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In barley stem vascular bundles are
A
Closed and radial
B
Open and scattered
C
Closed and scattered
D
Open and in a ring
Detailed Solution
Barley is a monocotyledonous plant (a grass).
In the monocot stem the vascular bundles are numerous and scattered throughout the ground tissue, each surrounded by a sclerenchymatous bundle sheath.
They are conjoint (xylem and phloem on the same radius) and closed, i.e., there is no cambium between xylem and phloem, so there is no secondary growth.
Open bundles arranged in a ring are found in dicot stems, and radial bundles are found in roots.
Hence in barley stem the vascular bundles are closed and scattered.
In the monocot stem the vascular bundles are numerous and scattered throughout the ground tissue, each surrounded by a sclerenchymatous bundle sheath.
They are conjoint (xylem and phloem on the same radius) and closed, i.e., there is no cambium between xylem and phloem, so there is no secondary growth.
Open bundles arranged in a ring are found in dicot stems, and radial bundles are found in roots.
Hence in barley stem the vascular bundles are closed and scattered.