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

Questions

1. 1. Which red substance in red blood cells joins with oxygen?

   • cellulose
   • chlorophyll
   • haemoglobin
   • cytoplasm
   Check

2. 2. Red blood cells are smaller than most cells. How does this help them?

   • They can hold more haemoglobin.
   • They do not need any oxygen themselves.
   • They can swim faster than other cells.
   • They can squeeze through the tiniest blood vessels, the capillaries.
   Check

3. 3. What is the job of a red blood cell?

   • carrying messages to the brain
   • digesting food
   • fighting germs
   • carrying oxygen around the body
   Check

4. 4. Which part does a red blood cell NOT have?

   • haemoglobin
   • a nucleus
   • cytoplasm
   • a cell membrane
   Check

5. 5. A specialised plant cell has a cell wall, a large sap vacuole and a long, thin part that sticks out into the soil. What is it?

   • a root hair cell
   • a red blood cell
   • a palisade cell
   • a ciliated cell
   Check

6. 6. How can you tell that a root hair cell is a plant cell and not an animal cell?

   • It has a cell membrane.
   • It has a cell wall and a large sap vacuole.
   • It has chloroplasts.
   • It has a nucleus.
   Check

7. 7. What is the job of a root hair cell?

   • making food by photosynthesis
   • absorbing water from the soil
   • holding the plant up
   • carrying food to the leaves
   Check

8. 8. How is a root hair cell adapted for its job?

   • It has no nucleus, so there is more space for water.
   • It has many chloroplasts to make food.
   • It has a thick wall so nothing can get in.
   • Its long, thin extension lets water move easily into the cell from the soil.
   Check

9. 9. Cell X has tiny hairs on one end, a nucleus, and no cell wall. Cell Y has a cell wall, a sap vacuole and lots of chloroplasts. Which statement is correct?

   • Both are animal cells.
   • X is a plant cell; Y is an animal cell.
   • X is an animal cell; Y is a plant cell.
   • Both are plant cells.
   Check

10. 10. Cell X has cilia on one end, a nucleus and no cell wall. Cell Y has a cell wall, a sap vacuole and lots of chloroplasts. Which parts does cell Y have that cell X does not?

    • a nucleus and cytoplasm
    • cilia
    • a cell wall and chloroplasts
    • a cell membrane
    Check

11. 11. You design a table to compare the structures of two specialised cells. Which is the best layout?

    • a drawing of each cell side by side, with no labels
    • one long sentence describing both cells
    • one row for each cell part, with a column for each cell, saying 'yes' or 'no'
    • a list of all the parts of both cells together
    Check

12. 12. Ciliated cells line the tubes to your lungs. What do their tiny hairs (cilia) do?

    • help the cell swim to the lungs
    • take oxygen into the blood
    • make the air warmer
    • sweep mucus with trapped dust and germs away from the lungs
    Check

13. 13. Palisade cells in a leaf are packed with chloroplasts. Why?

    • to make the leaf strong
    • to take in water from the soil
    • to release energy from food
    • to absorb as much light as possible for photosynthesis
    Check

14. 14. Neurones (nerve cells) can be very long, with many branches. How does this help them?

    • They can carry messages a long way and pass them to many other cells.
    • They can squeeze through capillaries.
    • They can take in more water.
    • They can carry more oxygen.
    Check

15. 15. Match each specialised cell to its job.

    • red blood cell
    • neurone
    • root hair cell
    • palisade cell

    • carries electrical messages
    • takes in water
    • makes food by photosynthesis
    • carries oxygen
    Check