I'm thinking about investing in blockchain on Stock exchange.
How do you plan on doing so? Is there any asset that signifies the blockchain itself. I think you don't understand what blockchain is.
Will blockchain stand when cryptocurrency falls?
The blockchain will be there even if every currency falls down because it is a network and not an asset/commodity. Blockchain cannot go down or up but it can only grow. It is a newtork where all the blocks that represents transactions are stored. Find out a good video on youtube that explains about blockchain and crypto currency before putting up any question like this.