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Discuss various methods for weed control.
 
a. An unwanted plant species that grows spontaneously in a habitat, including cultivated fields, is known as a ______.
 
b. The major types of weeds commonly found in our crop field is ________________.
 
c. Weeds are removed manually by pulling out individual plants, which is known as ____________.
 
d. The mechanical agitation of soil, including overturning, to eliminate weeds and reduce their seeds in the soil, known as ___________.
 
e. A commonly used method for handling perennial weeds is flooding fields after the harvest is known as ____________.