Poultry farming is undertaken to raise the following:
$(i)$ Egg production
$(ii)$ Feather production
$(iii)$ Chicken meat
$(iv)$ Milk production

Find out the correct sentence:
$(i)$ Hybridisation means crossing between genetically dissimilar plants.
$(ii)$ Cross between two varieties is called as interspecific hybridisation.
$(iii)$ Introducing genes of desired character into a plant gives genetically modified crop.
$(iv)$ Cross between plants of two species is called as inter-varietal hybridisation.

Why should biological control methods be preferred for protecting crops?

What do you mean by:
$(a)$ Blue revolution?
$(b)$ Yellow revolution?

Name any one method of incorporating desirable characters into a crop variety.

"Different ways of growing crops can be used to give maximum benefit from crop production management." Explain any three techniques.