Yes, you can open a trading account using a joint bank account. But, you have to keep a few things in mind before opening a trading account.
There are no restrictions in linking your trading account with a joint bank account. However, you need to be part of the joint account and need to mention this while you are linking your trading account or opening a trading account.
Yes, you can. However, keep in mind that you need to mention this while opening a Demat account.