Year 7 Biology: Cell Organisation

Introduction to Cell Organisation

Hello Year 7! Today, we’re going to learn about something very important in biology: Cell Organisation. Cells are the building blocks of all living things. Just like how you need bricks to build a house, you need cells to build living organisms.

What is Cell Organisation?

Cell organisation is how cells are arranged to form structures in living organisms. Think of it like a team. Each player has a role, and when they work together, they create something amazing!

Levels of Organisation

There are different levels of organisation in living things:

1. Cells: The smallest unit of life. Every living thing is made of cells. For example, a red blood cell carries oxygen in your body.
2. Tissues: A group of similar cells working together. For example, muscle tissue helps us move.
3. Organs: Different types of tissues working together. For instance, the heart is an organ made of muscle tissue, connective tissue, and more.
4. Organ Systems: Groups of organs that work together. For example, the circulatory system includes the heart, blood vessels, and blood.
5. Organisms: A living thing made up of many organ systems. For example, you are an organism!

Examples to Remember

• Cell: A plant cell that helps with photosynthesis.
• Tissue: Nerve tissue that helps us feel and react.
• Organ: The lungs, which help us breathe.
• Organ System: The digestive system, which helps us break down food.
• Organism: A tree, a cat, or even you!

Key Rules to Understand

1. Cells are the smallest unit of life: Every living thing is made of cells.
2. Tissues are made of cells: Similar cells work together to perform specific functions.
3. Organs are made of tissues: Different tissues come together to do a job.
4. Organ systems are made of organs: Different organs work together for complex functions.
5. All these levels work together: They are all important for a living organism to function properly.

Tips and Tricks

• Visualise: Draw diagrams of cells, tissues, organs, and systems to see how they relate.
• Compare: Think of examples from your body or nature. This helps you remember.
• Use Mnemonics: For example, to remember the levels: “Can Turtles Only Organise Oysters?” (Cells, Tissues, Organs, Organ Systems, Organisms).

Questions About Cell Organisation

Easy Level Questions

1. What is the smallest unit of life?
2. What do we call a group of similar cells?
3. Name one example of a tissue.
4. What is an organ?
5. What system includes the heart?
6. What do we call a living thing?
7. Name one organ in the human body.
8. What type of cell carries oxygen?
9. What is the function of muscle tissue?
10. How many levels of organisation are there?
11. Is a leaf a cell or an organ?
12. What does the circulatory system do?
13. What type of cell helps plants make food?
14. Which organ helps us breathe?
15. What is the role of connective tissue?
16. Can organisms be made of only one cell?
17. What does an organ system consist of?
18. Name an example of an organism.
19. What do we call cells that work together?
20. Which level of organisation is made of different tissues?

Medium Level Questions

1. Explain the difference between a cell and a tissue.
2. Give an example of an organ and its function.
3. What is the relationship between organs and organ systems?
4. Why are cells important for living things?
5. Describe the role of the heart in the circulatory system.
6. What is the role of the lungs in the respiratory system?
7. How do cells form tissues?
8. Name the four types of tissues in animals.
9. How do different organ systems work together?
10. Why is it important for cells to be organised?
11. Give two examples of plant organs.
12. What type of tissue is found in the stomach?
13. What is the function of nerve tissue?
14. Can a tissue work without cells? Why or why not?
15. What happens if an organ system fails?
16. What is the role of the digestive system?
17. How does muscle tissue help us?
18. What kind of cells make up skin tissue?
19. How do cells communicate with each other?
20. Why do some organisms have more complex organisation than others?

Hard Level Questions

1. Discuss how cells differentiate into various types of tissues.
2. Explain the importance of the cell membrane in cell organisation.
3. How do organ systems interact to maintain homeostasis?
4. Compare and contrast plant and animal cells.
5. What role do stem cells play in tissue regeneration?
6. How does the structure of the heart relate to its function?
7. Explain the process of how tissues form organs.
8. What is the significance of having specialised cells in multicellular organisms?
9. How do organ systems contribute to the overall health of an organism?
10. Describe how muscles and bones work together as an organ system.
11. What factors can affect the health of an organ?
12. How does the nervous system control other organ systems?
13. Explain the role of enzymes in the digestive system.
14. How do environmental factors influence cell organisation?
15. Discuss how cancer cells differ from normal cells in the context of cell organisation.
16. What is the relationship between DNA and cell function?
17. How can understanding cell organisation help in medicine?
18. Describe how plants and animals transport nutrients differently.
19. What would happen if one type of tissue was damaged?
20. How does cell communication impact tissue function?

Answers to Questions

Easy Level Answers

1. Cell
2. Tissue
3. Muscle tissue
4. An organ is a structure made up of tissues.
5. Circulatory system
6. Organism
7. Heart, lungs, etc.
8. Red blood cell
9. It helps us move.
10. Five
11. Organ
12. It helps us breathe.
13. Chloroplast cell
14. Lungs
15. Supports and connects other tissues.
16. Yes, those are called unicellular organisms.
17. A group of organs
18. A tree, a cat, a human
19. Tissues
20. Tissues

Medium Level Answers

1. A cell is the basic unit of life, while a tissue is a group of similar cells working together.
2. The heart pumps blood.
3. Organs perform functions and work together in organ systems.
4. Cells are the building blocks of life.
5. The heart pumps blood throughout the body.
6. Lungs take in oxygen and release carbon dioxide.
7. Similar cells join to perform a specific function.
8. Muscle, nerve, connective, and epithelial tissue.
9. They work together to keep the organism alive.
10. Organised cells function more effectively.
11. Roots and leaves
12. Muscle tissue helps in digestion.
13. It sends signals throughout the body.
14. No, tissues need cells to function.
15. The organism may not survive.
16. It breaks down food into nutrients.
17. Muscle tissue contracts for movement.
18. Skin cells
19. They send signals to each other.
20. Some organisms are single-celled; others are multicellular.

Hard Level Answers

1. Cells become specialised to perform specific functions.
2. The cell membrane controls what enters and leaves the cell.
3. They work together to keep the body stable.
4. Plant cells have a cell wall; animal cells do not.
5. They can develop into different types of tissues.
6. Its structure allows efficient blood pumping.
7. Tissues with similar functions come together to form organs.
8. Specialised cells perform unique functions for survival.
9. Organ systems ensure the body operates properly