Name the five levels of organisation, from smallest to largest.

Organelles Cells Tissues Organs Organ systems

A specialised structure within a cell that carries out a specific function. For example, the mitochondrion is the organelle where aerobic respiration occurs.

A group of similar cells that work together to carry out a particular function.

A structure made up of different tissues working together to perform a specific function.

Define organ system .

A group of organs that work together to carry out a particular function.

Why are cells described as the basic building blocks of living organisms?

Because they are the basic structural and functional units of all living organisms. Unicellular organisms are made from one cell; multicellular organisms are made from collections of cells.

The mitochondrion is an example of an ＿＿＿＿＿＿＿＿, the structure in which aerobic respiration occurs.

The mitochondrion is an example of an organelle , the structure in which aerobic respiration occurs.

Specialised cells form tissues, tissues form organs, and organs form ＿＿＿＿＿＿＿＿.

Specialised cells form tissues, tissues form organs, and organs form organ systems .

True or False? All the cells in a multicellular organism are identical.

False. In complex multicellular organisms, cells are specialised to carry out particular functions, and these specialised cells group into tissues.

True or False? A tissue is made up of different types of organ.

False. It is the other way round — a tissue is a group of similar cells, and an organ is made up of different tissues.

Name four organs of the digestive system.

Oesophagus Stomach Small intestine Large intestine

Name two tissues found in the leaf of a plant.

Epidermis Mesophyll Xylem and phloem are also found in the leaf.

IGCSEScienceEdexcelScience (Double Award)BiologyFlashcards2. Structure & Function in Living OrganismsLevels of Organisation

Levels of Organisation (Edexcel IGCSE Science (Double Award): Biology): Flashcards

Exam code: 4SD0

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FrontLevels of Organisation
Name the five levels of organisation, from smallest to largest.
BackLevels of Organisation
Organelles
Cells
Tissues
Organs
Organ systems
BackLevels of Organisation
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Cards in this collection (14)

Name the five levels of organisation, from smallest to largest.
- Organelles
- Cells
- Tissues
- Organs
- Organ systems
Define organelle.
A specialised structure within a cell that carries out a specific function.
For example, the mitochondrion is the organelle where aerobic respiration occurs.
Define tissue.
A group of similar cells that work together to carry out a particular function.
Define organ.
A structure made up of different tissues working together to perform a specific function.
Define organ system.
A group of organs that work together to carry out a particular function.
Why are cells described as the basic building blocks of living organisms?
Because they are the basic structural and functional units of all living organisms.
Unicellular organisms are made from one cell; multicellular organisms are made from collections of cells.
The mitochondrion is an example of an ＿＿＿＿＿＿＿＿, the structure in which aerobic respiration occurs.
The mitochondrion is an example of an organelle, the structure in which aerobic respiration occurs.
Specialised cells form tissues, tissues form organs, and organs form ＿＿＿＿＿＿＿＿.
Specialised cells form tissues, tissues form organs, and organs form organ systems.
True or False?
All the cells in a multicellular organism are identical.
False.
In complex multicellular organisms, cells are specialised to carry out particular functions, and these specialised cells group into tissues.
True or False?
A tissue is made up of different types of organ.
False.
It is the other way round — a tissue is a group of similar cells, and an organ is made up of different tissues.
Name four organs of the digestive system.
- Oesophagus
- Stomach
- Small intestine
- Large intestine
Which two organs make up the respiratory system?
- Trachea
- Lungs
Which two organs make up the nervous system?
- Brain
- Spinal cord
Name two tissues found in the leaf of a plant.
- Epidermis
- Mesophyll
Xylem and phloem are also found in the leaf.

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