Related Questions

Which is the National Aquatic Animal of India?
A Penguin
B Whale
C River Dolphin
D Seal
Which of the following organisms fix nitrogen in aquatic ecosystems?
A Fungi
B Chemoautotrophs
C Cyanobacteria
D Phytoplankton
Which of the following aquatic plant is effective in preventing the water-pollution caused by industrial waste?
A Water Hyacinth
B Elephant Grass
C Parthenium
D B and C
Which type of permanent tissue helps the aquatic plants to float?
A Aerenchyma
B Collenchyma
C Sclerenchyma
D No option is correct
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A 1 ppm
B 4 ppm
C 10 ppm
D 40 ppm
In an aquatic ecosystem, the depth to which light penetrates is called
A aphotic
B photic
C euphotic
D nonphotic
The word 'aquatic refers to-
A fertile
B terrestrial
C small
D marine
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A 0.5
B 1
C 5
D 20
Presence of __________ in water stream are deleterious to aquatic life.
A Soluble and toxic organics
B Suspended solids
C Heavy metals and cynides
D All of the above
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
A 10000
B 5
C 500
D 1000

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