10 Questions
What is the primary difference between unicellular and multicellular organisms?
The number of cells they possess
What is the term used to describe a group of similar cells that perform a specific function?
Tissue
What is the term used to describe two or more organs that perform a common function?
Organ System
How many basic types of tissues are found in complex animals?
Four
What is the benefit of organisation in multicellular organisms?
More efficient and better coordinated activities
What is the level of organisation that exhibits division of labour in the body?
Organs and Organ Systems
What is the result of the organisation of cells, tissues, organs and organ systems in the body?
Better coordination of body functions
What is the characteristic of the organisation of cells in multicellular organisms?
Different groups of cells perform specific functions
What is the term used to describe the body of a simple organism like Hydra?
Made of different types of cells
What is the approximate number of cells in the human body?
Billions
Study Notes
Cellular Organization
- In unicellular organisms, a single cell performs all functions like digestion, respiration, and reproduction.
- In multicellular animals, different groups of cells perform specific functions in a well-organized manner.
Cells and Tissues
- The body of a simple organism like Hydra is composed of different types of cells, with thousands of cells in each type.
- The human body is composed of billions of cells that perform various functions.
- A group of similar cells, along with intercellular substances, performs a specific function, and this organization is called a tissue.
Tissue Types and Organization
- There are only four basic types of tissues in complex animals.
- These tissues are organized in specific proportions and patterns to form organs like stomach, lung, heart, and kidney.
Organs and Organ Systems
- When two or more organs perform a common function through physical and/or chemical interaction, they form an organ system, such as the digestive system, respiratory system, etc.
- Organs and organ systems exhibit division of labor and contribute to the survival of the body as a whole.
- The association of organs forms organ systems, which is essential for more efficient and better-coordinated activities of millions of cells constituting an organism.
Test your knowledge of cellular organisation in living organisms, from unicellular to multicellular structures. Explore the different levels of organisation, tissues, and organs that enable complex functions.
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