This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Aquaculture Probiotics”.
1. Litopenaeus vannamei can tolerate a wide range of salinity and temperature.
a) True
b) False
View Answer
Explanation: Litopenaeus vannamei a sea water species is commercially dominant in aquaculture to preclude white spot syndrome mortality that occurs in Penaeus monodon. Most of the probiotics developed are for shrimp aquaculture.
2. Which is not produced by purple non-sulfur bacteria?
a) Vitamin B12
b) Digestive enzymes
c) Humic acids
d) Anti-vibrio compounds
View Answer
Explanation: Humic acids are organic compounds that increase soil fertility thereby benefiting agriculture. Purple non-sulfur bacteria are used as probiotics and have been shown to produce vitamin B12, digestive enzymes and anti-vibrio compounds.
3. Which is a luminous marine bacterium?
a) Vibrio harveyii
b) Vibrio parahaemolyticus
c) Vibrio vulnificus
d) Vibrio splendidus
View Answer
Explanation: Vibrio harveyii is a marine luminous bacteria and most common agent of vibriosis in shrimp aquaculture. Many probiotics target this pathogen by secreting anti vibrio compounds following attachment in the GI tract of the animal.
4. Which of the following is banned for use in aquaculture?
a) Super PS
b) Chloramphenicol
c) Lactic acid bacteria
d) Purple non-sulfur bacteria
View Answer
Explanation: Chloramphenicol is an antibiotic banned for use in aquaculture since it can induce aplastic anemia in humans if residuals left in the culture are ingested by the consumer. In the past the drug has been popular to treat vibriosis and bacteremia.
5. Vibrio parahaemolyticus causes ________________ in post-larval shrimp.
a) AHPND
b) WSSV
c) Shigellosis
d) TMV
View Answer
Explanation: Vibrio parahaemolyticus is a pathogenic comma-shaped bacterium that causes Acute Hepatopancreatic Necrosis Disease (AHPND) in post-larval shrimp. The disease causes 100% mortality in no time.
6. PNSB can survive by phototrophic and chemotrophic modes of nutrition.
a) True
b) False
View Answer
Explanation: Purple non-sulfur bacteria are normally found in well-lit natural waters containing high loads of organic matter. Under light conditions phototrophic mode is utilized while under dark conditions chemotrophic mode of nutrition is made use of for survival.
7. Rhodocyclus, Rhodobacter, and Rhodopseudomonas are examples of ___________________
a) Heterotrophic bacteria
b) Protists
c) Parasites
d) Purple non-sulfur bacteria
View Answer
Explanation: Examples of purple non-sulfur bacteria include Rhodocyclus, Rhodobacter, Rhodopseudomonas, Rhodomicrobium, and Rhodopila. Purple non-sulfur bacteria are excellent bioremediators.
8. Neurosporene, lycopene, and okenone are examples of __________________
a) antiobiotics
b) anifungals
c) carotenoid pigments
d) antivibrio compounds
View Answer
Explanation: Neurosporene, lycopene, chloroxanthin, spirilloxanthin, and okenone are examples of carotenoid photosynthetic pigments. Addition of these in feeds result in stimulation of color of the aquatic animals.
9. Choose the appropriate option.
| 1. Juvenile | a. estuarine environment |
| 2. Postlarvae | b. marine environment |
| 3. Adult |
a) 1-a, 2-a, 3-a
b) 1-b, 2-b, 3-b
c) 1-a, 2-b, 3-a
d) 1-b, 2-a, 3-b
View Answer
Explanation: Postlarvae, juvenile, and adult are the life stages of Litopenaeus vannamei in chronological order. While postlarvae have optimum survival inshore and bottom of shallow estuaries, juvenile and adults move to marine environment.
10. Which is not a suitable condition for shrimp cultivation initiation?
a) 6-7 moth old adult shrimp
b) Weight more than 40 grams
c) Good environmental conditions
d) Harboring virus
View Answer
Explanation: For insuring appropriate and sustainable shrimp farming several measures must be taken. The adult male and female shrimp selected are 6 to 7 months old and over 40 grams. In addition the stock is pathogen free and able to tolerate slight environmental variations.
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.
