3. Write in brief about the variation in shape and size of cells?
Answers
Answer:
The cells in our body come in various shapes and sizes. The single cell organisms have a different type of cell compared with that of multi-cellular organisms. ... The other shapes of the cells include shapes like branched out cells similar to the neurons, spindle shaped, round shape, and oval or elongated shape.
Answer:
Cells are the lowest level of organization in every life form. From organism to organism, the count of the cell may vary. Humans have more cells than bacteria. If an organism is made up of a single cell, it is called a unicellular organism(uni: one; cellular: cell). Whereas, the organisms which are made up of more than one cell are called multicellular organisms (multi:many; cellular: cell). Among multicellular organisms, the count of the cell varies. Some might have billions of cells while others have trillions (like the human). But every organism starts its life from a single cell which further divides into thousands and millions.

As the size of the organism increases so does the number of cells that they have. However, this count will not determine the efficiency of an organism i.e., the function and efficiency of a cell in a unicellular organism and multicellular organism will be the same.
Read: Unicellular vs Multicellular Organisms
Sizes and Shapes
Living organisms are made up of different types of cells, of different shapes and sizes. A unicellular organism differs in shape from another unicellular organism. Within a multicellular organism, there are a variety of cells. Some are long while others are short; some are circular while some are oval. Shape and size vary from cell to cell according to their functions and composition. For example, a nerve cell is long and branched, meant for the transmission of signals throughout our body while a muscle cell is small and spindle-shaped which helps in movement.

Considering an animal cell, we can generalize the shape of a cell as round (spherical) or irregular. Plant cells are much more rigid and rectangular in shape. The size of a cell can be as small as 0.0001 mm (mycoplasma) and as large as six to twelve inches (Caulerpa taxifolia). Generally, the unicellular organisms are microscopic, like bacteria. But a single cell like an egg is large enough to touch. Whether regular or irregular in shape, they all consist of the same organelles and help us to perform the daily activities efficiently.
To learn more about the cell and its organelles, visit BYJU’S Biology.
Also Read:
Why Do Cells Have Different Shapes And Size?
Important MCQs with Solutions on Cell Organelles