Sea Dwelling Species UPSC Questions

General Issues on Environmental Ecology, Bio-diversity & Climate Change

Sea Dwelling Species MCQ Questions


7.
Which factor does NOT directly affect phytoplankton biodiversity?
A.
Light
B.
Iron
C.
Temperature
D.
Wind speed
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ANSWER :
D. Wind speed
8.
Which nutrient is required in significant amounts by diatoms?
A.
Calcium
B.
Silicate
C.
Magnesium
D.
Sulphate
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ANSWER :
B. Silicate
9.
Why is iron important for phytoplankton?
A.
It helps in locomotion
B.
It supports respiration
C.
It limits their growth in many ocean areas
D.
It is required for digestion
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ANSWER :
C. It limits their growth in many ocean areas
10.
Where are the highest concentrations of marine phytoplankton found?
A.
Tropics
B.
Equator
C.
High latitudes and upwelling areas
D.
Desert regions
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ANSWER :
C. High latitudes and upwelling areas
11.
What is the euphotic zone?
A.
The deep ocean trench
B.
Upper water layer with sufficient sunlight
C.
Ocean floor
D.
Area with no light
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ANSWER :
B. Upper water layer with sufficient sunlight
12.
What role do phytoplanktons play in the aquatic food web?
A.
Primary producers feeding the entire web
B.
Secondary consumers
C.
Top predators
D.
Detritivores
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ANSWER :
A. Primary producers feeding the entire web