In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 

Ex Input:
Bacteria changes nitrogen into ammonium through fixation. The nitrification process is where ammonium gets changed into nitrates by bacteria. Plants absorb the nitrates from soil into their roots through assimilation. When plants die, fungi and bacteria turn nitrogen back into ammonium through ammonification. The denitrification process pushes extra nitrogen from soil into the air. The cycle repeats from step 1. 

Ex Output:
Describe the nitrogen cycle


Ex Input:
A plant dies. Bacteria from the ground migrate to the plant material. Bacteria release enzymes onto the plant material. The enzymes break down the plant cells to simpler components. The bacteria absorb the resulting components. 

Ex Output:
How do bacteria break down dead plants?


Ex Input:
Coal is burned at a furnace. The resulting heat energy is used to heat water. The heated water is turned into steam. The steam drives a generator. Electricity is produced. 

Ex Output:

How does a coal-powered power station generate electricity?