The shape and the number of cell different different organisms . Explain with example
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Answer:
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Explanation:
There’s no exaggeration in the fact that we are alive because of the 10 trillion cells in our body. Each of these cells is repeatedly performing the actions in our body to help us get through the day to day activities. The role and importance of cell are undeniable. But have you ever pondered about the cell size? In this topic, we’ll help you understand the cell number, cell shape and cell size.Cell Number
Our human body has trillions of cells. Surprisingly enough, each of these cells varies in shapes and sizes. There are several different groups of cells which perform a plethora of functions. Every organism that has more than one cell is known as the multi-cellular organism.
Even an organism that has billions of cells happens to begin its life with a single cell, that is a fertilized egg. This fertilized egg goes on to multiply, thereby increasing the number of cells as the development takes place. If an organism is a single-celled organism, then it would be a unicellular organism.
Answer:
Variety in cell number, shape and size:
Variety in Number: Living beings show a large variation in number of cells. Large organisms; like humans, elephants, tiger, etc. are made up of trillions of cells but amoeba and bacteria are made up of single cell. On the basis of number of cells, organisms can be divided into two groups, viz. unicellular and multicellular organisms.
Unicellular Organism: An organism which is made up of a single cell is called unicellular organism, e.g. bacteria, protozoa, yeast, etc.
Multicellular Organism: An organism which is made up of more than one cell is called multicellular organism, e.g. humans, elephants, tiger, banyan, snail, etc.
Tissue: A group of specialized cells made for a specific task is called a tissue. While a single cell is responsible for all the functions in a unicellular organism, different tissues perform different functions in a multicellular organism.
Variation in Shape
Cells show wide variations in terms of shape. A particular shape of a cell facilitates the particular function performed by that cell. Some examples are as follows:
Amoeba is a unicellular organism. It is of irregular shape. The shape of amoeba keeps on changing because of formation of pseudopodia. Similarly, white blood cells (WBCs) in our body are of irregular shape.
Cells are generally round, spherical or elongated.
Smooth muscle cells are spindle-shaped. They are swollen in the middle and pointed at both ends.
Red Blood Cells are concave and round. RBCs can easily pass through narrow capillaries because of concave shape.
Cells of striated muscle are cylindrical in shape and are very long.
Nerve cells (neurons) appear like a star with long tail.