"Group" is not a taxonomic rank, such as Life, Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
The other possible use of "group" is in reference to Cultivar Group, but an Oak Tree is not a Cultivar.
Please restate the question.
http://wiki.answers.com/Q/Why_are_Fir_trees_in_a_different_group_to_oak_trees_but_daisies_are_in_the_same_group_as_oak_trees"
a group of trees is called a forest of trees
Yes. There are a lot of oak trees and many other kinds of trees in Ireland. Derry, an Irish county, is called the "Oak Leaf" county and has an oak leaf as an emblem, because of the amount of oak trees that it once had.
lemons
Oak trees grow from seed (acorns) so they could be called seed plants.
Yes.
No oak trees have acorns.
Acorns can be found on oak trees in forests, parks, or wooded areas. Look under oak trees, particularly in the fall when they are most likely to have fallen from the branches. Be sure to check the ground around oak trees.
A group of trees is called a wood from which a forest area could be called a woodland.
A small group of trees is called a "Grove".
OAK TREES ARE USED FOR FURNITURE.
An acorn comes from an oak tree. Oak trees produce acorns, which are a type of nut that serves as a seed for the oak tree to reproduce.