What would happen if poultry birds are larger in size and have no summer adaptation capacity? In order to get small-sized poultry birds having summer adaptability,what method will be employed?

Jessica saw her mother rotating a milk churner in a container of milk. She was surprised and asked her mother why she was doing that. Her mother smiled and explained that she was separating cream from milk,which would be used in various dishes.
$(a)$ What kind of qualities are shown by Jessica's mother?
$(b)$ How is cream easily separated from milk by a milk churner?

Why is there a need for varietal improvement?

In India,about $45 \%$ of the cultivated area is unirrigated,and scarce rainfall often causes crop failure,leading to drought-like conditions. This situation motivated villagers to use rainwater harvesting and watershed management.
$(i)$ What is meant by irrigation?
$(ii)$ List two different kinds of irrigation systems which can be adopted to supply water to agricultural land.
$(iii)$ What values does Rajan possess which helped villagers overcome their problem?

Discuss the role of hybridisation in crop improvement.

Differentiate between the following:
$(i)$ Capture fishery and Culture fishery
$(ii)$ Mixed cropping and Intercropping
$(iii)$ Bee keeping and Poultry farming