Classify and explain the types of angiospermic woods based on diameter of xylem vessels .

Explanation

On the basis of diameter of xylem vessels , two main types of angiosperm woods are recognised .
1. Diffuse porous woods : Diffuse porous woods are woods in which the vessels or pores are rather uniform in size and distribution throughout an annual ring . Example :Acer
2 . Ring porous woods : The pores of the early wood are distinctly larger than those of the late wood . Thus rings of wide and narrow vessels occur . Example : Quercus .