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: Solar panels actually comprise many, smaller units called photovoltaic cells. Photovoltaic simply means they convert sunlight into electricity.). Many cells linked together make up a solar panel. Each photovoltaic cell is basically a sandwich made up of two slices of semi-conducting material, usually silicon : . Manufacturers "dope" silicon with other materials, giving each slice of the sandwich a positive or negative electrical charge. This adds extra electrons, with a negative charge, to that layer. Meanwhile, the bottom layer gets a dose of boron, which results in fewer electrons, or a positive charge. This all adds up to an electric field at the junction between the silicon layers. When a photon of sunlight knocks an electron free, the electric field will push that electron out of the silicon junction. A couple of other components of the cell turn these electrons into usable power. 

SOLUTION: How does a solar panel work?

PROBLEM: The coal is pulverized to a very fine powder. The coal powder is mixed with hot air and blown into the firebox of the boiler. Water pumped through pipes inside the boiler is turned into steam by the heat. The pressure of the steam pushing against a series of giant blades turns the turbine shaft. Turbine shaft is connected to the shaft of the generator. The magnets inside the generator spin within wire coils to produce electricity. 

SOLUTION: How does a coal-powered power station generate electricity?

PROBLEM: Humans are born as babies. Babies become infants. Infants become children. Children learn skills. Children become teenagers. Teenagers undergo puberty. Teenagers become adults. Adults have children. Adults become elderly. Elderly humans die. 

SOLUTION:
Describe the life cycle of a human

