Question

The xylem which is functional in a dicot tree is [AMU 1989]
A) Spring wood
B) Sap wood
C) Autumn wood
D) Heart wood

Answer 1

The correct answer is the option B - Sapwood.

In most of the trees, xylem is the wood. The xylem cells divide and differentiate into the bifacial lateral meristem and the vascular cambium, which later goes on to produce the secondary xylem and the phloem.

Sapwood is also called as Alburnum which is a light-colored outer zone. It is a  physiologically active zone with active and alive sapwood cells. They have abundant pore spaces through which the sap moves in these tissues.

Answer 2

The correct option is (B)   Sap Wood
Explanation:
Sapwood also called 'Alburnum', outer, living layers of the secondary wood of trees which engage in transport of water and minerals to the crown of the tree. The cells therefore contain more water and lack the deposits of darkly staining chemical substances commonly found in heartwood. 
Sapwood is thus paler and softer then heartwood and can usually be distinguished in cross-sections, as in tree stumps, although the proportions and distinctness of the two types are available in different species.