Shrimp Aquaculture Questions and Answers – Set 2

This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Shrimp Aquaculture – Set 2”.

1. Bacillus is used as a probiotic because it produces exoenzymes.
a) True
b) False
View Answer

Answer: a
Explanation: Bacillus species are a common probiotic used in aquaculture because of their ability to produce exoenzymes such as amylase, protease, and lipase among others. These provide a cumulative effect in maintaining water quality and therefore shrimp health.

2. The green phototrophic bacteria is _____________
a) gram positive
b) gram-negative
c) oxygenic
d) pathogenic
View Answer

Answer: b
Explanation: Phototrophic bacteria are broadly classified as oxygenic and anoxygenic phototrophic bacteria. The anoxygenic phototrophic bacteria that do not evolve oxygen are further divided into green sulfur bacteria and purple sulfur bacteria.

3. Choose the appropriate option.

1. Green sulfur bacteria Photosynthetic pigments
2. Purple sulfur bacteria i. Bacteriochlorophylls a,c,d,e

ii. Bacteriochlorophyll a,b
Sulfur deposition
iii. inside of the cell
iv. outside of the cell

a) 1-I, 1-iv, 2-ii, 2-iii
b) 1-ii, 1-iii, 2-i, 2-iv
c) 1-iii, 1-iv, 2-ii, 2-i
d) 1-ii, 1-iv, 2-I, 2-iii
View Answer

Answer: a
Explanation: Green sulfur bacteria and purple sulfur bacteria are grouped into anoxygenic phototrophic bacteria. Sulfur is deposited outside the cell in green sulfur bacteria and inside the cell in purple sulfur bacteria.

4. Carotenoids in shrimp feed are important for _________________
a) pigmentation of the organism
b) alkalinity maintenance
c) antivibrio compound synthesis
d) antibiotic resistance
View Answer

Answer: a
Explanation: Carotenoids are sources of natural pigments in shrimp feed therefore these can greatly affect the color quality of the organism. This adds an additional factor in the cost of commercial shrimp feed.

5. Antimicrobial peptides of shrimp are produced and stored in __________________
a) Cortex
b) Hemocoel
c) Hemocytes
d) Paracortex
View Answer

Answer: c
Explanation: Antimicrobial peptides are the most important players of immune system in shrimps. These antimicrobial peptides are produced and stored in the hemocytes – immune cells of penaeid shrimps.

6. Cyanocobalamin is often added in shrimp feed.
a) True
b) False
View Answer

Answer: a
Explanation: Cyanocobalamin or vitamin B12 is added as a supplement in shrimp feed to promote growth and color intensity of the organism. It is also essential for human beings and certain species of sulfide oxidizing bacteria.

7. Select the correct option.

1. Reactive oxygen species a. hydrogen peroxide
2. Anti-oxidant defense b. superoxide anion
c. glutathione
d. ascorbic acid

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

Answer: a
Explanation: All vertebrates and invertebrates invariably produce reactive oxygen species (ROS) such as hydrogen peroxide and superoxide anion in response to environmental stress. Anti-oxidant defenses towards elevated ROS involve production of molecules such as glutathione and ascorbic acid.

8. Choose the correct option about cells.

1. B-cells i. cuboidal, found in distal parts
2. F-cells ii. contain small lipid vacuoles
3. R-cells iii. show fibrillar appearance
4. E-cells iv. largest, located in distal part

a) 1-iv, 2-iii, 3-ii, 4-i
b) 1-i, 2-ii, 3-iii, 4-iv
c) 1-ii, 2-iv, 3-i, 4-iii
d) 1-iii, 2-i, 3-iv, 4-ii
View Answer

Answer: a
Explanation: There are 4 types of cells in lumen of shrimp hepatopancreas (HP) namely the B-, F-, R-, and E-cells. Symptoms of early mortality syndrome (EMS) or acute hepatopancreas necrosis disease include changes in morphology of HP cells.

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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