This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Bioremediation in Aquaculture – Set 2”.
1. ________________ are poor source of nutrition for detrivores such as shrimps.
a) Autotrophs
b) Heterotrophs
c) Rice bran
d) Rotifers
View Answer
Explanation: Autotrophs are a poor source of nutrition of detrivores as compared to hetetrophic bacteria, rice bran and rotifers. Autotrophs obtain energy from light and carbon from carbon dioxide.
2. Recirculating raceway systems use less land than the traditional ponds.
a) True
b) False
View Answer
Explanation: Recirculating raceway systems are used major for the aquaculture of shrimp and they occupy much less land than the traditional pond systems. Raceway systems can be built enclosed in greenhouses or in outdoors.
3. What can be added in raceway systems to increase nitrification rate?
a) Consortium
b) Lime
c) Molasses
d) Pesticides
View Answer
Explanation: Molasses are a source of carbon that stimulates the growth of heterotrophic bacteria. The nitrifying heterotrophic bacteria increase nitrogen uptake and aid in maintaining healthy ammonia levels.
4. _________________ is the fill-and-draw type of batch reactor used in raceways.
a) CSTR
b) SBR
c) SSBR
d) PCR
View Answer
Explanation: Sequencing batch reactor (SBR) is a type of fill-and-draw type of batch reactor. The water is in a single reactor basin where aeration, equalization, sedimentation and clarification are accomplished.
5. Which bacterial genera convert ammonia to nitrite as well as nitrite to nitrate?
a) Nitrobacter
b) Nitrosomonas
c) Nitrosovibrio
d) Nitrospira
View Answer
Explanation: Nitrification is a two-step process involving autotrophic as well as heterotrophic bacteria in the presence of oxygen. The conversion of ammonia to nitrite and nitrite to nitrate is done by Nitrospira.
6. Which is not associated with denitrification?
a) Autorophic bacteria
b) Heterotrophic bacteria
c) Anaerobic conditions
d) E.coli
View Answer
Explanation: To maintain lower levels of nitrate in aquaculture system, denitrification is instrumental. The process is accomplished by Pseudomonas denitrificans and E.coli under anaerobic conditions.
7. __________________ is the sum of all procedures to preclude living organisms from contracting and carrying the disease.
a) Bioremediation
b) Biosecurity
c) Vaccination
d) Prophylaxis
View Answer
Explanation: Biosecurity is the sum of all the procedures undertaken to prevent the living organisms (for instance in a aquaculture facility) from contracting and carrying disease/non-desirable health conditions.
8. The main vector for major shrimp pathogens is _________________
a) contaminated feed
b) temperature gradient
c) shrimp larvae
d) fish meal
View Answer
Explanation: The main vector of such major shrimp pathogens as Taura Syndrome Virus (TSV), White Spot Syndrome Virus (WSSV) etc. is the shrimp larvae. Specific pathogen free stocks are produced to counter the issue.
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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