This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Wastewater Management through Aquaculture – Set 2”.
1. Filter feeders can be used to improve water quality in aquaculture.
a) True
b) False
View Answer
Explanation: Filter feeders such as oysters, clams, mussels use the natural organics and nutrients from the water thereby greatly reducing its organic load. Filter feeders have therefore been used in many aquaculture systems such as IMTA to ameliorate the water quality issues.
2. Which is not a category of probiotics used in aquaculture?
a) Hormonal probiotics
b) Water probiotics
c) Soil probiotics
d) Feed probiotics
View Answer
Explanation: Hormonal probiotics are not used in aquaculture whereas probiotics for microbiome improvement, water probiotics, pond probiotics are commonly used to better the health of culture organisms.
3. Addition of rotifers in aquaculture increases water transparency.
a) True
b) False
View Answer
Explanation: Rotifers, also called wheel animals are microscopic pseudocoelomate animals. The usual diet of rotifers consists of dead/ decomposing organic matter, unicellular algae and other phytoplanktonic forms. Rotifers have been reported to decrease turbidity in water.
4. While fertilizers ___________ lime poses ______________ to water bodies in the vicinity.
a) increase nutrient loads, no harm
b) do not harm, risks
c) alter soil chemistry, additional risk
d) increase H2S levels, no risk
View Answer
Explanation: Fertilizers are used commonly in agriculture as well as aquaculture and greatly alter the soil chemistry as well as add nutrients to water bodies leading to eutrophication. Lime on the other hand does not pose any risk on the water bodies.
5. Choose the appropriate option.
| Threat | Hazard |
|---|---|
| 1. Water quality | a. Stock enhancement |
| 2. Genetic | b. Effluents |
| 3. Ecology | c. Salinization |
a) 1-a, 2-b, 3-c
b) 1-b, 2-a, 3-c
c) 1-c, 2-a, 3-b
d) 1-a, 2-c, 3-b
View Answer
Explanation: Aquaculture poses a variety of threats to the environment such as genetic, water quality deterioration, ecological, health etc. different threats impose different hazards associated with risks and environmental imbalance.
6. Choose the correct option.
| Hazard | Risk |
|---|---|
| 1. Effluent discharge | a. eutrophication |
| 2. Use of antibiotics | b. resistance |
| 3. Use of chemicals | c. bioaccumulation |
a) 1-a, 2-b, 3-c
b) 1-b, 2-a, 3-c
c) 1-c, 2-b, 3-a
d) 1-c, 2-a, 3-b
View Answer
Explanation: Various environmental threats lead to distinguished hazards and risks associated with threats imposed by the aquaculture systems. Effluent discharge leads to eutrophication in surrounding waters when the concentration of organic load is very high. Similarly unjustified use of antibiotics and chemicals leads to antibiotic resistance and bioaccumulation respectively.
7. Very high organic load in the aquaculture effluent wastewater leads to a condition of ______________
a) bioaccumulation
b) keystone species extinction
c) fish mortality
d) anaerobiosis
View Answer
Explanation: Very high organic loads in the aquaculture effluent leads to increase in total organic solids, total inorganic matter, and other water quality parameters. This leads to high level of microbial activity resulting in lower dissolved oxygen concentration and therefore anaerobiosis.
8. Which of the following bacterial species usually occur together?
a) Salmonella, Bacillus
b) Purple sulfur bacteria, green sulfur bacteria
c) Actinomycetes, purple sulfur bacteria
d) Sulfur oxidizing bacteria, thiobacteria
View Answer
Explanation: Sulfur oxidizing bacteria (SOB) most often occurs together with thiobacteria in polluted anoxygenic water bodies. The SOB forms a mat on soil surface acting as a filter preventing escape of hydrogen sulfide in overlying water column.
Sanfoundry Global Education & Learning Series – Marine Biotechnology.
To practice all areas of Marine Biotechnology, here is complete set of 1000+ Multiple Choice Questions and Answers.
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