Multicellular Organisms

Watch the video...

and answer the questions.

Multicellular Organisms

Multicellular organisms are organismsmade up of many different cells.

Put these words in order of size, largest to smallest.

Cells

Tissues

Organs

Systems

Organism

Cells to OrganismsCell – the basic unit of life.Tissue – a group of cells specialised to perform a particular function.Organ – A structure made of different tissues which are coordinated to perform one or more functions.System – A group of related tissues and organs.

Your body is made on 100 trillion cells. Try to identify the cells

below...

AB

C

D + E

What about plant cells...

FG

Collect a microscope...

• Look down the microscope at 3 different cells which might be found in a multicellular organism.

• Complete the table provided.

Microscopic discoveries...Diagram

Name

Structure

Function

Task

Use the sheet provided to match the cell

to it’s structure and function.

Task• You have been allocated a cell type

in pairs. • Build a model which will show the

key features of your cell type.• Explain how the key structures relate

to their function.• Prepare to present your model and

explanation to the class.

Question Time!1. Why are xylem cells needed in the

root, stem and leaves of a plant?2. Explain how the structure of a red

blood cell makes it suited to it’s function.

3. Explain how palisade mesophyll cells are particularly suited to carrying out photosynthesis.