TASK DEFINITION: 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. 
PROBLEM: Adult mushrooms produce spores. Release them into the air by process of sporulation. Spores are carried by the wind. Land in a hospitable growing environment. The spores germinate into the soil. The mushroom starts growing. The adult mushroom produce spores of its own to repeat the process. 

SOLUTION: Describe the life cycle of a mushroom.

PROBLEM: An eagle flys along. The eagle spots a mouse on the ground. The eagle swoops down. Catches the mouse in its talons. The eagle has a meal. 

SOLUTION: How does an eagle get food?

PROBLEM: Solution caves are formed in limestone and similar rocks by the action of water. After a rain, water seeps into cracks and pores of soil and rock. The water percolates beneath the land surface. Some of the water reaches a zone where all the cracks and pores in the rock are already filled with water. Rainwater absorbs some carbon dioxide as it passes through the atmosphere and even more as it drains through soil and decaying vegetation. The water combines chemically with the carbon dioxide. A weak carbonic acid solution is formed. This acid slowly dissolves calcite, forms solution cavities, and excavates passageways. 

SOLUTION:
Describe the process of desalination