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IGCSE Biology: Plant Nutrition-Photosynthesis Flashcards | StudBud
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IGCSE Biology: Plant Nutrition-Photosynthesis
IGCSE Biology: Plant Nutrition-Photosynthesis
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#iGCSE #Edexcel #Biology #Photosynthesis #Plants #Nutrition
Flashcards
25 cards
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Practice quiz
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Questions
25
Answers
1
Which of the following variables
are not controlled
in this experiment?
Temperature
Light intensity
Number of leaves on the pondweed
Amount of CO2 available
2
Which of the following is
not
a way in which plants use glucose?
used in photosynthesis
converted into cellulose
stored as starch
used in respiration
3
Farmers may use
fertilisers
on their crops. Why are
nitrates
(found in fertilisers) required?
Combine with glucose to make sucrose
Combine with glucose to make cellulose
Combine with glucose to make starch
Combine with glucose to make amino acids
4
Tube C is set up with aluminium foil around it. Why will the indicator in this tube turn
yellow
?
Photosynthesis is happening at a higher rate than respiration
An increased concentration of CO2
A decreased concentration of CO2
Only respiration is taking place (no photosynthesis)
5
Explain why the rate of photosynthesis decreases at
high
temperatures..
it is too hot and the water required will just evaporate
temperature is a limiting factor
enzymes controlling the reaction have denatured
enzymes controlling the reaction are all being used
6
Plants
only
photosynthesise in the day and
only
respire at night...
False
True
7
The graph below represents which
limiting factor of photosynthesis
?
Carbon Dioxide
Temperature
Water
Light intensity
8
Which of these are
only
found in a plant cell?
Nucleus
Cell membrane
Chloroplasts
Mitochondria
9
What does sodalime do in an experiment to investigate factors of photosynthesis?
Evolve CO2
Absorb H2O
Evolve O2
Absorb CO2
10
What are organisms that make their own food called?
heterotrophs
autotrophs
parasites
saprotrophs
11
How is the
palisade mesophyll
specialised for increasing photosynthesis?
Waterproof
Contains many chloroplasts
Is at the top of the leaf
Contains air spaces
12
What causes
stomata to open
in the day to allow gases to enter and exit the leaf?
Water moves out causing guard cells to become flaccid
Water moves out causing guard cells to become flaccid
Water moves in causing guard cells to become flaccid
Water moves in causing guard cells to become turgid
13
When testing a leaf for starch the leaf is placed in
hot ethanol
. What is the reason for this?
Removes the chlorophyll
Denatures enzymes that carry out photosynthesis
Kills the leaf
Softens the leaf
14
What condition is caused by a magnesium deficiency?
Chloroform
Chloroplasts
Chlorosis
Chlorophyll
15
In this experiment, what solution can be used to test that photosynthesis has taken place?
Biuret
Iodine
Benedicts
Ethanol
16
What
two reactants
are needed for photosynthesis to take place?
Oxygen and Glucose
Oxygen and Water
Carbon Dioxide and Water
Oxygen and Carbon Dioxide
17
Which of the following shows a balanced chemical equation for photosynthesis?
6CO2 + 6H20 ----Light & Chlorophyll--> C2H12O6 + 6O2
CO2 + H20 ----Light & Chlorophyll--> C2H12O6 + O2
6CO2 + 6H20 --Light & Chlorophyll--> C6H12O6 + 6O2
18
Sucrose is used to transport carbohydrates in the plant because
Both options
Glucose is reactive
Neither option
Glucose will decrease the water potential
19
Letter D
represents the
spongy mesophyll
. Why does this tissue have many air spaces?
Increase rate of photosynthesis
Make the leaf more spongy
Absorb more water
Increase surface area for gas exchange
20
What is the adaptation of palisade mesophyll cells
they are elongated and compact
they control the opening of the stomata
they allow gases to pass through them
they have air spaces between them
21
What structures are contained in the leaf vein?
xylem and phloem
chloroplasts
ethanol
O2 and CO2
22
What colour will
hydrogen carbonate indicator
go in tube A?
orange
green
yellow
purple
23
Which part of the leaf labelled A-D will go
blue-black
when tested with iodine?
D
B
C
A
24
What is the
dependent variable
in this investigation?
Number of oxygen bubbles produced
Distance of the lamp from the pondweed
Temperature
Amount of CO2 available
25
The diagram shows a cross section of the leaf. What does
letter C
represent?
Palisade mesophyll
Upper epidermis
Palisade epidermis
Spongy mesophyll
