OBJECTIVES
1. In cellular respiration energy is made available to organisms by
A. removal of a phosphate group from ADP.
B. breaking off a phosphate group from ATP.
C. adding a phosphate group to glucose.
D. breaking off a hydrogen ion from NADPH.
2. Respiration is an essential life process providing the living cells with
A. oxygen.
B. sugars.
C. energy.
D. carbon dioxide.
3. A group of rats placed in an air-tight box for come hours died because they
A. breathed in air containing nitrogen.
B. produced carbon dioxide.
C. ran short of. energy.
D. used up the available oxygen.
4. The muscle cell fluid of an athlete was tested immediately after a 100 m race and was found to contain a high concentration of lactic acid. Explain what could have caused this. The
A. athlete must have eaten food containing lactic acid just before the race.
B. Athlete must have injected lactic acid into his blood just before the race.
C. athlete’s muscle must have carried out anaerobic respiration during the race.
D. athlete must have inhaled lactic acid from the environment during the race.
5. Anaerobic respiration results in the production of
A. more energy than aerobic respiration.
B. no energy.
C., an equal amount of energy to aerobic respiration.
D. less energy than aerobic respiration.
6. Kreb’s cycle occurs in the
A. mitochondria.
B. Cytoplasm.
C. nucleus.
D. ribosomes.
7. Which of the following are the final products of aerobic respiration?
A. Water, carbon dioxide and energy.
B. Pyruvic acid, carbon dioxide and water.
C. Glucose, energy and urea.
D. Energy and carbon dioxide.
8. In aerobic respiration, oxidative phosphorylation takes place in the
A. cytoplasm.
B. mitochondria.
C. lysosome:
D. vacuoles.
9. The role of ATP include all the following activities except
A. provision of energy to do work in living organisms.
B. transmission of nerve impulse.
C. keeping the body warm in homoithermic animals.
D. producing water during aerobic respiration.
10. When a mammal respires anaerobically for a long time
A. pyruvic acid is converted into acetyl COA.
B. more energy is released from fats in the body.
C. lactic acid accumulates in the muscles.
D. the Kreb’s cycle is fully completed.
11. In cellular respiration, energy is stored in the from
A. adenosine diphosphate (AD).
B. adenosine monophosphate (AMP).
C. adenosine triphosphate (ATP).
D. heat energy.
12. The process of anaerobic respiration of yeast in. sugar solution is known as
A. oxidation.
B. fermentation.
C. tissue respiration.
D. alcohol production.
13. In the anaerobic stage of respiration, the net ATP molecules produced per glucose molecule is
A. one.
B. two.
C. three.
D. four.
14. During anaerobic respiration in skeletal muscles, pyruvic acid is
A. reduced to lactic acid.
B. oxidised to ethanol.
C. oxidised to lactic acid.
D. reduced to water.
15. Muscle fatigue in the body of an athlete is due to
A. low pH.
B. high oxygen content.
C. accumulation of lactic acid.
D. accumulation of carbonic acid.
16. Anaerobic respiration in the organism illustrated in the diagram below produces carbon dioxide and
A. ethanol.
B. water.
C. oxygen.
D. glucose.
17. In an experiment, mould and yeast cells were transferred into an environment with low oxygen concentration. After a few days, the mould died while the yeast cells did not. Which of the following statements best explains the above observation?
A. The yeast cells carried out photosynthesis while the mould did not
B. Photosynthesis does not take place in the absence of oxygen
C. Respiration can take place in yeast cells in the absence of oxygen
D. Respiration does not occur in the mould.
18. The reagent used in testing for carbon (IV) oxide is
A. Copper sulphate solution.
B. Lime water.
C. Hydrochloric acid.
D. Sodium hydroxide solution.
The diagram below is an illustration of a mango leaf drawn by a student in a Biology test. The student failed the test. Study it and answer questions 19 and 20.
19. The likely reason why the student failed the test was that the
A. labels were wrong and the guidelines were not touching the structures.
B. net venation shown were few, rough, not properly drawn and wrongly placed.
C. leaf was too tapered at the apex, the leaf stalk was too short and the shape of leaf was wrong.
D. leaf venation should have been parallel and the midrib should be thicker.
20. Which other features of the diagram, if shown, would have earned the student more marks? The
A. colour and size.
B. title and magnification.
C. habitat and agricultural qualities of leaf.
D. spelling of label and length of midrib.
THEORY
1. (a) What is respiration? (b) What is oxygen debt. (c) Outline three activities that can result in oxygen debt. (d) In a tabular form, state four differences between gaseous exchange and aerobic respiration.
2. Write the chemical equation for each of the following processes (a) aerobic respiration (b) anaerobic respiration in plant (c) anaerobic respiration in animal.
3. (a) Describe briefly the process involved in the breakdown of glucose in the cell of living organisms to produce energy (ATP) (b) State two conditions under which glycogen can be converted to glucose to produce energy.
4. Name the two types of respiration and write a balanced equation to summarize each of them.