06/08/2025.
11/08/2025
Name………………………….Adm No……
St. Marys’ Lwak Girls’ High School.
Biology – Form 2 North A
Holiday Assignment.
Topic: Respiration.
Instruction: Answer all questions in the spaces provided.
1. Define respiration (1 mark)
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2. State three uses of the energy from respiration in the body of animals (3 marks)
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3. a). Name the organelle in which adenosine triphosphate is formed (1 mark)
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b). How is the organelle named above adapted to its functions? (2 marks)
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4. The illustration below shows a common investigation in experimental biology. Use it to answer the
questions that follow. The glucose solution was first boiled, then cooled before adding yeast
suspension. Oil layer was finally added to the mixture.
a) Why was the glucose solution boiled first? (1 mark)
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pg. 1 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
b) Why was the boiled glucose solution cooled before adding yeast solution? (1 mark)
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c) What was the process being investigated? (1 mark)
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d) State two possible aims of this experiment (2 marks)
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e) i). State the observation made in the tube B (1 mark)
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ii). Account for the observation made above (2 marks)
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f) Write a word equation for the reaction taking place in tube A (1 mark)
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g) Suggest a control experiment (1 mark)
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h) Highlight two economic applications of the process being investigated (2 marks)
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5. Define oxygen debt. (1 mark)
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6. (a) Highlight three differences between aerobic respiration and anaerobic respiration (3marks)
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(b) Lipids release a lot of energy when oxidized. However, they are not the preferred respiratory substrate. Give two
reasons (2 marks)
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pg. 2 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
7. Explain why:
a) One breathes heavily during strenuous exercises (2 marks)
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b) A dog weighing 15.2 kg requires 216Kj while a mouse weighing 50g requires 2736 KJ per day. Explain (2marks)
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8. State two ways in which respiratory quotient is useful. (2 marks)
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9. The set ups below were used to investigate a process in viable seeds. In set up A the seedswere disinfected and
moistened with sterile water. In set up B, the seeds were boiled, disinfected and moistened with sterile water. In set
up C, the seeds were boiled and moistened, they were not however, disinfected.
a) What was the aim of the experiment A? (1 mark)
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b) What is the significance of using?
i. A vacuum flask in the experiment (1 mark)
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ii. Cotton plug in the experiment (1 mark)
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c) Explain why it was important to disinfect the seeds in A? (2 marks)
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d) Account for the observations in:
pg. 3 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
i. Set up A (2 marks)
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ii. Set up B (2 marks)
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e) What is the expected observation in C after some time? Explain (2 marks)
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10. Highlight any four factors that can control the rate of respiration (4 marks)
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11. The diagram below represents a simple respiratory pathway in cells
(a) Name the process marked X and Y
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Y …………………………………………………………..……………………
(b) Name substance B and condition under which it is formed (2marks)
Substance…………………………….
Condition ……………………………..
(c).State two differences between process X and Y (2marks)
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12. State three conditions that are required for aerobic respiration to take place (3marks)
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pg. 4 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
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13. Write a word equation for anaerobic respiration in animals (1mark)
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14. The diagram below shows an experiment to illustrate a Biological process.
(a) State the aim of the experiment. (1mark)
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(b) State the role of potassium hydroxide in tube 1. (1mark)
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(c) State the observations made in tube 2 and 3. (2 marks)
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(d) Explain your observations given that both tube 2 and 3 contains limewater. (2 marks)
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(e) Suggest a suitable control experiment for this set up. (1mark)
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15. Explain how anaerobic respiration is used in (2marks)
(i) Sewage treatment………………………………………………………………………………….
(ii) Beer making………………………………………………………………………………………
16. During an investigation of a certain metabolic reaction, students set up the apparatus as shown below.
pg. 5 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
(a). Identify the physiological process being investigated. (1mark)
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(b). State the observation madew in the conical flask after 30 minutes (1mark)
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(c) Account for the observation made in the conical flask after 30 minutes. (2marks)
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(d). State how you could set up a control experiment in the above set up (1mark)
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17. (a) Distinguish between gaseous exchange and respiration (2marks)
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(b) Name the products of anaerobic respiration in plants (1mark)
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18. (a) State two phases of aerobic respiration. (2marks)
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(b) With a reason, state the phase that yields more energy (2marks)
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19. The equation below shows respiration for a certain food substrate. Study it and answer questions
that follow: 2C51H98O6 + 145O2 102CO2 + 98H2O
(a) Calculate the respiratory Quotient, RQ (2marks)
(b) Suggest with reasons the possible food substrate (2marks)
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pg. 6 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
20. The diagram below illustrates an experiment to determine the rate of a certain process in a small
insect.
(a) State the changes observed after the experiment has run for five minutes. (1 mark)
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(b) Account for the changes observed in (a) above. (4 marks)
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(c) Why is it necessary to place the flask in a water bath? (1 mark)
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(d) Name the organelle involved in the process under investigation and the significance of this (2 marks)
Organelle ……………………………………………………………………………………………………………………………………………………..…….
Significance ………………………………………………………………………………………………………………………………………………………
pg. 7 © Lwak Girls’ High School. Biology Department August Holiday Assignment.
