Question
As secondary growth proceeds, in a dicot stem, the thickness of
sapwood increases
heartwood increases
both sapwood and heartwood increases
both sapwood and heartwood remains the same
Solution
B.
heartwood increases
In a woody stem, due to secondary growth, secondary xylem constitutes the bulk of the stem and is commonly called wood. Width of secondary xylem increases continuously with the age of the plant.
Older stem have two regions- younger sapwood and older heartwood. Both sapwood and heartwood increase in size initially, but when a tree reaches a certain age, amount of heartwood increases and the amount of sapwood remains constant.
