a pond increase at night?
Plants stop photosynthesising
Animals start respiring
Plants are carrying out respiration
All organisms respire and plants can't photosynthesise
32
Iodine is used to show evidence of photosynthesis because:
The glucose made is stored as starch
It stops the leaf from carrying out reactions
It removes the chlorophyll from the leaves
It changes colour in the presence of glucose
33
Without
nitrates, plants would:
Have few, large leaves
Not germinate
be yellow
be shorter
34
Which of the following processes are used for moving substances in plants?
Transpiration
Diffusion
Active Transport
Osmosis
35
In a sealed tube with a leaf in bright light, hydrogen carbonate indicator would turn:
Yellow
Purple
Orange
Red
36
The limiting factor at point D is:
Tempearture
Light intensity
Carbon dioxide concentration
37
Which pair of substances are moved in the phloem?
Water and Amino acids
Sucrose & Minerals
Water & Minerals
Sucrose & amino acids
38
Why would this plant transpire less when it hasn't been watered?
There is less water for the plant to lose
There needs to be a steep water potential gradient
The xylem won't transport as much water
The guard cells will shut
39
Transpiration
doesn't
require:
Active Transport
Diffusion
Evaporation
Osmosis
