What is Centrarch xylem?

Centrarch: xylem forms one chamber in the middle of the stem, with metaxylem surrounding the protoxylem. This formation is not found in any living plants today. Exarch: xylem develops in multiple strands, and each strand develops inward towards the center of the root.

Which of the following character is similar in both xylem and phloem?

Similarities between Xylem and Phloem Ø Both are the components of vascular tissue system of plants. Ø Both contain living and dead cells. Ø Both contain parenchymatous cells. Ø Both contain fibres.

Are Lignophytes monophyletic?

The lignophytes, or woody plants (also called Lignophyta), are a monophyletic lineage of euphyllous vascular plants that share the derived features of a vascular cambium, which gives rise to wood, and a cork cambium, which produces derived independently in these taxa, being unifacial.

In which of the following structure of plant xylem develops in centrifugal manner?

Endarch is used when there is more than one strand of primary xylem in a stem or root, and the xylem develops from the inside outwards towards the periphery, i.e., centrifugally.

Which contains Mesarch xylem?

Mesarch – Here, protoxylem in a primary xylem strand develops first in the center of one strand and it continues to develop both centrifugally and centripetally. This type of arrangement is found in the leaves and stems of ferns and pteridophytes. So, the correct answer is “Ferns”.

What is Sclerenchymatous?

Definition of sclerenchyma : a protective or supporting tissue in higher plants composed of cells with walls thickened and often lignified.

Is phloem fibres living or dead?

The phloem is composed of sieve tubes, companion cells, phloem parenchyma and fibres. The fibres are the dead sclerenchymatous cells in the phloem responsible for mechanical support. These cells are considered as non-living component of phloem.

When xylem and phloem are separated by a strip of cambium it is called?

Collateral vascular bundles are the vascular bundles in which the xylem and phloem are arranged side by side on the same radius. If cambium is present in between xylem and phloem, it is called as open collateral bundles.

What are Lignophytes?

The lignophytes are vascular land plants that produce robust wood through a cambium. The origin of the cambium, a structure which produces wood and thus girth in a plant, allowed plants to grow into trees on the Earth.

What is a Lycophyll?

In plant anatomy and evolution a microphyll (or lycophyll) is a type of plant leaf with one single, unbranched leaf vein. Plants with microphyll leaves occur early in the fossil record, and few such plants exist today.

What is centrifugal xylem?

Exarch is used when there is more than one strand of primary xylem in root or stem, and the xylem develops from outside to inside that is centripetal, while endarch is used when there is more than one strand of primary xylem in root or stem, and the xylem develops from inside to outside that is centrifugally.

When formation of metal xylem is in a centripetal manner the xylem is?

Exarch
So, the correct answer is ‘Exarch’.

What is Mesarch vascular bundle?

The term mesarch is used when there is more than one strand of primary xylem in a stem or root and the xylem develops from the middle of a strand in both directions. The metaxylem is thus on both the peripheral and central sides of the strand with the protoxylem between the metaxylem possibly surrounded by it.

What is Diarch xylem?

/ (ˈdaɪɑːk) / adjective. botany (of a vascular bundle) having two strands of xylem.

What is the role of Sclerenchymatous tissue?

Sclerenchyma tissue, when mature, is composed of dead cells that have heavily thickened walls containing lignin and a high cellulose content (60%–80%), and serves the function of providing structural support in plants.

What is Sclerenchymatous Hypodermis?

Explanation:Sclerenchymatous hypodermis is a characteristic feature of the monocot stem. Monocot stems have scattered vascular bundles and pith is absent. Vascular bundles are conjoint and closed in a monocot stem.

How xylem is different from phloem?

Xylem and phloem facilitate the transportation of water, minerals and food throughout the plant. Xylem carries water and minerals from the roots to the leaves. Whereas, phloem carries the food prepared by the leaves to different parts of the plant.

Are xylem fibres living or dead?

Xylem Fibre: Dead cell with lignified walls and a central lumen. Involved in water transportation and providing mechanical support. Xylem Parenchyma: Only living cells of the xylem and store starch and fat.

What is stele made up of?

In a vascular plant, the stele is the central part of the root or stem containing the tissues derived from the procambium. These include vascular tissue, in some cases ground tissue (pith) and a pericycle, which, if present, defines the outermost boundary of the stele.

Where are radial vascular bundle found?

The correct answer is (B) Both monocot and dicot roots. In the vascular bundles, xylem and phloem are present on different radii called radial vascular bundles. Radial vascular bundles are found in dicot roots and monocot roots.