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Year 9 iGSCE - Biology Organisation

The basic hierarchy of cellular organisation is:

Cells - Tissue - Organ - Organ system.

All living organisms are composed of cells. Cells of the same type make up a tissue, different tissues make up an organ, and different organs working together make an organ system.


As animals are multi cellular, their body is composed of many different types of cells.

Click here for more information on cells

Click here for more information on specialised cells


Similar cells make up a single type of tissue. For example muscle cells make up muscle tissue, nerve cells make up nervous tissue and adipose cells make up adipose tissue.

There are 4 main types of tissue, muscle, nervous, connective and epithelial.

Blood although is a fluid is actually classified as a tissue.

The mesophyll is a tissue in plants responsible for photosynthesis, and Vascular tissue transports materials through the plants body.

Cellular Organisation

Another important tissue in plants, is the xylem and phloem.

They are tubes which assist in the movement of nutrients up and down the plant.

The Xylem transports water from the roots up to the leaves of the plant, while the phloem transports sugar and proteins down the plants.


Various tissues make up a single organ. The stomach can be made up of smooth muscle tissue, epithelial tissue and connective tissue.

These tissues work together to complete a specific function.

Organ Systems

Different organs working together create an organ systems. These organs work together with a common goal.

The image below is a microscopic view of a cross section of a plant.

Can you spot all the Cell, tissues and organ.

Try some questions bellow.

1. Draw the table into your books and place the following in their correct positions.

Phagocytes, Sperm, Epidermis, Xylem, Liver, Blood, heart, ovary, neuron, brain, biceps,

2. Place the following in orders from smallest to largest (10 marks)

 Atom  cell  mitochondria  DNA  Sperm cell Skin cell eye  Brain   digestive system  Human

3. What is a tissue? (1 mark)

4. In plants, leave are an example of a? (3 marks)

A. Organ

B. Organ system

C. Tissue

5. Define an organ system, giving two examples, and listing 1 organ within the systems your chose. (5 marks).

6. Create a Ven-diagram, listing the similarities and differences between plant and animal cells. (6 marks)

                           Plant cell                     Animal Cell




7. Write out the sentence and fill in the blanks as you do.

The __________ are specialised organelles filled with chlorophyll. They are found in plant cells and their main role is to assist in ____________. Another specific feature to plant cells is a ____ _____ made of cellulose.

Organelles like the nucleus and ribosome, float in the _______. A jelly like material.

________ are responsible for cellular respiration and found in both plant and animal cells.

8. Tubes within the plant called the Xylem and _________ transport ______ and food throughout the plant. While water travels ___ the plants, glucose and amino acids travel ______ the plant.

9. What are 4 types of tissues (4 marks)

Click here for an eye dissection

worksheet teacher doc.doc