Lesson 3.5.4.1
3.5.4.1 Carbon and nitrogen cycles Quiz: AQA Biology, Unit 5
20 questions
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Lesson 3.5.4.1, Carbon and nitrogen cycles: 20 multiple choice questions for the AQA Biology (7402), Unit 5: Energy transfers in and between organisms, written with Revision Ninja.
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The 20 questions
-
Which process removes carbon dioxide from the atmosphere in the carbon cycle?
- Denitrification
- Photosynthesis
- Respiration
- Combustion
-
Which process converts atmospheric nitrogen gas into nitrogen-containing compounds?
- Denitrification
- Nitrogen fixation
- Ammonification
- Nitrification
-
Which process converts nitrates into nitrogen gas?
- Nitrification
- Ammonification
- Denitrification
- Nitrogen fixation
-
Which process converts nitrogen compounds in dead organic matter into ammonia?
- Nitrogen fixation
- Ammonification
- Nitrification
- Denitrification
-
Which process oxidises ammonium ions into nitrites and then nitrates?
- Nitrogen fixation
- Denitrification
- Nitrification
- Ammonification
-
Which organisms decompose dead organic matter and release mineral ions into soil?
- Mycorrhizae
- Nitrifying bacteria
- Denitrifying bacteria
- Saprobionts
-
Which fungi form mutualistic associations with plant roots to improve ion uptake?
- Rhizobium
- Saprobionts
- Nitrosomonas
- Mycorrhizae
-
Which nitrogen cycle process increases in anaerobic, waterlogged soil?
- Ammonification
- Denitrification
- Nitrification
- Nitrogen fixation
-
Which sequence shows nitrogen moving from dead matter back to gas?
- Denitrification, nitrification, ammonification
- Ammonification, denitrification, nitrification
- Ammonification, nitrification, denitrification
- Nitrification, ammonification, denitrification
-
Plants absorb nitrate ions primarily to synthesise which molecules?
- Triglycerides
- Amino acids
- Starch
- Fatty acids
-
Which process releases carbon dioxide back to the atmosphere from dead organic matter?
- Nitrogen fixation
- Respiration by saprobionts
- Photosynthesis by producers
- Denitrification
-
Which organisms recycle elements from dead matter in both carbon and nitrogen cycles?
- Saprobionts
- Primary consumers
- Secondary consumers
- Photoautotrophs
-
Which human activity directly increases atmospheric carbon dioxide levels?
- Nitrogen fixation
- Crop rotation
- Eutrophication
- Burning fossil fuels
-
What product do nitrogen-fixing bacteria produce directly from nitrogen gas?
- Nitrates
- Nitrites
- Nitrogen dioxide
- Ammonia
-
Without saprobionts, where would most carbon and nitrogen remain locked?
- Atmospheric gas
- Root nodules
- Dead organic matter
- Soil solution
-
How do mycorrhizae increase plant absorption of phosphate ions?
- Fixing phosphate gas
- Secreting plant hormones
- Increasing surface area
- Lowering soil pH
-
Why are nutrients in ecosystems described as recycled?
- Energy is conserved
- Biomass remains constant
- Mass is created
- Elements are reused
-
What role do Rhizobium bacteria play within the roots of leguminous plants?
- Denitrification
- Nitrogen fixation
- Nitrification
- Ammonification
-
Which process in the nitrogen cycle converts ammonium ions into nitrate ions?
- Ammonification
- Nitrogen fixation
- Nitrification
- Denitrification
-
Which nitrogen-containing ion do plants primarily absorb directly from soil?
- Urea molecules
- Nitrite ions
- Nitrate ions
- Nitrogen gas
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