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Cell Growth and Division

Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells.

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Student-friendly explanation

A cell cannot simply grow indefinitely because its surface area does not keep up with its volume. A very large cell faces difficulty in exchange of materials and control. Therefore, cells grow, copy their genetic material, prepare for division, and then divide to support growth, repair, and replacement.

How to write this in exams

  1. 1

    Start with the exact idea

    Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells.

  2. 2

    Then show how to use it

    State the problem of excessive cell size, mention exchange and control difficulty, then explain that division restores efficient cell size and increases cell number.

  3. 3

    Add one concrete example

    A wound heals because nearby cells divide and replace damaged cells.

  4. 4

    Avoid this incomplete answer

    Writing that a cell divides only when it becomes old is incomplete because division also supports growth and repair.

Definition

Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells.

Example

A wound heals because nearby cells divide and replace damaged cells.

Rule to remember

As cell size increases, volume increases faster than surface area, making exchange of materials less efficient.

Memory hook

Cells divide to stay small enough to work well.

Examples and method

Worked example

During body growth, one fertilised egg divides repeatedly to form many cells, and those cells later specialise for different tissues.

Method to apply

State the problem of excessive cell size, mention exchange and control difficulty, then explain that division restores efficient cell size and increases cell number.

Diagram support

Show a simple cell cycle flow: growth, DNA copying, preparation, and division into two cells.

How CBSE asks it

Questions may ask why division is needed for growth, repair, replacement of worn-out cells, or maintaining cell size.

Avoid common mistakes

Common confusion

Students often think cell division happens only for reproduction, but it is also needed for growth and repair in multicellular organisms.

Common wrong answer

Writing that a cell divides only when it becomes old is incomplete because division also supports growth and repair.

Exam tip

When asked why cells divide, mention surface-area-to-volume limitation and the need for growth or repair.

Quick check

Why does a cell divide instead of growing endlessly?

A cell divides instead of growing endlessly because a very large cell cannot exchange materials efficiently or control all its activities properly.

Answer writing and exam use

1-mark answer

Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells.

2-mark answer

Cell growth and division describe how a cell increases in size, prepares its contents, and divides to form new cells. As cell size increases, volume increases faster than surface area, making exchange of materials less efficient. A wound heals because nearby cells divide and replace damaged cells.

3-mark answer

A cell cannot simply grow indefinitely because its surface area does not keep up with its volume. A very large cell faces difficulty in exchange of materials and control. Therefore, cells grow, copy their genetic material, prepare for division, and then divide to support growth, repair, and replacement. As cell size increases, volume increases faster than surface area, making exchange of materials less efficient. During body growth, one fertilised egg divides repeatedly to form many cells, and those cells later specialise for different tissues. Questions may ask why division is needed for growth, repair, replacement of worn-out cells, or maintaining cell size. Writing that a cell divides only when it becomes old is incomplete because division also supports growth and repair.
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