Parenchyma and Collenchyma Cells

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Explain the Difference Between Parenchyma and Collenchyma Cells

Parenchyma cells play an essential function in the process of photosynthesis, storage, and tissues repairing. Also, they help in the processing of many substances and storage of water in it. However, collenchyma cells are living tissues comprising of thick cellular walls. These elongated shaped structures have only one type of cell present under the epidermal layer of a plant stem or leaf veins. 

Although both are present in plant cells, there is a visible difference between parenchyma and collenchyma cells. Let’s take a look.


Parenchyma and Collenchyma Cells and its Differences

Parenchyma 

Collenchyma 

These cellular structures can be seen in most of the soft parts of a plant.

These cells are present in leaf veins, petioles and young plants.

They have unspecialised cells.

They have specialised cells.

It comprises of a thin cellular wall.

Collenchyma consists of a thick cellular wall.

The wall of a cell consists of only cellulose.

The cell walls comprise of pectin and hemicellulose.

The parenchyma has intercellular space within cells.

There is no or very little intercellular space available within cells.

Its primary functions are photosynthesis, storage of food particles, and repairing of tissues, etc.

The primary function of collenchyma is providing additional support to withstand forces of nature.

It mainly acts as a storage tissue.

Collenchyma acts primarily as a mechanical tissue.

It is available mostly in the outer and inner portions of a plant.

Its presence gets restricted to epidermal layers of plants.

These cells have vacuoles present in it.

Vacuoles are absent in a collenchyma.

They have a spherical, oval, and rectangular form or have a rod-like shape.

Their shapes are variable and lack a specific form.

The cells have a loose arrangement.

The cells of collenchyma have a compact arrangement.

Define Parenchyma 

Parenchyma comprises of a set of non-specialised tissue, having a primary thin cell wall of cellulose. These parenchymatic cells are present in the cortex and medulla of the plant stems along with roots, leaves, seeds and fruit pulp, etc. They form approximately 80 per cent of a plant’s living cells, and some of these are available in the xylem and phloem.

If you want to know more regarding what is collenchyma tissue, learn the below facts carefully!


What is Collenchyma?

Collenchyma comprises of a single cell along with an elongated form. These cells have a compact arrangement and mostly available in leaves and stems of young plants. However, they are not available in the roots apart from the aerial ones, and is absent mainly in monocot trees.

The primary collenchyma function is providing support for the growth of stems and other parts of dicot plants. Also, it gives the tissue an excellent resistance against external stresses and mechanical forces.


Types of Parenchyma and Collenchyma Cells

Parenchymatic cells comprise of four types based on function, such as: 

  • Photosynthesis Parenchyma: Also known as chlorenchyma, they are responsible for food preparation in plants. These cells are commonly present below the epidermis along with leaves and cortex of trees.

  • Aeriferous: Also known as aerenchyma, they have many intercellular spaces present in them. Plants with these cells are accountable for the release of greenhouse gases.

  • Storage Parenchyma: These cells are responsible for the storage of numerous substances and synthesis in trees. The starch, lipids and proteins solution are present in the vacuoles. In specific parenchymatic cells, there is a storage of single substance, whereas many of them are also present in a single cell.

  • Aquiferous: These types of cells play the primary role of water storage in a large vacuole present within a cellular wall. They are present in xerophyte trees.


Collenchymatic cells consist of the following types based on the thickness of cellular walls. These include:

  • Angular: The cellular wall’s thickness has an angular location to the cells with no intercellular space.

  • Lamellar Collenchyma: The thickness is present within the inner and outer tangent walls.

  • Lacunar: Intercellular gaps are present in it, and the cell wall thickness has a close association with these spaces.

  • Annular Collenchyma: The thickness shows a uniform distribution in appearance surrounding the cells.


Rack Your Brains

Here are some questions on the difference between parenchyma and collenchyma cells. Go through them and try solving these to excel in your studies!


1. The Absence of Lignin in a Simple Mechanical Tissue is Known as _________

  1. Sclerenchyma.

  2. Collenchyma.

  3. Chlorenchyma.

  4. Aerenchyma.

  5. None of these.


2. What is a Waxy Substance Having a Relation with the Cork Cell Wall Known?

  1. Suberin.

  2. Chloroplasts.

  3. Cellulose.

  4. Protein.


Preparation Tips to Score Well

From the above discussion, you can understand the difference between parenchyma and collenchyma cells. 

If you are preparing for NEET examinations, you should take proper attention to your body and mind. So, it is mandatory to take utmost care of your health to crack the exam. You should engage in self-development practises for staying fit, such as yoga and mediation.

By staying mentally and physically healthy, you can give your best in the NEET exams. Also, if you have the zeal to learn more about the collenchyma cells or likewise topics, practise last year’s papers to score well.

FAQ (Frequently Asked Questions)

1. What are the Types of Parenchyma Cells?

Ans. They consist of four types, such as photosynthetic, storage, aquiferous and auriferous parenchyma. Photosynthetic parenchyma contains multiple chloroplasts, whereas storage cells helps in retaining many substances after synthesis. 

2. Where is a Collenchyma Present in Plants?

Ans. Collenchyma acts as a supportive tissue in plants, and they consist of thick walls that are capable of withstanding massive mechanical forces. The cellular walls have compounds such as pectin and hemicellulose.

3. Are Chloroplasts Present in Cells of Collenchyma?

Ans. Collenchyma does not have chloroplasts present in it. However, it has a transparent tissue which allows rays of light to reach deep inside the photosynthetic tissues.