First slide

Secondary Growth

Question

During secondary growth, tyloses can be seen in

Easy

A

Primary xylem
B

Sap wood
C

Secondary phloem
D

Heart wood

Solution

During secondary growth, pit membrane of xylem parenchyma is extended into the tracheary elements of heart wood in the form of balloon like structures and block the lumen of tracheary elements to make the xylem useless for conduction. Such balloon like structures are called as tyloses.

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