How many of the given structures/tissues are completely secondary in origin?
| Earlywood, Leaves, Lenticels, Cork, Autumn wood, Late bark, Flowers |
The secondary xylem is referred to as wood. The wood formed during this season is called spring wood or early wood.
In winter, the cambium is less active and forms fewer xylary elements that have narrow vessels, and this wood is called autumn wood or late wood.
Phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem.
At certain regions, the phellogen cuts off closely arranged parenchymatous cells on the outer side instead of cork cells. These parenchymatous cells soon rupture the epidermis, forming a lens-shaped openings called lenticels.
Bark is a non-technical term that refers to all tissues exterior to the vascular cambium. Bark that is formed towards the end of the season is late or hard bark.
Therefore, all these structures are secondary in origin.
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