What do you mean by Vascular bundle ? Into how many types Vascular bundles are divided​

Question

What do you mean by Vascular bundle ? Into how many types Vascular bundles

are divided​

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3 months 2021-07-24T11:25:59+00:00 2 Answers 0 views 0

1. EXPLANATION :

There are mainly three types of vascular bundles:

(i) Radial: Those in which the xylem and the phloem lie radically side-by-side (for example, in roots of seed plants). This is the most primitive type.

(ii) Conjoint: Those in which the two types of tissues are separated from one another. Here xylem and phloem together form a bundle. The two sub-types are collateral and bicollateral.

iii) Concentric: Those in which one type of tissue surrounds or ensheaths the other. The concentric bundles may be of two subtypes, amphivasal bundle as found in Dracaena., Yucca and other monocots and some dicots. If the phloem surrounds the xylem, it is amphicribal as found in many ferns. Such bundles are always closed

Hope it helps