WorksheetsMicroalgae and Aquatic Ecosystems Quiz
Total questions: 15
Worksheet time: 8mins
What is the primary role of microalgae in aquatic ecosystems?
Decompose organic waste
Produce oxygen and form the base of aquatic food webs
Consume carbon dioxide through respiration
Feed on other microorganisms
Which cultivation route does NOT require light?
Autotrophic
Mixotrophic
Heterotrophic
Phototrophic
In microalgae growth, the most productive phase for biomass production is:
Lag phase
Exponential (log) phase
Stationary phase
Death phase
Which light wavelength is most efficient for photosynthetic carbon fixation in microalgae?
Green
Blue
Red
UV
What is a common challenge of using carbon dioxide‚ in algal cultivation?
Excess light exposure
Nutrient limitation
Acid stress from low pH
Oxygen accumulation
Which of the following is a co-benefit of using microalgae in aquaculture wastewater treatment?
Increased feed import costs
Production of usable biomass for feed
Reduced algal oxygen output
Decreased nutrient availability for fish
Which bioreactor design is typically more controlled and closed?
Circular pond
Raceway pond
Flat-panel PBR
Natural lake
Microalgae remove nitrogen and phosphorus from wastewater primarily by:
Chemical precipitation
Passive adsorption
Uptake into biomass
Volatilization
What pigment is widely extracted from Haematococcus pluvialis?
Chlorophyll b
Lutein
Phycocyanin
Astaxanthin
One benefit of algae-based feed in aquaculture is:
Reduced protein content
Higher carbon emissions
Improved immune response
Increased disease outbreaks
Photoinhibition occurs when:
Light intensity is too low
There is insufficient carbon dioxide‚
Excess light damages Photosystem II
There are too many nutrients
Which algae is commonly used for natural antioxidant production?
Spirulina platensis
Cladophora glomerata
Ulva lactuca
Phaeodactylum tricornutum
Microalgal biomass used as aquafeed is rich in:
Carbohydrates and sodium
Proteins and omega-3 fatty acids
Fats and calcium
Fiber and sugar
Which nutrient limitation can trigger lipid accumulation in microalgae?
Phosphorus
Iron
Nitrogen
Calcium
The integration of microalgae in aquaculture supports:
Increased eutrophication
Higher feed costs
Circular nutrient cycling
More chemical usage
