How can genetically modified crops be obtained?

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?

What is pasturage and how is it related to honey production?

What is mariculture and aquaculture?

Poultry fowl are susceptible to the following pathogens:

Why is there a need for varietal improvement?