Objective Questions on Biofloc Technology (BFT) in Fisheries
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Biofloc Technology System |
MCQ on Biofloc Technology
1. What is biofloc technology?
a) A method of growing plants in water
b) A method of aquaculture that uses microbial
communities to convert waste into nutrients for aquatic organisms
c) A method of growing algae in water
d) A method of fish farming that uses artificial light
to enhance growth
Answer:
b
2. What is the purpose of aeration systems in biofloc
technology?
a) To maintain
the temperature of the water in the culture tanks
b) To remove contaminants from the water in the
culture tanks
c) To maintain oxygen levels in the culture tanks
d) To provide the aquatic organisms with food
Answer:
c
3. What is the function of biofilter systems in biofloc
technology?
a) To remove settled solids from the water in
the culture tanks
b) To maintain water quality in the culture tanks
c) To provide the aquatic organisms with food
d) To control the temperature of the water in the
culture tanks
Answer:
b
4. What is the purpose of settling tanks in biofloc
technology? a) To remove contaminants from the water in the culture tanks b) To
maintain water quality in the culture tanks c) To remove settled solids from
the water in the culture tanks d) To maintain oxygen levels in the culture
tanks
Answer:
c
5. What is the importance of water treatment systems in
biofloc technology? a) To remove settled solids from the water in the culture
tanks
b) To maintain
water quality in the culture tanks
c) To provide the aquatic organisms with food
d) To control the temperature of the water in the
culture tanks
Answer:
b
6. Which of the following is a benefit of using biofloc
technology in aquaculture? a) Reduced water usage b) Higher energy costs c)
Increased reliance on antibiotics d) Increased use of chemical fertilizers
Answer:
a
7. What type of organisms can be grown using biofloc
technology? a) Only fish b) Only shrimp c) Both fish and shrimp d) Only algae
Answer:
c
8. What is the optimal pH range for biofloc systems? a)
6.0-6.5 b) 7.0-7.5 c) 8.0-8.5 d) 9.0-9.5
Answer:
b
9. What is the typical color of biofloc in culture tanks?
a) Green b) Blue c) Brown d) Red
Answer:
c
10. What is the
primary nutrient source for biofloc microbial communities? a) Sunlight b)
Oxygen c) Nitrogen d) Carbon
Answer:
d
11.
What is the role
of probiotics in biofloc technology? a) To provide additional nutrients for the
aquatic organisms b) To control the pH of the culture tanks c) To enhance the
growth of beneficial microbial communities d) To reduce the need for water
treatment systems
Answer:
c
12.
What is the
typical size range of biofloc particles? a) 1-10 microns b) 10-100 microns c)
100-1000 microns d) 1000-10,000 microns
Answer:
b
13.
What is the
purpose of using paddlewheels in biofloc culture tanks? a) To control the
temperature of the water b) To distribute oxygen throughout the water c) To mix
the water and promote microbial growth d) To remove contaminants from the water
Answer:
c
14. Which of the
following is a disadvantage of using biofloc technology? a) Increased reliance
on antibiotics b) Higher energy costs c) Increased use of chemical fertilizers
d) Higher water usage
Answer:
b
15. What is the
primary benefit of using biofloc technology in aquaculture? a) Increased yield
b) Reduced water usage c) Improved taste of the fish or shrimp d) Reduced cost
of production
Answer:
b
16. What is the purpose of adding carbon sources
to biofloc culture tanks? a) To provide additional nutrients for the aquatic
organisms b) To control the pH of the culture tanks c) To enhance the growth of
beneficial microbial communities d) To reduce the need for water treatment
systems
Answer:
c
17. What is the
typical salinity range for biofloc culture tanks? a) Freshwater b) Brackish
water c) Saltwater d) Any salinity level is suitable
Answer:
b
18. What is the role
of heterotrophic bacteria in biofloc technology? a) To convert ammonia into
nitrate b) To convert nitrate into nitrogen gas c) To break down organic matter
and convert it into microbial biomass d) To produce oxygen through
photosynthesis
Answer:
c
19. Which of the
following is a common biofloc species? a) Bacillus subtilis b) Vibrio
parahaemolyticus c) Staphylococcus aureus d) Pseudomonas aeruginosa
Answer:
a
20. What is the
primary disadvantage of using biofloc technology in cold water environments? a)
Poor water quality b) Reduced microbial activity c) Increased energy costs d)
Higher mortality rates among aquatic organisms
Answer:
b
21. What is the role
of aeration in biofloc culture tanks? a) To distribute oxygen throughout the
water b) To control the temperature of the water c) To promote the growth of
beneficial bacteria d) To remove contaminants from the water
Answer:
a
22.
Which of the
following is a factor that can affect the quality of biofloc? a) Water
temperature b) Amount of sunlight c) Nutrient concentration d) All of the above
Answer:
d
23. What is the
primary factor that determines the size of biofloc particles? a) Water
temperature b) Nutrient concentration c) Aeration rate d) Water flow rate
Answer:
b
24. What is the
ideal carbon-to-nitrogen ratio for biofloc systems? a) 5:1 b) 10:1 c) 15:1 d)
20:1
Answer:
c
25. Which of the
following is a benefit of using biofloc technology in shrimp farming? a)
Reduced incidence of disease b) Increased reliance on antibiotics c) Reduced
energy costs d) Increased need for chemical fertilizers
Answer:
a
26. What is the
primary source of nitrogen in biofloc systems? a) Ammonia b) Nitrate c) Nitrite
d) Organic matter
Answer:
a
27. What is the role
of phytoplankton in biofloc systems? a) To control the pH of the culture tanks
b) To provide additional nutrients for the aquatic organisms c) To compete with
heterotrophic bacteria for nutrients d) To break down organic matter and
convert it into microbial biomass
Answer:
b
28. What is the
typical dissolved oxygen level in biofloc culture tanks? a) Less than 1 mg/L b)
1-3 mg/L c) 3-5 mg/L d) Greater than 5 mg/L
Answer:
c
29. What is the
primary benefit of using biofloc technology in fish farming? a) Improved growth
rates b) Reduced incidence of disease c) Improved water quality d) Increased
reliance on antibiotics
Answer:
c
30. Which of the
following is a common type of biofloc reactor? a) Stirred-tank reactor b)
Membrane reactor c) Bioreactor d) Photobioreactor
Answer:
a
31. What is the role
of microbial flocs in biofloc systems? a) To consume excess nutrients and
maintain water quality b) To provide a food source for the aquatic organisms c)
To control the pH of the culture tanks d) To reduce the need for water treatment
systems
Answer:
a
32. What is the
optimal temperature range for biofloc systems? a) 10-15°C b) 20-25°C c) 30-35°C
d) 40-45°C
Answer:
b
33. What is the
primary source of carbon in biofloc systems? a) Algae b) Organic matter c)
Atmospheric carbon dioxide d) Chemical fertilizers
Answer:
b
34. Which of the
following is a disadvantage of using biofloc technology in aquaculture? a)
Reduced energy costs b) Increased reliance on antibiotics c) Higher water usage
d) Reduced yield
Answer:
d
35. What is the
purpose of adding calcium carbonate to biofloc culture tanks? a) To control the
pH of the water b) To provide a substrate for bacterial attachment c) To
provide additional nutrients for the aquatic organisms d) To increase the
salinity of the water
Answer:
a
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