[Tuj] something the brain can do -- NOt strictly, although activity of the brain is usually required. *a smattering of claps from the audience*
[Inkspot] is the vegetable a plant -- NO would be least misleading.
[Chalky] to with being funny/a sense of humour -- NO. Hmmm, there is a humour component in the work of fiction I mentioned earlier. But in the main, NO.
[Irouléguy] is the mineral water -- NO would be most helpful here.

To summarise:

This abstract with animal, vegetable and mineral connections is more common in some places than others but is not primarily connected to geography. It involves a human element in some way, more specifically some activity of the brain and even more specifically thought, but is not actually any of these. There is some relationship with a group of people. Only humans construct it (although this may be debated).

Religion, mathematics, art, and non-human animals can have something to do with it but only in a certain sense, and it can be found in at least one fictional work (but not only there) and some people may involve it in a hobby or pastime. It is not in itself an action, process or activity but a certain amount of skill is related to its existance.

It is not: this game, a genie, a degree in woodland conservation, from fiction, an activity, a process, agriculture, evolution, a settlement, the environment, an emotion, a hobby, something you can do or be, science, thought, something spiritual, a family (or group of people), ethics, a skill, a plant, water, to do with death or to do with humour.

I could also say that it should probably be considered to have abstract connections as well, but although strictly accurate, that may not be helpful. I think this summary should be very helpful indeed.