A) Spring wood
B) Autumn wood
C) Heart wood
D) Sap wood
Correct Answer: D
Solution :
The outer region of old tree stem consists of recently formed xylem elements in sapwood or alburnum. Central region of the old trees that was formed earlier is filled up with tannins, resins, gums and other substances that make it hard and durable is called heart wood or duramen. Each annual ring in the stem of dicot plant has two parts, ie, spring or earlywood and autumn or late wood. Springwoocf is wider with larger, wider and light coloured xylem elements, whereas autumn wood has smaller, narrow and darker xylem elements.
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