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

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

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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 M.P. from our constituency is fond of blowing his own trumpet whenever he gets a chance.

looking after his own interest
parading his own good deeds
making long speeches
speaking too loudly

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Idiom
To stand to one's guns

To persevere when hardships press
To maintain dignified and unbending attitude
To keep the guns close to oneself even amid danger
To maintain one's position

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