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Course: Alhussan Biology — Stage 9
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Alhussan Biology — Stage 9

Chapter 9: Plants and Photosynthesis

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Chapter 10: Excretion in Humans

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Chapter 11: Human Genetics and Development

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Chapter 12: The Carbon Cycle and Climate Change

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Chapter 13: Variation and Natural Selection

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Quiz

Biology 12.1 The carbon cycle — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Glucose is used to make other ____.
gases
rocks
metals
carbon compounds
2.
A plant took in 50 g of CO2 and gave out 8 g in a day. What is the net uptake?
42 g
−42 g
6 g
58 g
3.
True or false? Carbon is only found in animals.
True
False
4.
Which term matches this definition? “A substance containing carbon, e.g. glucose or protein.”
Carbon compound
Reforestation
Feedback
Evidence
5.
Without decomposers carbon would stay locked in ____.
dead material
oceans
air
sun
6.
Which process removes carbon dioxide from the air?
Respiration
Photosynthesis
Combustion
Decomposition
7.
Decomposers release carbon dioxide by ____.
melting
freezing
respiration
photosynthesis
8.
True or false? Plants take in carbon dioxide during photosynthesis.
True
False
9.
True or false? Carbon dioxide is 21% of air.
True
False
10.
Air is 0.04% carbon dioxide. How many cm³ of CO2 are in 100000 cm³ of air?
400 cm³
40 cm³
4000 cm³
2,500,000 cm³
11.
Carbon dioxide is about ____% of the air.
0.04
78
4
21
12.
True or false? Glucose is used to make other carbon compounds.
True
False
13.
Mass lost by leaves decomposing in a bag. Between which two values of "Week" did "Mass (g)" change the most?
Dr Dabour Hub Academy - figure 1
2 and 4
6 and 8
4 and 6
0 and 2
14.
A plant took in 30 g of CO2 and gave out 10 g in a day. What is the net uptake?
−20 g
20 g
40 g
3 g
15.
Air is 0.04% carbon dioxide. How many cm³ of CO2 are in 1000 cm³ of air?
40 cm³
25,000 cm³
4 cm³
0 cm³
16.
Look at the carbon cycle. Which process is shown by the arrow from "CO₂ in air" to "Plants"?
Dr Dabour Hub Academy - figure 2
Photosynthesis
Combustion
Respiration
Decomposition
17.
Which statement is NOT correct?
Decomposers absorb carbon dioxide.
Respiration releases carbon dioxide.
Burning fuels releases carbon dioxide.
All living things contain carbon compounds.
18.
At night plants only ____.
burn
respire
decay
photosynthesise
19.
Leaves lost mass from 40 g to 20 g. Calculate the percentage decrease.
100%
50%
20%
500%
20.
Soil holds 1500 and the atmosphere 750 billion tonnes of carbon. How many times more in soil?
0.5 times
750.0 times
2250.0 times
2.0 times
21.
Which statement is correct?
Fossil fuels formed in a few years.
Carbon passes along food chains as food.
Decomposers absorb carbon dioxide.
Plants photosynthesise at night.
22.
True or false? Plants photosynthesise at night.
True
False
23.
Photosynthesis gives out ____.
methane
oxygen
nitrogen
carbon dioxide
24.
Carbon stored in different stores (billion tonnes). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
25.
Which arrow in the carbon cycle diagram shows combustion?
Dr Dabour Hub Academy - figure 4
Fossil fuels → CO₂ in air
Animals → Decomposers
CO₂ in air → Plants
Plants → Animals
26.
Carbon dioxide in the atmosphere. By how much does "CO2 (ppm)" change between 1960 and 2020?
Dr Dabour Hub Academy - figure 5
413
96
120
730
27.
Which term matches this definition? “Burning a fuel in oxygen.”
Global warming
Methane
Combustion
Greenhouse effect
28.
Carbon stored in different stores (billion tonnes). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 6
A
B
C
D
29.
All living things contain ____ compounds.
carbon
neon
gold
iron
30.
CO2 taken in or given out by a plant over a day. At what value of "Time (h)" is "CO2 uptake (units)" smallest?
Dr Dabour Hub Academy - figure 7
20
16
24
0
31.
A plant took in 50 g of CO2 and gave out 12 g in a day. What is the net uptake?
4 g
62 g
−38 g
38 g
32.
Which is the correct definition of “Combustion”?
A model estimate of future values.
A statement of what is expected to happen.
A greenhouse gas from cattle and rice fields.
Burning a fuel in oxygen.
33.
Mass lost by leaves decomposing in a bag. At what value of "Week" is "Mass (g)" smallest?
Dr Dabour Hub Academy - figure 8
8
0
4
6
34.
Carbon dioxide in the atmosphere. Between which two values of "Year" did "CO2 (ppm)" change the most?
Dr Dabour Hub Academy - figure 9
2000 and 2010
2010 and 2020
1980 and 2000
1960 and 1980
35.
Plants turn carbon dioxide into ____.
water
oxygen
glucose
nitrogen
36.
Which statement is NOT correct?
Oceans cannot hold carbon dioxide.
Burning fuels releases carbon dioxide.
Forests act as carbon sinks.
Plants turn carbon dioxide into glucose.
37.
Carbon dioxide makes up about ____% of air.
78
21
0.04
4
38.
Mass lost by leaves decomposing in a bag. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
39.
Which term matches this definition? “An organism that breaks down dead material.”
Sea level rise
Peer review
Decomposer
Deforestation
40.
Which process returns carbon dioxide to the air?
Fossilisation
Feeding
Photosynthesis
Respiration
41.
A tree takes in 22 kg of CO₂ a year and releases 8 kg by respiration. What is the net CO₂ taken in?
14 kg
3 kg
−14 kg
30 kg
42.
Carbon moves between living things and the ____.
sun
core
environment
moon
43.
True or false? Both plants and animals respire.
True
False
44.
Oceans ____ carbon dioxide.
dissolve
destroy
block
produce
45.
Leaves lost mass from 60 g to 18 g. Calculate the percentage decrease.
233%
42%
70%
30%
46.
Which term matches this definition? “Plants using light to turn carbon dioxide and water into glucose.”
Photosynthesis
Ice sheet
Methane
Weather
47.
Soil holds 1700 and the atmosphere 850 billion tonnes of carbon. How many times more in soil?
0.5 times
850.0 times
2550.0 times
2.0 times
48.
Burning fuels releases ____.
nitrogen only
carbon dioxide
oxygen
hydrogen only
49.
Which term matches this definition? “Release of energy from glucose, giving out carbon dioxide.”
Extreme weather
Combustion
Anomaly
Respiration
50.
CO2 taken in or given out by a plant over a day. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 11
"CO2 uptake (units)" rises to a peak at 12, then falls
"CO2 uptake (units)" decreases as "Time (h)" increases
"CO2 uptake (units)" stays the same
"CO2 uptake (units)" increases as "Time (h)" increases
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Part of Chapter 12: The Carbon Cycle and Climate Change — see every lesson and quiz in this unit.
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