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Question

Which of the following vascular bundles are always open?

A
Radial
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B
Collateral
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C
Bicollateral
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D
Concentric
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Solution

The correct option is C Bicollateral
Answer is option C i.e. "Bicollateral"
A vascular bundle is a part of the transport system in vascular plants which includes xylem and phloem tissues.
Bicollateral vascular bundles are always open. Here, xylem is situated in middle of two phloem strands. Example: stem of Cucurbita. These bundles are called open type as strips of cambia are present but the secondary thickening occurs only by the outer cambium.

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