Question

The meristele of fern is
(A) Radial
(B) Collateral
(C) Amphicribral
(D) Leptocentric

Answer 1

Hint: The leaf gaps that are present in the way of overlapping the siphonostele is called the dictyostele. The vascular tissues that are present in the gaps of the leaves are called meristele. This meristele is mainly found in the rhizome part of the fern.

Complete answer:
The meristele of the fern is amphicribral in nature. These types of vascular bundles are also known as hadrocentric vascular bundles. In this type, the xylem tissues are completely surrounded by the tissues of the phloem. Xylem tissues are the tissue that carry water from the roots of the plant to the leaves which is the site of the photosynthesis.

And the phloem tissue carries the food and the other materials from the leaves to the other parts of the body like stem, root etc. This type of vascular bundles is mainly seen in the pteridophytes. The fern comes under the pteridophytes. This amphicribral type of vascular bundles are also seen in the lycopodium, Selaginella, horsetails, club mosses, azolla, marsilea, psilotum etc. Hence the meristele of fern is amphicribral in nature.

Hence the correct answer is OPTION(C)

Note: In the radial vascular bundle, the phloem and the xylems are present in the same radius. In collateral, same as the radial vascular bundle but the xylem is present in the center and the phloem occurs at the periphery. The leptocentric vascular bundle are also known as amphivasal vascular bundle. The amphivasal vascular bundles are completely opposite to these amphicribral bundles. In the amphivasal vascular bundles, the phloem is surrounded by the xylem.