Tissue Systems · NCERT Biology

Monocotyledonous stems are described as having 'closed' vascular bundles because:

  1. They are surrounded by a thick bundle sheath.
  2. They lack cambium between xylem and phloem.
  3. The xylem completely surrounds the phloem.
  4. The stomata are permanently closed in daytime.
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Correct answer: They lack cambium between xylem and phloem.

In monocot stems, vascular bundles do not have cambium present between the xylem and phloem. Consequently, they cannot produce secondary tissues and are termed 'closed' vascular bundles.

Difficulty: Medium Question 9 of 20

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