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Standard XII
Biology
Question

A closed collateral bundle is one where
  1. Xylem and phloem occur on different radii
  2. Collateral bundle without cambium
  3. Xylem and phloem are separated by cambium
  4. Collateral bundle with cambium

A
Xylem and phloem are separated by cambium
B
Xylem and phloem occur on different radii
C
Collateral bundle without cambium
D
Collateral bundle with cambium
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Solution
Verified by Toppr

In Closed collateral bundle the cambium is absent in between xylem and phloem. Therefore stems having this type of bundle do not have normal secondary growth. Ex. Monocotyledonous stem. Usually these bundles are enclosed within bundle sheath made up of sclerenchyma and those that lack the sheath are considered as anomalous (e.g. Asparagus stem).
So, the correct answer is 'Collateral bundle without cambium.'

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