What are fertilizers? Excess use of fertilizers is not advisable. Explain?

What is fertilization?

The use of fertilizers in farming is an example of

Why are manure and fertilizers used in fields?

What is true in the process of fertilization?

Fertilization in frog is

[A]: Due to excessive use of fertilizers, the available water to the plants becomes hypo- tonic in relation to cell sap. [R]: The water molecules, as a result, diffuse out of the cells due to endosmosis.

Define fertilization in angiosperms.