Science 7 · Unit 1: Cells · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. What is a tissue?

   • several organs that work together
   • a single cell with a special job
   • a whole living thing
   • a group of similar cells that work together
   Check

2. 2. What is an organ?

   • a group of organ systems
   • a structure made of several different tissues working together
   • a group of identical cells
   • the smallest living unit
   Check

3. 3. Which list is in order from smallest to largest?

   • tissue, cell, organ, organ system
   • cell, tissue, organ, organ system
   • organ system, organ, tissue, cell
   • cell, organ, tissue, organ system
   Check

4. 4. Match each word to an example.

   • cell
   • tissue
   • organ
   • organ system

   • muscle
   • the stomach
   • the digestive system
   • a neurone
   Check

5. 5. True or false: an organ system is made of several organs working together.

   • True
   • False
   Check

6. 6. Is a leaf a cell, a tissue, an organ or an organ system?

   • an organ system
   • a cell
   • an organ
   • a tissue
   Check

7. 7. A layer of palisade cells in a leaf, all doing photosynthesis, is an example of

   • a cell
   • an organ
   • an organ system
   • a tissue
   Check

8. 8. Which organ system transports substances like oxygen and food around the body?

   • respiratory system
   • circulatory system
   • nervous system
   • digestive system
   Check

9. 9. Which organs belong to the circulatory system?

   • stomach and liver
   • lungs and windpipe
   • heart and blood vessels
   • brain and nerves
   Check

10. 10. Which organs are part of the digestive system?

    • stomach and intestines
    • brain and spinal cord
    • lungs and trachea
    • heart and blood vessels
    Check

11. 11. What is the job of the respiratory system?

    • pumping blood around the body
    • carrying messages to the brain
    • taking oxygen into the body and getting rid of carbon dioxide
    • breaking down food
    Check

12. 12. Which organs are part of the respiratory system?

    • lungs and trachea
    • stomach and intestines
    • brain and nerves
    • heart and blood vessels
    Check

13. 13. Which organ system helps different parts of the body communicate with each other?

    • circulatory system
    • nervous system
    • respiratory system
    • digestive system
    Check

14. 14. Which organs belong to the nervous system?

    • stomach and intestines
    • lungs and trachea
    • brain and spinal cord
    • heart and arteries
    Check

15. 15. Match each organ system to its job.

    • digestive system
    • respiratory system
    • circulatory system
    • nervous system

    • takes in oxygen
    • transports substances
    • carries messages
    • breaks food down and absorbs it
    Check

16. 16. Hydra's outer layer is made of many similar cells. Is it a cell, a tissue or an organ?

    • a cell
    • an organ system
    • an organ
    • a tissue
    Check

17. 17. Is a Hydra sting cell a cell, a tissue or an organ?

    • an organ system
    • an organ
    • a cell
    • a tissue
    Check

18. 18. A Hydra's tentacle is made of two layers of tissue and is used for catching food. Is a tentacle a cell, a tissue or an organ?

    • an organ system
    • an organ
    • a cell
    • a tissue
    Check

19. 19. Hydra breaks down food in its digestive cavity. Does Hydra have a digestive system?

    • No. Hydra does not digest its food.
    • No. A system is several organs working together, and Hydra's cavity is just lined by a layer of cells.
    • Yes. It has a stomach and intestines like a human.
    • Yes. Any animal that eats has a digestive system.
    Check

20. 20. Which three parts of a sting cell are found in most animal cells?

    • nucleus, cytoplasm and cell membrane
    • trigger, coiled thread and nucleus
    • nucleus, cell wall and chloroplasts
    • cell wall, cytoplasm and sap vacuole
    Check