Key Notes on Simple Tissue

Simple tissues were made up of cells with comparable structural and functional characteristics, i.e. they are made up of only one type of cell. Plant tissue is composed of various cells that are all essentially the same. The epidermis is the first layer of skin to appear. Both plants and mammals have epidermis, which serves the same function. It’s a form of plant tissue made of thin, densely packed cells that keep organisms’ interiors secluded from the outside environment. The epidermis is usually covered in waxy protection to keep the plant from burning and drying out in the sun.

Tissue

In multicellular animals, tissue is a level of structure that consists of a collection of physically and functionally identical cells and their intercellular substances. By definition, unicellular organisms do not have tissues. Tissues are absent or poorly differentiated, though, in the simplest multicellular animals, also including sponges. However, more evolved multicellular animals and plants have specialised tissues that may organise and regulate an organism’s reaction to its surroundings.

Name the Types of Simple Tissues

Tissues are described as a collection of cells with similar structures and functions. They form a cellular organisational level in the human cell system hierarchy. The functional groups of tissues are therefore combined to form organs.

Permanent tissues

Permanent tissues were tissues that have stopped developing. These problems can be found in both primary and secondary meristematic tissues, and they have a distinct structure and organisation. They, on the other hand, cannot divide.

Permanent tissues are divided into two categories based on their constituent cells:

• Simple tissue: sclerenchyma, parenchyma, collenchyma
• Complex tissue: xylem and phloem

Parenchyma

Because of the presence of thin-walled cells, they are living and walled cells that are soft.

Collenchyma

These are characterised by living cells with irregular thick walls. This unequal thickening of cell walls provides somewhat rigid mechanical support coming primarily from the elongated cells of ground meristems and occasionally procambium.

Sclerenchyma

They have thickened lignified walls in their cells, giving them strength and waterproofing.

Simple Tissues Different From Complex Tissues in Plants

Simple Tissues 

Simple tissues are made up of physically and functionally comparable cells. They only contain one sort of cell. There are 3 kinds of simple tissues: parenchyma, collenchyma, and sclerenchyma. The epidermis comprises guard cells that regulate the stoma, a small opening. This stoma allows plants to move water and nutrients from the soil by regulating air and water flow through the leaves. Cork, a form of essential plant tissue, is sometimes used to coat the epidermis. In woody plants, cork is a plant tissue that dies and produces an outer bark shell. Insects, light, and elements are all repelled by a waxy coating on this tissue.

Complex Tissues

Complex tissues are made up of multiple types of cells that work together. Complex issues are involved in the transfer of organic material, water, or minerals up and down the plants. As a result, they’re also called Conducting and Vascular Tissues. A plant’s complex tissues are in charge of conveying nutrients and water to the leaves and removing photosynthetic products from them. Photosynthesis produces sugar glucose. To make sucrose or a variety of disaccharides, the substance is changed and attached to additional 6-carbon sugars. In this state, it may be moved with a small amount of water or delivered efficiently all through the plant. The complex tissues of the plant help in this overall effort by giving food to the roots and water and nutrients to the leaves.

Types of Complex Tissues

Xylem

Plants have xylem, a form of vascular tissue that transports water and dissolved minerals from the ground to the rest of the plant while also providing physical support. Tracheary components, which are specialised water-conducting cells, make up xylem tissue. Xylem is found in all vascular plants, such as seedless club mosses, ferns, horsetails, angiosperms and gymnosperms. It works in tandem with phloem.

Phloem

The phloem is composed of living tissue that uses turgor pressure or energy in the form of ATP to actively transport sugars to plant organs, including fruits, flowers, buds, or roots; the xylem is the other thing that makes up the vascular plant transport system. The phloem is made up of a variety of elements. Each component cooperates to transport sugars and amino acids from a source to sink tissues, where they’re being digested and preserved.

Conclusion

Tissues are described as a collection of cells with similar forms and functions. This forms a cellular organisational level within the cell and organ system hierarchy. The functional groups of tissues are therefore combined to form organs. Tissues, like organs and organ systems, are classified based on their specialised functions and their interactions with each other. Histopathology is the study of disease-related tissue, while histology is tissue study. Tissues are embedded and segmented in a paraffin block, the standard approach for analysing tissues. It will clear all your doubts regarding how simple tissues are different from complex tissues in plants.