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What is protoxylem lacuna?...

What is protoxylem lacuna?

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i. in monocot stem, Xylem vessels are arranged in the form of 'Y'. The two metaxylem vessels are located at the upper two arms and one or two protoxylem vessels occur at the base.
ii. In a mature bundle , the lowest protoxylem disintegrates and forms a cavity known as protoxylem lacuna.
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