Division of Labour in Multicellular Organisms

Multicellular organisms exhibit a complex organization where different tasks are carried out by specific groups of cells. This arrangement is known as the division of labour.

Understanding Cell Specialization

The core principle behind the division of labour in multicellular organisms is cell specialization. This means that cells within the organism are not all the same; instead, they differentiate and develop specific structures and functions to perform particular jobs efficiently. For example:

• Nerve cells specialize in transmitting signals.
• Muscle cells specialize in contraction and movement.
• Red blood cells specialize in oxygen transport.

This specialization allows for greater efficiency and complexity in the organism's overall functioning compared to a situation where all cells perform every task.

Evaluating the Options

Let's analyze why Option B is the best explanation:

• Option 1: All cells perform the same function in an organism - This is incorrect. If all cells performed the same function, complex organisms could not exist, and efficiency would be very low.
• Option 2: Different cells have specialized functions - This accurately describes the division of labour. Specialized cells work together in tissues and organs to carry out the organism's life processes.
• Option 3: Multicellular organisms have only one type of cell - This is incorrect. Multicellularity implies diversity in cell types to perform various functions.
• Option 4: Each body part is made of a single cell - This is incorrect. Body parts are composed of many cells organized into tissues, organs, and systems. Single-celled organisms (like amoebas) operate this way, not multicellular ones.

Therefore, the concept of different cells having specialized functions is the best explanation for the division of labour observed in multicellular organisms.