Phosphorus Cycle

Last updated: 11/03/2022

AQA A-Level Biology Nutrient Cycle Phosphorus Cycle

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Question 1 of 24

1. Question
Which one of the following is a major constituent of biological membranes, nucleic acids, and cellular energy transfer systems?
- Phosphorous
- Potassium
- Selenium
- Cobalt
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Question 2 of 24

2. Question
Which of the following is a major constituent of DNA and RNA?
- Phosphorous
- Calcium
- Cobalt
- Selenium
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Question 3 of 24

3. Question
Which of the following components is found in shells, bones, and teeth in animals?
- Phosphorous
- Sodium
- Gallium
- Argon
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Question 4 of 24

4. Question
Which one of the following is the simplified sequence of phosphorus cycling in a terrestrial ecosystem?
- Rock minerals → Soil → Producers → Consumers → Decomposers
- Soil → Producers → Rock minerals → Consumers → Decomposers
- Rock minerals → Decomposers → Producers → Consumers
- Decomposers → Rock minerals → Consumers → Producers
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Question 5 of 24

5. Question
How is the gaseous exchange of phosphorus between organisms and the environment?
- Negligible
- Moderate
- Maximum
- No exchange
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Question 6 of 24

6. Question
In which form do the producers directly provide phosphorous to detritus?
- Litterfall
- Weathering
- Fecal matter
- Salts
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Question 7 of 24

7. Question
What name is given to the killing of aquatic life due to the depletion of oxygen, because of the excessive growth of algae due to the over-abundance of phosphorus in the coastal areas?
- Eutrophication
- Leaching
- Respiration
- Photosynthesis
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Question 8 of 24

8. Question
Phosphorus is passed from plants to ____ who eat them
- Scavengers
- Plants
- Animals
- Humans
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Question 9 of 24

9. Question
Which of the following statements is true of the phosphorus cycle?
- The phosphorus cycle utilises the processes of erosion, and weathering.
- Phosphorus enters the atmosphere as phosphates
- Phosphates are used in carbohydrate and glucose storage
- The phosphorus cycle utilises bacteria to break down phosphates and make them available for plants.
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Question 10 of 24

10. Question
What role do decomposers play in the phosphorous cycle?
- Return phosphorous into the soil
- Absorb phosphorous
- Release phosphorous into atmosphere
- Combustion
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Question 11 of 24

11. Question
Which nutrient is not cycled through the atmosphere and stays only on ground level?
- Phosphorus
- Carbon
- Nitrogen
- Water
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Question 12 of 24

12. Question
This is NOT a part of the phosphorus cycle.
- Atmospheric phosphate
- Phosphate is incorporated into sedimentary rocks
- Phosphate is bound to soil
- Phosphate is absorbed from the soil by plants
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Question 13 of 24

13. Question
In general, algal blooms occur when
- Nutrients increase in the water
- Toxins accumulate in shellfish
- Nutrients decrease in the water
- Nutrients decrease in soil
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Question 14 of 24

14. Question
The phosphorus cycle is fundamentally different from the nitrogen and sulfur cycles. How so?
- The phosphorus cycle does not include a gaseous phase, resulting in no significant quantities of atmospheric phosphorus
- Phosphorus is not taken up by plants and is a strictly inorganic cycle.
- Phosphorus is not fixed in the atmosphere by lightning.
- Phosphorus does not enter the cycle from weathering of sediments and parent material.
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Question 15 of 24

15. Question
Phosphorus is difficult for plants and animals to access in nature because…
- Most phosphorus in the environment is stored in reservoirs
- It reacts quickly with other elements, like oxygen
- Most phosphorus in the environment is bound to carbon, nitrogen, and hydrogen.
- It is typically found as a phosphate
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Question 16 of 24

16. Question
The Experimental Lakes Area was an important contribution to environmental science because
- It made clear connections between phosphate fertilisers and eutrophication in lakes
- It showed how dangerous algae can be to an aquatic ecosystem
- It was the first instance of extreme science
- It resulted in recorded data on depth, visibility, and conductivity in 463 lakes
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Question 17 of 24

17. Question
Phosphorus does NOT travel through which of the following spheres?
- Atmosphere
- Lithosphere
- Biosphere
- Geosphere
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Question 18 of 24

18. Question
Phosphorus is needed in organisms for the production of…
- All of the answers are correct
- ADP and ATP.
- Cellular membranes.
- Deoxyribonucleic and ribonucleic acids.
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Question 19 of 24

19. Question
The more nitrogen (and phosphorus) oceanic phytoplankton receive the more ____ they will be.
- Productive
- Boring
- Active
- Spry
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Question 20 of 24

20. Question
This is released by the weathering of rocks.
- Phosphorus
- Carbon
- Oxygen
- Nitrogen
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Question 21 of 24

21. Question
Which of the following best explains why the phosphorous cycle commences in the earth’s crust?
- Rocks have abundant phosphorus
- Phosphorus is found no where else
- Phosphorus is volatile
- Phosphorus is liquid at normal temperatures and pressures
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Question 22 of 24

22. Question
Pick the incorrect statement about phosphorus cycle
- It is a rapidly occurring process
- It involves movement of phosphorus through various layers of atmosphere
- Weathering is a step in the phosphorus cycle
- Phosphorus is an important component of ATP
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Question 23 of 24

23. Question
Phosphorus deposited from guano close to the shore that has been dissolved in the ocean by runoff and deposited in the ocean floor can be brought to the surface by what phenomena?
- Nutrient upwellings
- Phytoplankton
- Zooplankton
- Chemical sublimation
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Question 24 of 24

24. Question
Human disruption often prevents phosphates absorbed by plants from returning to their original soil. Instead, these phosphates accumulate in…
- Human sewage
- Sedimentary rocks
- Nuclear waste
- Uncultivated land
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