First slide

Anatomy of Dicotyledonous and Monocotyledonous Plants

Question

In a root endodermis, passage cells are present

Moderate

A

opposite to conjunctive tissue
B

opposite to xylem
C

opposite to phloem
D

opposite to both phloem and xylem

Solution

Passage cells are those endodermal cells with casparian thickenings only on the radial walls but not tangential walls. They allow the passage of mineral water collected in the cortex into xylem. Since mineral water has to enter into the xylem, they are present opposite to xylem. Such endodermis acts as water dam for the entry of water from cortex into the root xylem.

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