Tyloses are ballon-like outgrowths in the lumen of secondary xylem tracheids and vessel of duramen region. These are actually

Outgrowth of vessels of xylem

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Ingrowth of vessels

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Ingrowth of xylem parenchyma

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Swelling of xylem fibres for no function

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Solution

The correct option is C Ingrowth of xylem parenchyma
Tyloses are the balloon - like outgrowths which forms due to the ingrowth of adjacent xylem parenchyma cells into the lumen of xylem vessels. This structure checks the plants from being damaged in the stressed condition like drought or infection by falling from the sides of the cells.
So, the correct answer is option C.

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Balloon like expansions of xylem parenchyma into the lumen of the vessels in secondary xylem are called

\begin{matrix} C o l u m n I & C o l u m n I I A . X y l e m v e s s e l s & 1. S t o r e f o o d m a t e r i a l s B . X y l e m t r a c h e i d s & 2. O b l i t e r a t e d l u m e n C . X y l e m f i b r e & 3. P e r f o r a t e d p l a t e s D . X y l e m p a r e n c h y m a & 4. C h i s e l - l i k e e n d s \end{matrix}

	I		II
(a)	Tracheids	(i)	Cells possess highly thickened walls with oblilateral central lumen
(b)	Vessels	(ii)	Elongated tube like cells with thick lignified walls and tapering ends
(c)	Xylem parenchyma	(iii)	Individual members are interconnected through perforations in their common walls
(d)	Xylem fibres	(iv)	Cells are living with thin cellulose cell wall.

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