Question

what are vascular tissues what are their types​

Answer 1

The tissue in vascular plants that circulates fluid and nutrients. There are two kinds of vascular tissue: xylem, which conducts water and nutrients up from the roots, and phloem, which distributes food from the leaves to other parts of the plant

Answer 2

The vascular bundles are classified accordingly as per the relative location of xylem and phloem.

(1) Radial vascular bundle: In these types of vascular bundles xylem and phloem tissues occur at alternate radial locations in different groups. This can be seen at the roots.

(2) Conjoint vascular bundles: In conjoint vascular bundles, the xylem and phloem tissues are present on the same radius and only opposed to each other. In dicot stems this is a common phenomenon. Conjoint vascular bundles are of two forms, depending on the number and the location of the phloem gro

(3) Concentric vascular bundles: The either xylem surrounds the tissue of the phloem occasionally or vice versa. Such bundles of vascular substances are called concentered vascular bundles. When xylem surrounds the phloem tissue from all sides, the vascular bundle is called amphivasal vascular bundle (leptocentric type). Such bundles are seen after secondary growth in monocot plants like Dracaena. The vascular bundle is called amphicribal vascular bundle (hadrocentric type) when phloem covers the xylem tissue altogether. These vascular bundles occur in pteridophytes such as Selaginella etc.

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