Idiom
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

By cyanobacteria
By denitrification
By industrially synthesised fertilizer
By electrical discharges in the atmosphere

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. The recent film 'Secular India' has tried to keep the pot of Muslim women's Bill boiling.

to force the authorities to reconsider
keep the controversy alive
to earn enough support for
none of these

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Idiom
Mutation is

a change which affects the offspring of F2 generation only
a change which affects the parents
a change that is inherited
a factor responsible for plant growth

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