What is a plant gall?

Answer 1

I think it's some kind of parasitic growth like an 'oak apple'..

http://www.tiscali.co.uk/reference/encyclopaedia/wildlife/insects_insects_-_oak_apple.html

Answer 2

Galls are proliferations of cell tissue in plants and can be caused by various parasites, from fungi and bacteria, to insects and mites. Galls are often very organised structures and because of this, the cause of the gall can often be determined without the actual agent being identified. This applies particularly to some insect and mite galls.

Answer 3

well an oak gall is formed by the gall wasp, they attck the cells of the tree, then it grows on the tree like a small ball, was used to make ink because of the tanning properties. So would imagine it is the same sort of thing or close to

Answer 4

It is a sort of plant tumour.
It is formed in response usually to some sort of injury, normally by another biological agent.
The plant cells proliferate around the injury and isolate it from the plant itself.
A bit like an oyster making a pearl.

Answer 5

It's a piece of machinery boyy!

Answer 6

it is the equivalent of a human tumour