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Course: Edexcel Modular - OL
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Edexcel Modular - OL

1. The Nature and Variety of Living Organisms

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2. Structures and Functions in Living Organisms

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3. Reproduction and Inheritance

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4. Ecology and the Environment

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5. Use of Biological Resources

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Quiz

Cycles within Ecosystems (Unit 2) – Check yourself

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Cycles within Ecosystems Edexcel O Level Modular Biology check yourself quiz: free practice for Edexcel Modular – OL. Work through this Cycles within Ecosystems Edexcel O Level Modular Biology check yourself quiz and get instant feedback on every answer. If you get stuck, review the 4.3 Cycles within ecosystems — Notes lesson. More practice: Edexcel Modular – OL — all units. Syllabus: Pearson Edexcel International GCSEs.

  • Questions count: 14
  • Passing grade: B+
  • Time limit: 10 minutes
Start Quiz
1.
Which process removes carbon dioxide from the atmosphere?
Respiration
Combustion
Photosynthesis
Decomposition
2.
In what form do plants usually absorb nitrogen?
Nitrogen gas
Nitrate ions
Amino acids
Proteins
3.
Nitrifying bacteria convert:
Ammonium to nitrate
Nitrate to nitrogen gas
Nitrogen gas to ammonium
Protein to ammonium
4.
Which adds carbon dioxide to the air?
Photosynthesis
Formation of fossil fuels
Nitrogen fixation
Burning fossil fuels
5.
Which statement best describes Denitrification?
The conversion of nitrogen gas into ammonium or nitrate compounds, e.g. by bacteria or lightning.
The conversion of nitrates in soil back into nitrogen gas by denitrifying bacteria in waterlogged, anaerobic soils.
Decomposers converting proteins and urea in dead matter and waste into ammonium compounds.
Swellings on the roots of legumes containing nitrogen-fixing bacteria.
6.
Which statement best describes Nitrification?
The continuous movement of nitrogen between the atmosphere, soil and living organisms.
The continuous movement of carbon between the atmosphere, organisms, oceans and fossil fuels.
Swellings on the roots of legumes containing nitrogen-fixing bacteria.
The conversion of ammonium ions into nitrites and then nitrates by nitrifying bacteria.
7.
Which statement best describes Carbon cycle?
The continuous movement of carbon between the atmosphere, organisms, oceans and fossil fuels.
An organism such as a bacterium or fungus that breaks down dead material and waste.
The conversion of nitrogen gas into ammonium or nitrate compounds, e.g. by bacteria or lightning.
The conversion of ammonium ions into nitrites and then nitrates by nitrifying bacteria.
8.
IGCSE Biology 19.3 The carbon cycle - Question 1
IGCSE Biology 19.3 The carbon cycle - Question 1
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9.
IGCSE Biology 19.3 The carbon cycle - Question 2
IGCSE Biology 19.3 The carbon cycle - Question 2
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10.
IGCSE Biology 19.3 The carbon cycle - Question 3
IGCSE Biology 19.3 The carbon cycle - Question 3
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11.
IGCSE Biology 19.4 The nitrogen cycle - Question 1
IGCSE Biology 19.4 The nitrogen cycle - Question 1
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12.
IGCSE Biology 19.4 The nitrogen cycle - Question 2
IGCSE Biology 19.4 The nitrogen cycle - Question 2
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13.
IGCSE Biology 19.4 The nitrogen cycle - Question 3
IGCSE Biology 19.4 The nitrogen cycle - Question 3
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14.
IGCSE Biology 19.4 The nitrogen cycle - Question 4
IGCSE Biology 19.4 The nitrogen cycle - Question 4
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Part of 4. Ecology and the Environment — see every lesson and quiz in this unit.
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