The key to 1 and 2 is to carefully go through the relevant law, explain it and then apply to the facts.
1. The facts suggest that some parties want to remove Meena and appoint Jayant.
What do you need to do to appoint Directors? How to remove them?
There are clear provisions in the Companies Act which deal with how you appoint and remove directors. Apply them to the facts - do the parties wanting to remove/appoint have the necessary board or shareholder votes?
2. Same here - what needs to happen to amend the Articles? Special Resolution. How do you pass a Special Resolution? 75% of the voting shares. Do Kapil and Ram have 75% of the shares? No they don't.
3. This is a bit more difficult. You could have provisions limiting the size of the board, who may be director and you could have supermajority provisions requiring a more stringent vote to appoint or remove directors. You could also have provisions restricting share transfers to non-family members. You may be able to come up with other ideas.
I can't over emphasise how important it is to look at the actual provisions of the Companies Act. Don't just read textbooks, you NEED to find the relevant Companies Act provisions - the answers are in the Act.