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