This set of Marine Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Marine Algal Biotechnology – Set 5”.
1. In the pond culture of Gracilaria, which is a measure of modifying temperature?
a) Water depth
b) Pond site
c) Sediment composition
d) pH
View Answer
Explanation: Gracilaria is red algae cultivated in ponds in large scale only in China and Taiwan. Water depth is usually used as a method to modify the water temperature; for instance during summer the water depth is increase by 50-60 cm.
2. The pH level of algal pond culture for Gracillaria is 7.3-8.
a) True
b) False
View Answer
Explanation: The pH level for Gracillaria pond culture is slightly alkaline. The water exchanges are made every 2 -3 days to adjust the salinity and mineral nutrient supplies for algal growth.
3. Limitation of _________ in micro-algal culturing leads to discoloration of the cells.
a) Carbon
b) Nitogen
c) Oxygen
d) Potassium
View Answer
Explanation: Limitation of nitrogen leads to discoloration of cells due to decrease in chlorophyll and increase in carotenoids. It also leads to accumulation of polysaccharides and polyunsaturated fatty acids.
4. Which is a potential productivity indicator in a micro-algal culture?
a) N:P
b) C:N
c) C:S
d) C:O
View Answer
Explanation: The ratio of phosphorus and nitrogen is a potential indicator of productivity in a micro-algal culture. It also indicates the dominance of the desired (candidate species) in the culture. Phosphorus constitutes 1% of the algal biomass.
5. Silicon limitation can lead to _________
a) secondary metabolite accumulation
b) primary metabolite accumulation
c) rise in alkalinity
d) rise in acidity
View Answer
Explanation: Silicon is present in the cell walls of many divisions of algae for instance the diatoms. Besides it is also an essential nutrient for growth, and limitation can lead to accumulation of secondary metabolites.
6. What is the usual light intensity used for micro-algal cultures?
a) 20-50 μE/sec/m2
b) 75-100 μE/sec/m2
c) 100-150 μE/sec/m2
d) 100-200 μE/sec/m2
View Answer
Explanation: The usual light intensity used for culturing micro-algae in-vitro is 100-200 μE/sec/m2, which is corresponding to 5 – 10% of full daylight. The light intensity depends on type of algae as well as the concentration.
7. Dark reactions of photosynthesis lead to the synthesis of _________
a) lipids
b) oxygen
c) amino acids
d) carbohydrates
View Answer
Explanation: In the process of photosynthesis there are two distinct reactions taking place depending upon the illumination received by the phototrophs. The dark reactions lead to synthesis of carbohydrates.
8. Oceanic species of algae take longer to grow in agar plates.
a) True
b) False
View Answer
Explanation: Soil and freshwater algae take several days to grow as colonies on streaked agar plates. Oceanic species of algae however can take longer – a few months to show up as sizeable colonies.
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.
