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Science at key stage 3    (Year 8)

Unit 8B: Respiration
Section 11: a. Do other organisms respire in a similar manner?

QCA

Objectives
Children should learn:
  • to turn ideas into a form that can be investigated
  • to make decisions about how to deal with factors which cannot be controlled
  • to use controls for comparisons
  • how to work with living materials

Activities

Outcomes
Children:
  • Ask pupils about the organisms they used earlier in the unit and ask them how they could find out if other living things also produce carbon dioxide during respiration. Provide suitable apparatus for holding living material, eg gauze platform in a boiling tube above a hydrogencarbonate indicator solution.
  • Discuss the selection of living organisms, eg yeast, germinating lentils, small fruit woodlice, maggots, the use of a control apparatus without living material and relevant factors, eg mass of living material, temperature, activity, sensitivity of the indicator, length of time to leave it. Ask the pupils to write a plan for their investigation.
  • identify factors that could affect the quantity of carbon dioxide produced
  • recognise the need for a control

Points to note
  • Pupils should be encouraged to think of the welfare of small animals. It is more convenient to use invertebrates.
  • Germinating lentils are convenient plants and work well.

    • Safety

    • wash hands and wipe the bench with disinfectant after handling live material

Sections in this unit

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This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.
1. a. How do cells use the food molecules absorbed after digestion?
2. b. How do cells use the food molecules absorbed after digestion?
3. c. How do cells use the food molecules absorbed after digestion?
4. d. How do cells use the food molecules absorbed after digestion?
5. a. How does the oxygen needed for respiration reach the tissues of the body?
6. b. How does the oxygen needed for respiration reach the tissues of the body?
7. What happens to the oxygen when it reaches the cells?
8. Checking progress
9. What is the role of the lungs?
10. How are inhaled and exhaled air different?
11. a. Do other organisms respire in a similar manner?
12. b. Do other organisms respire in a similar manner?
13. Reviewing work