CBSE 12th Standard Biology Subject Biodiversity and Conservation HOT Questions 3 Marks Questions 2021
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CBSE 12th Standard Biology Subject Biodiversity and Conservation HOT Questions 3 Marks Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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What would be the impact on the environment around a thermal power plant if its electrostatic precipitator stops functioning? Give a reason.
(a) -
Microbes play a dual role when used for sewage treatment as they not only help to retrieve usable water but also generate fuel. Write in points how this happens?
(a) -
What are flocs? State their role in effluent treatment and their ultimate fate in sewage treatment tank.
(a) -
Create an aquatic food chain in a water body into which effluents flow from a pesticide factory. Diagrammatically represent and answer the following questions:
What is the phenomenon called?(a) -
Since the origin of life on earth and evolution there have been 5 episodes of mass extinction, but the current rate of extinction is 100-1000 times. What are the main causes of high extinction rate and how is it going to harm human beings?
(a)
3 Marks
