Multiple choice

In monocot stem, the lacuna is formed by the disintegration of

  1. protoxylem

  2. metaxylem

  3. protophloem

  4. matephloem
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Explanation

In monocot stems, the protoxylem (the first-formed xylem) is the innermost xylem and often gets compressed as the stem grows. The disintegration of protoxylem elements creates a cavity called a lacuna. This is a characteristic feature of monocot stem anatomy not seen in dicots.

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