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Edexcel IGCSE Biology 9-1 Plants Flashcards | StudBud
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Edexcel IGCSE Biology 9-1 Plants
Edexcel IGCSE Biology 9-1 Plants
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#Plant #Transport and #Nutrition topics for the new #IGCSE #Biology course.
Flashcards
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Questions
45
Answers
1
In a starch leaf test, area B would turn Orange because
A lack of chlorophyll stops light energy being converted
Glucose is converted into sucrose and moved in the phloem
Light can reach the leaf for photosynthesis
The lack of light stops photosynthesis taking place
2
Which of these also
does not
affect the rate of photosynthesis?
Spread of roots
Carbon dioxide concentration
Temperature
Opening of stomata
3
Explain why the plants transpire faster with a heater
Evaporates the boundary layer reduces diffusion distance
Increases kinetic energy and evaporation of water molecules
Stomata open as photosynthesis rate increases
Reduces the concentration of water vapour outside the leaf
4
Why do CO2 levels in a pond increase at night?
Plants stop photosynthesising
Plants are carrying out respiration
All organisms respire and plants can't photosynthesise
Animals start respiring
5
Why would this plant transpire less when it hasn't been watered?
The xylem won't transport as much water
The guard cells will shut
There needs to be a steep water potential gradient
There is less water for the plant to lose
6
Which is
not
a reason for these algae using diffusion to move substances into and out of cells?
They have low levels of activity
They are small so have a small surface area
They have a large surface area: volume ratio
They are small so there is a short diffusion distance
7
Transpiration
doesn't
require:
Osmosis
Diffusion
Active Transport
Evaporation
8
Why is structure E often found on the upper surface of plants which float on ponds?
They need twice as much gas exchange
Gas exchange can't take place through the pond water
Guard cells need to detect light above the water surface
To allow water to evaporate from the upper surface
9
Which of these doesn't need to be controlled in a transpiration investigation?
Brightness of a bulb
Number of leaves
Volume of water in the reservoir
Temperature
10
Which of these is a use of active transport in plants?
Moving minerals into root hair cells
Loss of water from leaves
Absorbing water in the root hair cells
Moving water up xylem
11
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
CO2 levels depend on more than light intensity
The leaf would respire at a higher rate than photosynthesis
12
Plant cells can become plasmolysed but animal cells can't because:
Plant cells have a cell wall which withstands high pressures
Animal cells lyse in high concentrations of water
They have a vacuole which stores minerals and water
Plasmolysis is the cell membrane separating from a cell wall
13
The limiting factor at point B is:
Carbon dioxide concentration
Light intensity
Temperature
14
How is a leaf adapted for gas exchange?
Irregularly shaped spongy mesophyll increases surface area
Large numbers of chloroplasts absorb light
Guard cells can close to conserve water
Cuticle is impermeable to reduce water loss
15
What is the function of the vacuole in plant cells?
Contains chlorophyll to absorb sunlight
Store cell sap containing minerals
Keeps cells rigid
16
Which of these is the upper epidermis?
C
A
D
B
17
Which of these is a feature of layer C
Forms a barrier to micro-organisms
Regular shape for close packing to maximise light absorption
Transparent to allow light directly through
Have large numbers of chloroplasts for photosynthesis
18
In a sealed tube with a leaf in bright light, hydrogen carbonate indicator would turn:
Yellow
Orange
Red
Purple
19
Which of these is the reason plants need high concentrations of magnesium?
For making cell walls
For building proteins
For making DNA
For making chlorophyll
20
Which pair of substances are moved in the phloem?
Sucrose & Minerals
Sucrose & amino acids
Water & Minerals
Water and Amino acids
21
Which factor appears to have the greatest effect on the rate of transpiration?
Wind Speed
Temperature
Base
Light Intensity
22
Water moves up the xylem because:
Water is drawn up by gravity
Water is continually lost by transpiration at leaves
Water moves through cells in the xylem by osmosis
Water is pumped up from the roots
23
Which of the following processes are used for moving substances in plants?
Diffusion
Transpiration
Osmosis
Active Transport
24
Which factor, not shown in the table, can affect the rate of transpiration?
Humidity
Temperature
Mineral concentration
25
This is a lower epidermis of a land plant. How would the upper epidermis be different?
More cells
More stomata
Fewer Nuclei
Fewer stomata
26
Which of these is an organ in plants?
Spongy mesophyll
Xylem
Leaf
Chloroplast
27
Which of these is the balanced chemical equation for photosynthesis?
6O2 + 6H2O → 6CO2 + C6H12O6 +
6CO2 + 6H2O → C6H12O6 + O2
6CO2 + 6H2O → C6H12O6 + 6O2
C6H12O6 + 6O2 → 6CO2 + 6H2O
28
The limiting factor at point C is:
Light Intensity
Temperature
Carbon dioxide concentration
29
Which is the correct
word
equation for photosynthesis?
Glucose + Oxygen → Carbon dioxide + Water
Carbon dioxide + Glucose →Water + Oxygen
Carbon dioxide + Water → Sucrose + Amino Acids
Carbon dioxide + Water → Oxygen + Glucose
30
Phloem transport substances:
Up plants
To new growing regions
Down plants
All of the above
31
Which of these organelles is found in plant and animal cells?
Vacuole
Cell wall
Mitochondria
Chloroplasts
32
Without
nitrates, plants would:
be yellow
be shorter
Have few, large leaves
Not germinate
33
Iodine is used to show evidence of photosynthesis because:
It changes colour in the presence of glucose
It stops the leaf from carrying out reactions
The glucose made is stored as starch
It removes the chlorophyll from the leaves
34
How does water enter the roots?
Loss of water from leaves reduces the water concentration
Active transport of minerals reduces the water concentration
The soil is highly saturated with water
35
Name this apparatus
Potometer
Colorimeter
Chlorogram
Hygrometer
36
A leaf in a tube covered with black card, would turn the indicator:
Red
Yellow
Purple
Orange
37
Explain why the plants transpire faster with a lamp
Reduces the concentration of water vapour outside the leaf
Evaporates the boundary layer reduces diffusion distance
Increases kinetic energy and evaporation of water molecules
Stomata open as photosynthesis rate increases
38
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
39
Transpiration is a necessary evil in plants because:
It draws minerals up the xylem
Stomata must be open to absorb carbon dioxide
40
In a starch leaf test, area A of this leaf would turn:
Blue-black
Orange
Brick-red
Blue
41
Why do guard cells have chloroplasts?
To make glucose from photosynthesis
To detect light and open the stomata in the day
To be camouflaged with the other leaf cells
42
Which use of different carbohydrates in correct?
Cellulose for building the cell wall
Starch as the main substrate used in respiration
Glucose for moving in the phloem
Sucrose for long term storage of energy
43
Which of these
does not
affect the rate of photosynthesis?
Light intensity
Chlorophyll concentration
Leaf surface area
Water
44
The limiting factor at point D is:
Carbon dioxide concentration
Light intensity
Tempearture
45
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
