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

Two friends,Girish and Neeraj,were discussing Newton's third law. They were perplexed about how action and reaction are equal and opposite. They could not think of an experiment by which they could ascertain this fact. Pushkar,who was their friend,told them that he would set up an experiment to prove this to them. By performing an experiment,Pushkar demonstrated the law.
$(a)$ Can you think of an experiment by which you can demonstrate this law?
$(b)$ What values do you think Pushkar has?

State two advantages of composite fish culture. What is the application of hormonal stimulation in fish culture?

Write three advantages of crops growing in shorter duration of time compared to those growing in longer duration of time.

Mention two factors which affect food grains during storage.

Discuss the role of hybridisation in crop improvement.