Question

Which statement is correct for an open, collateral vascular bundle?
(1) Xylem and phloem lie side by side
(2) Cambium is absent
(3) Xylem and phloem are separated by the cambium
(4) Cambium is found outside the bundle​

Answer 1

Answer:

4. is a correct options

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Answer 2

Answer:

Answer

A vascular bundle in which a strand of phloem is present external to the strand of xylem on the same radius side by side is known as a collateral bundle. Cambium may be present or absent in between xylem and phloem, and so there are the following two types of a collateral bundle:

(a) Closed collateral bundle: In this type cambium is absent in between xylem and phloem. Therefore stems having this type of bundle does 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).

(b) Open collateral bundle: An open collateral vascular bundle has cambium called fascicular cambium between xylem and phloem. The bundles can increase in diameter by normal secondary growth with the help of fascicular cambium. Ex. Dicotyledonous stem.

So, the correct answer is 'Outer side of the xylem'.

solution