What are rhizoids? Function, structure, morphology

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2018-03-24 07:59:11

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Each plant consists of three main parts: roots, stem and leaves. They are linked by a conductive tissues and promote normal growth and development of the body. But this applies only to the evolutionary more advanced plants. Such lower organisms as mosses, lichens and algae can not boast a high level of development, which means that their body is arranged much easier. For example, functions of roots they have rhizoids serve. What is the rhizoids of algae, mosses and other primitive organisms developed? What is their evolutionary value?

What is a rhizoid? Definition

The Rhizoids – thread-like part of the lower plants, which represent one or more cells and function as root. Often they are colorless, short (their length is limited to a few millimeters) and not too strong.

What are the differences between the root and a rhizoid?

  1. The rhizoids no conducting tissues. Osmosis and the flow of water in the body – one of the main functions of plant roots. If in underground structures, there is no xylem and phloem, they cannot be considered true roots.
  2. A Big difference in size of roots and rhizoids. If the first can reach tens of meters in length and meters in width, the rhizoids are small, sometimes even microscopic education.
  3. The Root – this is the aggregate of a great number of cells and tissues. Rhizoids, in turn, can be formed by a few or even one cell, depending on the functions.

However, one similarity can be seen immediately: the root and the rhizoids function as zakalivanie – hold the body of the plant in the soil. But even here you can make a reservation that root is significantly more effective in accomplishing this function, rather than rhizoids.

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Still, the rhizoids are a kind of precursor to the true roots. These entities are in the process of evolution gave rise to a new type, so they are of great importance in terms of development of fauna, as well as attract the interest of botanists. That's what the rhizoids in biology.

what is a rhizoid

Rhizoids

The Importance of these structures in biology is not confined to the great role in the process of evolution. The rhizoids also serve some of the functions associated with supporting the growth and development of mosses, lichens, algae. Among them:

  1. Hold the main parts of the plant in the soil or on the seabed if we are talking about algae.
  2. Gas exchange and soil loosening.
  3. Avoid contact with excess water, too large drops of moisture.
  4. Water Absorption.

This is the most General function that can perform the rhizoids of algae and moss.what are rhizoids in biology

Types of rhizoids

Not all underground structures of mosses and algae are similar to each other. Even among such simple formation is observed specialization depending on the functions and structure. What are rhizoids and what they are in nature?

The Rhizoids may be smooth (simple) and reeds. The first is a conventional underground structures that serve to attach, the sustainability of plants and maintain their immobility.

Reed rhizoids are characterized in that their diameter is slightly smaller, the walls thinner and wavy. Inside such formations are observed growths resembling nipples or tongues, hence their name. The function of such rhizoids – this ingress of water by capillary method, which contributes to this unusual form.

In the study “felt” of rhizoids is possible to find intermediate variants of these structures, which incorporates features such as smooth and reed counterparts. That's what the rhizoids in terms of variety of structures.

what is the rhizoids of the algae

What organisms can you find a rhizoids?

Previously, mosses and algae belonged to the lower plants, because their structure was evolutionarily less developed than that of spore and seed plants. All members of the Kingdom lichens are also observed in the rhizoids, as this organism is a symbiotic relationship between algae and fungi. By the way, some representatives of fungi also form a rhizoid.

Not all mosses possess these underground structures. For example, sphagnum moss, who lives on wetlands, absorb water through the body surface, respectively, in this case, the formation of rhizoids is not necessary. The same situation and all spinornyh of mosses.

what is the definition of rhizoids

What is the difference between rhizoids and ISOmodem?

We learned, what are rhizoids and what role in the process of evolution they played for the whole of the biological world. However, there are intermediate underground structures, which on the evolutionary scale are between rhizoids and rhizome. We are talking about asomoah – one type of the root structures of the more developed organisms than mosses or algae.

Retmode represent a predecessor of the rhizome of ferns and silt. They are formed by the interweaving of several rhizoids are so closely like it's one solid structure. However, they are not true roots for the same reason that the rhizoids of mosses, algae and lichens. Now I understand what are rhizoids and what is their difference from ISOmodem.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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