CLASS-XII
REVISION
TEST
BIODIVERSITY
& CONSERVATION
ENVIRONMENTAL
ISSUES
Q.(1) Why is Eichhornia crassipes nick named as
“Terror of Bengal”? (1)
Q.(2) How do algal blooms affect the life in water
bodies? (1)
Q.(3) Name the two most biodiversity rich zones of
India. (1)
Q.(4) Justify
with an example where a deliberate attempt by humans has led to the extinction
of a particular species. (2)
Q.(5) Explain,
giving one example, how co-extinction is one of the causes of loss of
biodiversity, list the two other causes also (without description). (2)
Q.(6) A crane
had DDT as 5 PPM in its body. What would happen to the population of such
birds. Explain giving reasons.
(2)
Q.(7) Mention
how e-waste is produced and disposed off? Write the solution for its treatment.
(2)
Q.(8) Refrigerants
are considered to be a necessity in modern living, but are said to be
responsible for ozone holes detected in
Antartica justify.
(3)
Q.(9) (a) Explain the significance of Ecological
pyramids with the help of an example.
(b) Why are the pyramids referred to as
upright or invented. (3)
Q.(10) What are
sacred groves? Where are they found? What is their role in conservation? (3)
Q.(11) (a) Name the green house gases. How do they
affect life on earth? (2)
(b) Describe is detail the eutrophication of
a lake with example. (3)
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