The balloon like growth of parenchyma, in the lumen of a vessel, is called as
A
Phellogen
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B
Histogen
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C
Tylose
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D
Tunica
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Solution
The correct option is C Tylose
The outgrowths on parenchyma cells of xylem vessels of secondary heartwood are known as tyloses. These falls from the sides of the cells and "dam" up the vascular tissue to prevent damage to the plant during flood or infection.
Tyloses can aid in the process of making sapwood into heartwood in some hardwood trees, especially in trees with larger vessels. These blockages can be used in addition to gum plugs as soon as vessels become filled with air bubbles, and they help to form a stronger heartwood by slowing the progress of rot.