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The division of labour occurs in:
only unicellular organisms
only multicellular organisms
neither unicellular nor in multicellular organism
both unicellular and multicellular organisms
both unicellular and multicellular organisms
Division of labour occurs in multicellular organisms, where different cells, tissues, and organs are specialised to perform specific functions necessary for the organism's survival. In contrast, unicellular organisms perform all life processes within a single cell.
Division of labour occurs in multicellular organisms, where different cells, tissues, and organs are specialised to perform specific functions necessary for the organism's survival. In contrast, unicellular organisms perform all life processes within a single cell.
Think of a unicellular organism as a one-person shop where the owner does everything (cooking, cleaning, billing, and delivery). A multicellular organism is like a large supermarket with specialised departments (bakery, cash counter, stock management, and security) working together efficiently.
MCD: MultiCellular Division тАФ Division of labour belongs strictly to multicellular organisms.
As organisms evolve from unicellular to multicellular forms, a single cell cannot efficiently manage all metabolic activities simultaneously due to constraints of surface-area-to-volume ratio and energy efficiency. Therefore, cells undergo cellular differentiation, dividing various physiological tasks (such as respiration, digestion, and excretion) among specialised groups of cells.
Unicellular organisms (e.g., Amoeba, Paramecium) consist of a single cell that performs all vital life processes.
Multicellular organisms (e.g., humans, higher plants) exhibit cellular differentiation and division of labour.
Division of labour increases the efficiency and complexity of living organisms.
Higher efficiency in metabolic processes
Specialised cells can perform complex functions far beyond the capability of a single cell
Adaptability to diverse environments
Individual specialised cells cannot survive independently outside the organism
Tissue and organ system formation in animals and plants
Medical tissue engineering and regenerative medicine
Option D is correct because division of labour is exclusively found in multicellular organisms.
Unicellular organisms lack tissues, organs, and organ systems.
D is correct тАФ Division of labour occurs in both unicellular and multicellular organisms? Wait, let's verify standard biology textbooks: Division of labour is prominently a feature of multicellular organisms, though sometimes intracellular organelles show division of labour. However, in standard Indian school biology (NCERT Class 9), 'division of labour' is specifically attributed to multicellular organisms (e.g., 'In multicellular organisms, there is a division of labour'). Therefore, Option B ('only multicellular organisms') is scientifically standard for basic exams.
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