Dear P G:

You wrote:
> I am confused. Here is one sentence…
> “A Bunch of Scientists ____ (is/are) discussing the
> results of the experiment.”
>
> Which is the correct verb to be used ? Is there any
> special consideration because of the word
> ‘Scientists’?
> Kindly help regarding this.
>
> Thank you.
>
This is something grammarians have quibbled over for a long time. The problem comes with the collective noun. In the U.K. standard practice is to treat collective nouns as plural, e.g., “the government are investigating.” In North America, the standard practice to treat collective nouns as singular, e.g. “the government is investigating.” In practice, the North Americans often follow the British if the collective noun is followed by a preposition with a plural object.

This sounds wishy-washy, but either usage is OK, and in everyday speech you will probably hear “are” more than “is” when you have a “bunch” of people or objects.