Identify the incorrect statement.

  • A
    Biologists at Humboldt State University developed a series of six connected marshes to remove heavy metals from water using plants,algae,fungi,and bacteria.
  • B
    'Ecosan' toilets are used in many parts of Kerala and Sri Lanka.
  • C
    Plastic waste is biodegradable.
  • D
    $E$-waste contains toxic substances.

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$R$: It is a practical and hygienic method of using dry composting toilets.

Match the columns:
Column-$I$Column-$II$
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$(4)$ Cadmium$(d)$ Skeletal fluorosis
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The Bhopal gas tragedy occurred in $1984$ because methyl isocyanate reacted with .......

How many sentences are correct?
$(1)$ $CNG$ burns most efficiently.
$(2)$ $CNG$ cannot be adulterated.
$(3)$ $CNG$ is cheaper than petrol and diesel.
$(4)$ In the $1990$s,Delhi ranked $4$th among the $41$ most polluted cities of the world.

Select the appropriate option for $FOAM$.

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