Cells- Size, Shape and Count

Definition of Cells

Cells can be defined as the basic unit of life responsible for all life’s processes. A cell has the quality to replicate itself and thus is known as the building block of life. Inside each cell, a fluid which is known as cytoplasm is present which is enclosed by a membrane


In the cytoplasm, there are several biomolecules present like lipids, nucleic acids, and proteins. The cellular structures present are called the cell organelles that are suspended in the cytoplasm. Cells are of different shapes and sizes, essentially like building blocks of structures. 


Characteristics of Cells

Important characteristics of cells are as follows: 

  • Cells assist in giving design and structural support to the body of a life form.

  • The cell interior consists of a number of different individual organelles surrounded by a separate membrane. 

  • The nucleus holds hereditary data essential for multiplication and cell development. 

  • Mitochondria is a double membrane-bound organelle that's mainly liable for the energy transactions that's vital for the survival of the cell.

  • Lysosomes digest undesirable materials present in the cell.

  • The endoplasmic reticulum assumes a significant part inside the inner association of the cell by incorporating specific particles and handling, guiding, and putting them to their fitting areas.

Robert Hooke is the first researcher to watch a cell employing a magnifying device. Yes, cells are too tiny to ascertain with our naked eyes. But not every cell is microscopic. Within our body, we will observe the spread of cells of various shapes and sizes. 


Number of Cells

Cells are the most minimal degree of association in each living thing. The count of the cells may vary from organism to organism. Humans have more cells than bacteria. If an organism is formed from one cell, it's called a unicellular organism (uni: one; cellular: cell) whereas the organisms which are made from more than one cell are called multicellular organisms (multi: many; cellular: cell). Among multicellular organisms, the count of the cell varies. Some may have billions of cells while other organisms may have trillions (like humans). But every organism starts its life from one cell which further divides into thousands and millions.


Unicellular v/s Multicellular 

As the size of the living being gradually increases, so does the quantity of cells that they have. Notwithstanding, this check won't decide the proficiency of a creature that is capacity and effectiveness of a cell in a unicellular life form and multicellular organic entity will be something similar.


Living organisms are made from differing types of cells, of different shapes and sizes. A unicellular organic entity varies fit as a fiddle from another unicellular creature. Within a multicellular organism, there is a spread of cells. Some are short while others are long and slender; some are roundabout while some are oval. 


Size and Shape of Cell 

The shape and size vary from cell to cell consistent with their functions and composition. For example, a neuron is long and branched, meant for the transmission of signals throughout our body while a muscle fiber is little and spindle-shaped which helps in movement. 


Considering an animal cell, we can generalize the form of a cell as round (spherical) or irregular. Plant cells are far more rigid and rectangular in shape. The size of a cell is often as small as 0.0001 mm (mycoplasma) and as large as 6 to 12 inches (Caulerpa taxifolia). For the most part, the unicellular creatures are minuscule, similar to bacteria. But one cell like an egg is large enough to touch. Regardless of their shape, they all comprise similar organelles and assist us with playing out the everyday exercises proficiently.


Importance of Learning about Cells 

A cell is the fundamental and structural unit of life, without which an organism will not be able to perform essential activities such as respiration, digestion etc. Below are the reasons why you should study cells – size, shape, count, and FAQs: 

  • By learning the importance of cells – size, shape, count, and FAQs, you can understand how different organisms function to survive. 

  • Studying cell biology has allowed scientists to develop new vaccines and effective medicines. 

  • Since cells are common units among all living organisms, studying about them can help you understand how living things work and meet their needs.

  • Learning about cells will give you a better understanding of how tissues are formed, transportation of nutrients, production of energy and much more. 

  • When you start studying cell biology, you will get to learn about DNA, cell structures, tissues, etc. 

  • For academic purposes, the cell is one of the most important topics of Biology. That is why you should gain all the knowledge you can about the functional unit of life.   


Learning the Concept of Cells

Learning about the concept of cells – size, shape, count, and FAQs becomes quite easy when you are studying from Vedantu. Here are some tips and tricks to start studying about cells:

  • You can visit Vedantu’s website to learn the size, shape, and structure of cells. We provide explanations to every topic related to cells in a simple language to make the learning process easier for students. 

  • Start making notes while studying cells – size, shape, count, and FAQs. These notes will help you in revising the chapter later during your exam preparations.  

  • Once you have completed the cells – size, shape, count, and FAQs, you can start the textbook exercise to test your knowledge and see whether you have understood the concept or not. 

  • By learning the cells – size, shape, count, and FAQs, you will be able to score well in your final exams. These notes and explanations are based on your Biology syllabus to help you stay on track. 

  • Practice more and more questions related to the concept of cells to enhance your knowledge and improve your understanding of the topic.  

Want to read offline? download full PDF here
Download full PDF
Is this page helpful?
like-imagedislike-image

FAQs on Cells- Size, Shape and Count

1. What is a Cell?

Cells are basic units of life. As we probably are aware, the cell is the fundamental, primary and utilitarian unit of each living life form. As brick is to the building, the cell is to the body. The cell can make anything alive and helps a living organism to perform all its functions in a better way. It is self-sufficient to hold out all the elemental functions of an organism. Cells are of two types – Eukaryotic and Prokaryotic – depending on whether the living organism is unicellular or multicellular. Eukaryotic cells can be either multicellular or unicellular organisms, whereas prokaryotic cells are unicellular organisms only.

2. What are the Different Functions of Cells?

Cell performs different functions in both unicellular and multicellular organisms. They ensure that a living organism responds to any kind of change in the environment. Moreover, the cells allow human beings and animals to reproduce and pass the traits to their offspring. Here are the five basic functions of cells: 

  1. To provide support and structure to the cell 

  2. To facilitate the growth mitosis 

  3. To allow the transport of nutrients

  4. To aid in reproduction

  5. To help in energy production

3. Who Made the Discovery of Cells?

Robert Hooke was the mind behind the discovery of the cell in 1665. Robert Hooke designed a new microscope that made it possible to discover the unit of life that is a cell. He suggested that cells look strangely similar to small or cellular rooms inhabited by monks. That is how the cell was named. 


These cells perform life processes in unicellular and multicellular organisms. They play a pivotal role in respiration, excretion, digestion, etc. That is why a cell is known as the structural and fundamental unit of life. 

4. How Many Types of Cells are There?

There are two types of cells, namely – Prokaryotic cells and Eukaryotic cells. Both these types of cells have different structures but they have a similar molecular composition and activities. The eukaryotic cell contains a nucleus whereas the prokaryotic cell does not have any nucleus but has a nucleus region. Moreover, prokaryotic cells are unicellular organisms while eukaryotic cells can either be unicellular or multicellular. These cells also have some similar features as well. Both eukaryotic and prokaryotic cells share the following features:

  • Ribosomes

  • Cytoplasm 

  • Plasma membrane

  • DNA

5. Name the Biomolecules Present in the Cytoplasm?

There are several biomolecules present in the cytoplasm like lipids, nucleic acids, and proteins. Enclosed by the membrane, the cytoplasm is mainly composed of proteins, salts, and water, which fill each cell. It also contains cytoplasmic components such as organelles, mitochondria, cytosol, etc. In a eukaryotic cell that is an animal or plant cell, the cytoplasm is located between the nuclear envelope and membrane. However, in the prokaryotic cell, the cytoplasm is everything that is surrounded by the membrane.

6. From where can I learn more about the cells – size, shape, count, and FAQs?

You can start studying the cells – size, shape, count, and FAQs from Vedantu’s official website or mobile application. We provide you with the most reliable study material to learn the biology of cells. You can start learning the cells – size, shape, count, and FAQs entirely free of cost only on our official website. Apart from this topic, we have an unlimited stock of resources to help you study and improve your knowledge of Biology. All you have to do is visit Vedantu.com and use as many study materials as you want without paying a single penny. You can learn topics like Algae, Active transport, Biodiversity, and much more to enhance your understanding of the subject.


Learn through videos