Page 126 - Knowledge Organiser Yr7 24-25

Knowledge Base: Science 7.3 Cells Year 7
7. Levels of Organisation
7.1 What is a multicellular organism?
7.2 What is a tissue?
7.3 What is an organ?
7.4 What is an organ system?
An organism made up of many cells. A group of cells working together.
A group of tissues working together. A group of organs working together.
8. Movement of Substances
8.1 Name two substances all cells in the body require.
8.2 Name an example of a waste product produced by cells.
8.4 How do substances move in and out of cells?
9. Unicellular Organisms
9.1 What is a unicellular organism?
Glucose and oxygen. Carbon dioxide.
By diffusion.
An organism made of only one cell.
8.3
In the body, how are substances delivered to and taken away from the cells?
By the blood.
7.5
What is a specialised cell?
A cell which is designed to carry out a particular function .
7.6
Name four examples of specialised cells.
Nerve cells, red blood cells, sperm cells, root hair cells.
7.7
Name three examples of tissues and their function in the organism.
• Nervous tissue which is made of cells that transmit messages around the body.
• Muscle tissue which is made of cells which contract to make the body move.
• Xylem tissue which is made of cells which form a tube to carry water in the plant.
7.8
Name three examples of organs and their functions in the human body.
• The heart to pump blood.
• The stomach to digest food.
• The brain to control the body.
7.9
Name two examples of organs and their functions in the plant.
• The leaf to absorb sunlight.
• The roots to anchor the plant into the ground and to take up water and minerals from the soil.
7.10
Name three examples of organ systems and their functions in the human body.
• The circulatory system to transport materials around the body
• The respiratory system to take in oxygen from the air and remove carbon dioxide from the body
• The reproductive system to produce new organisms
9.2
Name three examples of unicellular organisms
Amoebas, euglenas and bacteria.
9.3
What is the function of the flagella in unicellular organisms?
Tail-like structures which help them move.
9.3
Name two ways amoebas are able to survive
• No fixed shape and can move by changing the shape of the body.
• Eat plant cells and bacteria by engulfing.
9.4
Name three ways euglenas are able to survive
• Contain chloroplasts to make their own food by photosynthesis.
• Have an eye spot to detect light.
• Have flagella to move.
9.5
How are bacterial cells different to animal and plant cells?
They have no nucleus, the genetic information (DNA) is free in the cytoplasm.
9.6
Draw and label a bacterial cell
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