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

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

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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. To turn over a new leaf

To change completely one's course of action
To change the old habits and adopt new ones
To shift attention to new problems after having studied the old ones thoroughly
To cover up one's fault by wearing new marks

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