Spring wood and autumn wood are found in
Answers
Spring Wood=sw
Autumn Wood=aw
sw=It is formed during spring season
aw=It is formed during winter season.
sw=It constitutes the major part of the annual ring.
aw=It constitutes as a narrow strip in the annual ring.
sw=Spring wood is present in the beginning of an annual ring.
aw=Autumn wood is present a the end of an annual ring.
sw=Forms plenty of xylem vessels with wider cavities.
aw=The cavities of xylem vessels are narrower.
sw=Xylem fibers are fewer in number.
awAbundant xylem fibres are produced.
sw=Wood is lighter in colour.
aw=Wood is darker in colour.
sw=It has a lower density
aw=It has a higher density
sw=It is also called early wood.
aw=It is also called late wood.
★ SPRING WOOD AND AUTUMN WOOD:-
→ The activity of cambium is under the control of many physiological & environmental factors.
→ In temperate regions, the climatic conditions are not uniform.
→ In spring season, cambium is very active and produces a large number of xylem elements having vessels with wider cavities.
→ The wood formed during this season is called tom spring wood. It is lighter in colour and has a lower density.
→ During winter, cambium is less active and it forms fewer xylary elements which have narrow vessels. This wood is called autumn wood.
→ It is darker and has a higher density.
→ These two kinds of woods that appear as alternate concentric rings constitute an annual ring.
→This is used to estimate the age of tree.