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Edexcel iGCSE Biology: Plant Nutrition-Photosynthesis Flashcards | StudBud
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Edexcel iGCSE Biology: Plant Nutrition-Photosynthesis
Edexcel iGCSE Biology: Plant Nutrition-Photosynthesis
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#iGCSE #Edexcel #Biology #Photosynthesis #Plants #Nutrition
Flashcards
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Questions
22
Answers
1
The diagram shows a cross section of the leaf. What does
letter C
represent?
Upper epidermis
Palisade mesophyll
Spongy mesophyll
Palisade epidermis
2
Which of these are
only
found in a plant cell?
Nucleus
Cell membrane
Chloroplasts
Mitochondria
3
Plants
only
photosynthesise in the day and
only
respire at night...
True
False
4
The diagram shows a cross section of the leaf. What does
letter E
represent?
Air spaces
Guard cells
Stomata
Upper epidermis
5
The graph below represents which
limiting factor of photosynthesis
?
Light intensity
Temperature
Water
Carbon Dioxide
6
What gas diffuses into the leaf through the stomata during the day?
Carbon dioxide
Oxygen
7
Tube C is set up with aluminium foil around it. Why will the indicator in this tube turn
yellow
?
An increased concentration of CO2
Photosynthesis is happening at a higher rate than respiration
A decreased concentration of CO2
Only respiration is taking place (no photosynthesis)
8
What
two reactants
are needed for photosynthesis to take place?
Carbon Dioxide and Water
Oxygen and Glucose
Oxygen and Carbon Dioxide
Oxygen and Water
9
Which part of the leaf labelled A-D will go
blue-black
when tested with iodine?
D
A
C
B
10
What causes
stomata to open
in the day to allow gases to enter and exit the leaf?
Water moves in causing guard cells to become turgid
Water moves in causing guard cells to become flaccid
Water moves out causing guard cells to become flaccid
Water moves out causing guard cells to become flaccid
11
What colour will
hydrogen carbonate indicator
go in tube A if left in the light?
orange
yellow
purple
green
12
Explain why the rate of photosynthesis decreases at
high
temperatures..
enzymes controlling the reaction are all being used
it is too hot and the water required will just evaporate
enzymes controlling the reaction have denatured
temperature is a limiting factor
13
Sodium hydroxide or potassium hydroxide can be used in photosynthesis to...
absorb oxygen
absorb carbon dioxide
absorb chlorophyll
absorb light
14
How is the
palisade mesophyll
specialised for increasing photosynthesis?
Contains many chloroplasts
Contains air spaces
Waterproof
Is at the top of the leaf
15
What is the
independent variable
in this investigation?
Amount of CO2 available
Temperature
Light intensity
Number of leaves on the pondweed
16
Letter D
represents the
spongy mesophyll
. Why does this tissue have many air spaces?
Make the leaf more spongy
Increase rate of photosynthesis
Absorb more water
Increase surface area for gas exchange
17
Farmers may use
fertilisers
on their crops. Why are
nitrates
(found in fertilisers) required?
Combine with glucose to make cellulose
Combine with glucose to make starch
Combine with glucose to make amino acids
Combine with glucose to make sucrose
18
What is the
dependent variable
in this investigation?
Temperature
Distance of the lamp from the pondweed
Number of oxygen bubbles produced
Amount of CO2 available
19
Letter B
represents the
upper epidermis
. How is this part of leaf adapted for photosynthesis?
Contains many chloroplasts
Many air spaces
Waterproof
Contains no chloroplasts-transparent
20
Which of the following is
not
a way in which plants use glucose?
converted into cellulose
stored as starch
used in photosynthesis
used in respiration
21
When testing a leaf for starch the leaf is placed in
hot ethanol
. What is the reason for this?
Denatures enzymes that carry out photosynthesis
Softens the leaf
Removes the chlorophyll
Kills the leaf
22
In this experiment, what solution can be used to test that photosynthesis has taken place?
Iodine
Ethanol
Biuret
Benedicts
