Microalgal Biotechnology Questions and Answers

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

1. __________________ of algal biomass produces biomethane.
a) Distillation
b) Solid-state fermentation
c) Aerobic digestion
d) Anaerobic digestion.
View Answer

Answer: d
Explanation: The steps in biomethane production from algal biomass proceed in the following way – algal culture production, algal culture harvesting, algal culture dewatering, and finally anaerobic digestion.

2. Slurry obtained from harvesting algal biomass is ___________________
a) used as biofertilizer
b) toxic
c) discarded
d) recirculated
View Answer

Answer: a
Explanation: During anaerobic digestion of dewatered algal culture, slurry obtained can be used as a biofertilizer. The water used during the process is also recycled hence keeping in check the associated environmental concerns.

3. Chlamydomonas reinhartii has been used as a model for ______________
a) biohydrogen production
b) bioethanol production
c) infectious diseases
d) viral diseases
View Answer

Answer: a
Explanation: Chlamydomonas reinhartii is a green microalgae that proved to be a successful model for algal hydrogen (biohydrogen) production. It has been used to study photo-driven bio-H2 production from water, and other fermentative processes.

4. Hydrogen production does not accumulate in the culture.
a) True
b) False
View Answer

Answer: a
Explanation: Hydrogen production from microalgae culture does not accumulate in the culture rather it escapes readily into the gas phase. Therefore sophisticated instruments for processing are not required.

5. Choose the appropriate option.

1. Batch feeding a. autotrophic algae
2. CO2 enrichment b. heterotrophic algae

a) 1-b, 2-a
b) 1-a, 2-b
c) 1-a, 2-a
d) 1-b, 2-b
View Answer

Answer: a
Explanation: Attaining maximal growth and hence adequate biomass is required for a sustainable biofuels production. For heterotrophic algae batch feeding is a method to do so while carbon dioxide is used for autotrophic algae.

6. Maintenance of constant _________________ is required during algal culture.
a) turbidity
b) pH
c) phosphorus content
d) magnesium content
View Answer

Answer: b
Explanation: Maintenance of constant pH is required during microalgae culture since it affects all other processes linked to media utilization and growth. Potential of hydrogen (pH) is a measure of acidity or alkalinity of the water.

7. Raceway systems are _____________________
a) not used for microalgae
b) better than open ponds
c) low yielding
d) expensive to construct
View Answer

Answer: d
Explanation: Most popular production systems for a microalgae culture are open ponds and raceways. While the former has geographical constraints, the latter is expensive to construct because of sophisticated setup and transparent construction material requirement.

8. The popular name of Arthrospira maxima is ___________________
a) dunaliella
b) spirulina
c) seaweed
d) chlamydomonas
View Answer

Answer: b
Explanation: Popularly known as spirulina, the cyanobacteria Arthrospira maxima or platensis is known taken as a nutritional supplement. It was a major part of Mexican Aztec population’s diet.

9. Isochrysis galbana – a microalgae used as animal feed is rich in _________________
a) fatty acids
b) lipids
c) carbohydrates
d) proteins
View Answer

Answer: a
Explanation: Isochrysis galbana is a species of haptophyta containing high amounts of fucoxanthin and is widely used as feed in the aquaculture of bivalve mollusks. It is a unicellular organism containing a high fatty acid content.

10. Choose the appropriate option.

Microalgae species Application
1. Chlorella vulgaris a. food supplement
2. Lyngbya majuscule b. cosmetics
3. Odontella aurita c. Pharmaceuticals

a) 1-a, 2-c, 3-b
b) 1-a, 2-b, 3-c
c) 1-c, 2-b, 3-a
d) 1-b, 2- a, 3-c
View Answer

Answer: a
Explanation: Besides biofuel and biogas production, various species of microalgae serve diverse roles in the biotechnology industry. Depending upon their cell characteristics and storage compounds microalgae species are employed in nutrition, pharmaceutical, and cosmetic industry.

11. Only plants and algae are able to synthesize omega-3 fatty acids.
a) True
b) False
View Answer

Answer: a
Explanation: Polyunsaturated fatty acids (PUFAs) are vital for growth of higher eukaryotes (such as humans) and provide such other health benefits as reducing cardiac diseases, rheumatoid arthritis.

12. For which of the following, microalgae is not used as a live feed?
a) Copepods
b) Rotifers
c) Artemia
d) Dunaliella
View Answer

Answer: c
Explanation: Dunaliella salina is a halophile green microalga taken as food supplement that contains high amounts of β-carotenoids. Artemia, rotifers and copepods are zooplanktons for the production of which microalgae are used as live feeds.

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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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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