Marine Biotechnology Questions and Answers – Aquaculture Environmental Effects

This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Aquaculture Environmental Effects”.

1. Which is the most effective in phosphate production and solubilizing?
a) Micrococcus
b) Pseudomonas
c) Rhodopseudomonas
d) Bacillus
View Answer

Answer: d
Explanation: Amongst microbes Bacillus is the most efficient in phosphate solubilization. Many chemolithotrophic microorganisms produce nitrous and sulfuric acids during inorganic phosphate mobilization.

2. Daytime pH in ponds can be high due to algal metabolism.
a) True
b) False
View Answer

Answer: a
Explanation: High pH during daytime specifically due to algal metabolism leads to precipitation of phosphorus in bottom sludge. The precipitation is in the form of hydroxyapatite, tricalcium phosphate, and other insoluble complexes.

3. Which has a bio-augmentation function?
a) Phosphate
b) Selenium
c) Fish slime
d) Nitrate
View Answer

Answer: c
Explanation: The green slime produced by fish is known to exert bioaugmentation effect and therefore elevating the dominance of beneficent bacteria. Incorporating fish in crustacean culture has been shown to improve the health off organisms.

4. Which of the following can be achieved through integrated multi-trophic aquaculture (IMTA)?
a) Biomitigation
b) Phycoremediation
c) Biostimulation
d) Bioaugmentation
View Answer

Answer: a
Explanation: By incorporating species from different trophic levels leads to consumption of wastes generated from one species by the other species. This is known as biomitigation by integrated multi-trophic aquaculture.

5. What is used in bagasse-assisted bioremediation?
a) Non-native microbes
b) Native microbes
c) Calcium carbonate
d) Plant based products
View Answer

Answer: d
Explanation: Plant-based products that stimulate the natural microflora of an aquaculture pond are used in bagasse-assisted bioremediation. These are potential enough to accelerate the natural detoxification of the system.

6. In green water technology _______________ is used for bioremediation.
a) finfish
b) shellfish
c) shrimp
d) bacteria
View Answer

Answer: a
Explanation: In green water technology finfish are maintained in cages in a shellfish (shrimp) culture pond. Finfish feed on uneaten feed and algae while producing protein-rich slime that enhances the production of green water.

7. ____________ is an assemblage of microorganisms on a surface that increases productivity of the ponds.
a) Biofilm
b) Consortium
c) Seaweed
d) Pen-cage
View Answer

Answer: a
Explanation: Biofilm is an assemblage of microorganisms on a surface, also known as periphyton, that increase the net productivity of an aquaculture pond system. This is because there is an addition of catabolic genes

8. _______________ used in water have cage-like structure.
a) Denitrifiers
b) Nitrifiers
c) Biofloc
d) Zeolites
View Answer

Answer: d
Explanation: Zeolites are cage-like structures consisting of SiO4 and AlO4, having high cation exchange capacity, microporous and crystalline solid nature. These are increasingly used in water treatment and aquaculture remediation.

9. Bagasse is a cellulosic fibrous waste.
a) True
b) False
View Answer

Answer: a
Explanation: Bagasse is a fibrous waste composed majorly of cellulose, derived from sugarcane after juice has been extracted. It acts as a substrate for biofilm formation by various bacteria that accelerate bioremediation in the pond.

10. Endosulfan is a ___________________
a) nanoparticle
b) pesticide
c) polysaccharide
d) microorganism
View Answer

Answer: b
Explanation: Endosulfan is an organochlorine compound used extensively as a pesticide in agriculture. Upon ingestion by the fish it blocks the neuronal GABA-gated chlorine channels exerting an overall neurotoxic effect.

11. Which is a low cost waste water treatment technique?
a) Cavitation
b) Advanced oxidation processes
c) UV irradiation
d) Gamma-rays irradiation:
View Answer

Answer: a
Explanation: Cavitation is a low cost wastewater treatment process that generates bubbles in the bulk volume of wastewater. When the bubbles collapse, surrounding water splits into hydrogen and hydronium ions. The H3O+ lead to oxidization of various chemical and organic species present in the vicinity, thereby degrading the microbial cells.

12. High rate algal pond systems are used for _________________
a) treatment of waste water
b) larval hatching
c) shrimp maturation
d) fish breeding
View Answer

Answer: a
Explanation: High rate algal ponds (HRAPs) are used to treat wastewater originating from various sources such as commercial, industrial and sanitary. The ponds harbor various algal species which grow exuberantly in the wastewater and accumulate the nutrients from it into algal biomass.

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.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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