Eutrophication

Last updated: 11/03/2022

AQA A-Level Biology Nutrient Cycle Eutrophication

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Question 1 of 26

1. Question
The increased ratio of chemical nutrients leads to a gradual increase in biological productivity of an aquatic ecosystem with time, which is classified as:
- Eutrophication
- Triplication
- Algal bloom formation
- None of these
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Question 2 of 26

2. Question
Eutrophication is commonly linked to…
- All of these
- Algal blooms
- Red and “green tides
- Public health threats
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Question 3 of 26

3. Question
Which of the following is the test to determine the amount of oxygen needed to oxidise all pollution materials?
- Biological Oxygen Demand (BOD)
- Chemical Oxygen Demand
- Physical Oxygen Demand
- Botanical Oxygen Demand
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Question 4 of 26

4. Question
Human-induced acceleration of the eutrophication process is called…
- Cultural eutrophication
- Regional eutrophication
- Biological eutrophication
- Physical eutrophication
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Question 5 of 26

5. Question
Overabundance of ———- are the two main nutrients responsible for triggering eutrophication.
- Nitrogen and phosphorous
- Nitrogen and sufur
- Sodium and boron
- P and K
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Question 6 of 26

6. Question
What happens when nutrients and detergents in water lead to an acceleration in the growth of algae?
- Eutrophication
- Increase in number of fishes
- Increase in the number of aquatic plants
- All of these
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Question 7 of 26

7. Question
How does the value of COD compare to the value of BOD?
- Much higher
- Zero
- Low
- Much lower
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Question 8 of 26

8. Question
Which of the following characterises hypoxia in lakes?
- Low oxygen conditions
- High oxygen condition
- Complete absence of oxygen
- Moderate level of oxygen
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Question 9 of 26

9. Question
A middle layer in which the density gradient is larger is known as…
- Metalimnion
- Epilimnion
- Hypolimnion
- Stratified lack
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Question 10 of 26

10. Question
Lakes which mix twice a year (usually in the autumn and spring) are called…
- Dimictic
- Holomictic
- Isomictic
- Monomictic
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Question 11 of 26

11. Question
A——— is an area within a lake that is either hypoxic or anoxic, and in which few organisms can survive.
- Dead zone
- Open zone
- Close zone
- Danger zone
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Question 12 of 26

12. Question
Consumption of —— and low oxygen input in the hypolimnion combine to create extremely low oxygen levels during thermal stratification.
- Oxygen
- Nutrients
- Nitrogen
- All of these
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Question 13 of 26

13. Question
A/An ——– lake has low nutrient concentrations and low plant growth (e.g., Lake Superior).
- Oligotrophic
- Eutrophic
- Isotrophic
- Mesotrophic
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Question 14 of 26

14. Question
The eutrophication of water bodies – which leads to the killing of fish – is mainly due to non-availability of…
- Oxygen
- Light
- Food
- Nutrients
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Question 15 of 26

15. Question
A water body with an inflow of domestic sewage (which is rich in organic waste) may lead to…
- Death of fish due to lack of oxygen
- Increase in fish population due to biodegradable nutrients
- Drying of river
- All of these
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Question 16 of 26

16. Question
A high BOD means…
- Lots of organic material and aerobic microbes
- Lack of organic material and many aerobic microbes
- Lack of both
- None of these
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Question 17 of 26

17. Question
Which of the following promotes the eutrophication of lakes?
- Phosphorous
- Magnesium
- Sodium
- Calcium
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Question 18 of 26

18. Question
What is ‘opposite’ to a eutrophic lake?
- An oligotrophic lake
- A mesotrophic lake
- An isotrophic lake
- All of these
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Question 19 of 26

19. Question
Which of the following lakes has minimum productivity?
- Oligotrophic lake
- Mesotrophic lake
- Isotrophic lake
- Senescent lake
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Question 20 of 26

20. Question
The depth of the euphotic zone is measured by…
- Secchi disk
- Radar
- Calorimeter
- Turbidity meter
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Question 21 of 26

21. Question
The inflection point of the density gradient that separates the epilimnion and hypolimnion is known as the…
- Thermocline
- Metalimnion
- Both are correct
- None of these
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Question 22 of 26

22. Question
When fertiliser rich in nitrate and phosphate sparks the overgrowth of algae in water bodies, this is called…
- Algal bloom
- Dead zone
- Dead bodies
- None of these
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Question 23 of 26

23. Question
Drinking nitrate-contaminated water may lead to…
- Blue baby syndrome
- Kidney infection
- Urine problems
- None of these
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Question 24 of 26

24. Question
Nitrogen (e.g. ammonia, nitrates) can be a concern because it can cause acidification by reacting with —–?
- Water
- Carbon dioxide
- Oxygen
- All of these
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Question 25 of 26

25. Question
Eutrophication may lead to turbidity in lakes because of…
- Algal bloom
- Fewer plants
- More fish
- All of these
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Question 26 of 26

26. Question
Select the correct order of the stages of eutrophication.
- Addition of nitrates, plant growth and death, growth of bacteria, lack of oxygen, suffocation
- Lack of oxygen, addition of nitrates, plant growth and death, growth of bacteria, suffocation
- Addition of nitrates, plant death, growth of bacteria, lack of oxygen, suffocation
- Addition of nitrates, lack of oxygen, plant growth and death, growth of bacteria, suffocation
Correct

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