Biology
Grade-9
Easy
Question
Which of the following statement is correct?
- Cells vary in size and shape.
- Cells are of the same size.
- All cells are round and big in size.
- All cells look the same.
Hint:
Cells vary in size shape structure. The size of the cells varies greatly (0.1mm to 18 cm).
Smallest cell – Cells of Mycoplasma gallisepticum (0.1mm)
Longest cell – Nerve cells in Humans (1m long)
Largest cell – Egg of an Ostrich (central yellow sphere) (18cm)
Cells are generally very small and are seen only with microscope.
The small size of the cell provides –
1 mm = 10-6 meter or 10-3 millimeter
Larger an organism, greater the number of cells in the body.
The correct answer is: Cells vary in size and shape.
- 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
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