Diagram of Parenchyma Tissue (original) (raw)
Last Updated : 23 Jul, 2025
**The diagram of parenchyma tissues shows the composition of the most abundant simple tissue found in plants. In cross-section, cells of the parenchyma appear loosely packed, isodiametric, and thin-walled. These cells perform various functions like photosynthesis, storage of nutrients, secretion, and provide support.
Parenchyma cells are progenitors of other permanent tissues in plants and differentiate to form sclerenchyma and collenchyma. It acts as the ground substance for the plants where other tissues remain embedded. In this article, we will look into the diagram of Parenchyma tissues along with their characteristics and structure.
Table of Content
- What is Parenchyma?
- Diagram of Parenchyma
- Characteristics of Parenchyma Tissue
- Structure of Parenchyma Cells
- Types of Parenchyma Tissues in Plants
- Functions of Parenchyma
What is Parenchyma?
Parenchyma is a term used in biology to describe a type of simple plant tissue composed of thin-walled, undifferentiated cells. These cells are typically involved in various physiological functions within plants, such as photosynthesis, storage, and secretion. Parenchyma cells are usually found in the cortex and pith of stems, the mesophyll of leaves, and the flesh of fruits. They are often the most abundant type of cells in plant tissues and play an important role in the overall functioning and growth of the plant.
**Definition of Parenchyma: Parenchyma is a simple plant tissue composed of loosely packed, thin walled, and isodiametric cells. They make up the bulk of the plant.
Diagram of Parenchyma
Below is a well-labeled diagram of parenchyma:
Characteristics of Parenchyma Tissue
Parenchyma has some typical characteristics which are listed below:
- Parenchyma is a permanent tissue made of living cells.
- Parenchyma cells can be totipotent in some cases as in plant zygote.
- Parenchyma forms in continuous masses and form the pith, mesophyll, etc.
- The parenchyma can associate with other tissue type and form complex tissues like xylem and phloem.
- Parenchyma tissue has intercellular spaces.
Structure of Parenchyma Cells
The following describes the structure of parenchyma cells:
- Parenchyma cells are living cells.
- They are isodiametric.
- Their shape can be oval, spherical , or polygonal.
- The cell wall of these cells are mostly thin and made up of cellulose.
- These cells can carry out different functions like photosynthesis, storage, secretion, etc.
- They have multiple vacuoles that merge to form a large vacuole at maturity.
- Storage parenchyma cells can have xyloglucan.
- Parenchyma cells of colorful plant parts like flowers have chromoplast.
- Photosynthetic parechyma cells have chlorophyll.
- Secretory cells will have dense cytoplasm eith more ribosomes and Golgi bodies.
Types of Parenchyma Tissues in Plants
Based on their function and structure Parenchyma can be classified into following types:
Chlorenchyma
Chlorenchyma is a specialized type of parenchyma tissue primarily found in the mesophyll layer of plant leaves. It contains chloroplasts responsible for photosynthesis. Chlorenchyma cells are closely packed to maximize surface area for efficient light capture and gas exchange.
Aerenchyma
Aerenchyma is a special type of parenchyma that has small compartments are lacunae within them. They are typically filled with air and give a spongy appearance to the tissue. Aerenchymas are present in roots of some plant where they are submerged in water logged environment anf facilitate gaseous exchange between shoot and root. They also provide buoyancy in floating plants.
Secretory Parenchyma
Secretory parenchyma is a specialized parechyma that produces and releases substances for various functions such as defense, attraction, and protection. They are found in specific plant organs or structures and secrete substances like resins, oils, nectar, and mucilage. They have a compact cytoplasm and specialized organelles that help in secretion.
Secretory parenchyma provides plants with adaptive advantages, aiding in defense against herbivores and pathogens, attracting pollinators, and protecting against environmental stresses.
Functions of Parenchyma
The functions of Parenchyma are as follows:
- They store food in the form of starch, proteins, oils, etc.
- They can store water as in Opunctia and other succlents.
- In hydrophytes, they modify into aerenchyma and helps in gaseous exchange and buoyancy.
- Parenchyma provides rigidity to the plant.
- Chlorenchyma helps in photosynthesis.
- Secretory parenchyma secret substance that act as secondary metabolites or defence substances for plants.
- Help in conduction of food.
- Protects internal tissues by developing epidermis.
Conclusion - Diagram of Parenchyma Tissues
Parenchyma is the most abundanst simple permanent tissue found in plant. The parenchyma contains oval, spherical or polygonal cells that are loosely packed. Parenchyma forms ground tissue in many organs and many tissues tie embedded in it. It is versatile in function and carry out multiple function like photosynthesis, secretion, etc. in plants. The diagram of parenchyma shows the detailed structure of tissue and its components. They also act as precursor of many cell types like schlerenchyma, collenchyma, etc. They remain accosiated with many other tissues to form complex tissues called complex tissue.
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