Answer:
(c) Fertilizers are manufactured by using
chemicals. They supply nitrogen, phosphorus and potassium (NPK). They are used
for good vegetative growth, (i.e., growth of leaves, branches and flowers). Giving
rise to healthy plants is commercially one of the major components for
obtaining higher yields, especially in expensive farming practices, Fertilizers
contain much higher amount of nutrients in comparison to the manures and are,
therefore, used in very small quantities. Chemically they may be inorganic compounds,
(e.g., ammonium sulphate) or organic compounds (e.g., urea).
On the basis of the availability of nutrients from them, fertilizers
are divided into following four groups
(i) Nitrogenous fertilizers These fertilizers
supply the macronutrient nitrogen.
Examples of nitrogenous fertilizers are Urea 
ammonium
nitrate 
(ii) Phosphatic fertilizers They are the source of
the macronutrient phosphorus.
Examples of phosphatic fertilisers are dicalcium
phosphate.
(iii) Potassic fertilizers These fertilizers supply
potassium which is one of the essential macronutrient of the plants. Examples
of potassic fertilisers are; potash or potassium chloride (KCI); Potassium
nitrate 
.
(iv) Complex fertilizers When a fertilizer contains
atleast two or more nutrients 
,
it is called complex fertilizer.
Examples of complex fertilisers are
(i) Nitro phosphate
(ii) Ammonium phosphate
(iii) Urea ammonium phosphate
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