07 Respiration WS

63 Biology Worksheet Chapter 10: Respiration Name: _________________________ ( ) Class : _________ Date : _________ Section A Multiple Choice Questions Choose the most appropriate answer and write it in the corresponding box below. Qsn 1 2 3 4 5 6 7 8 9 10 Ans Qsn 11 12 13 14 15 16 17 Ans 1 The apparatus shown below is used to investigate whether a person breathes out more carbon dioxide gas than he breathes in. When the person places tube M in his mouth and breathes out, air flows steadily through A T1 and T2 C T2 and T3 B T1 and T3 D T2 and T4 2 Breathing movements are necessary in mammals to maintain in the alveoli A a low concentration of carbon dioxide gas and a low concentration of water vapour. B a low concentration of carbon dioxide gas and a high concentration of oxygen gas. C a high concentration of carbon dioxide gas and a low concentration of oxygen gas. D a high concentration of carbon dioxide gas and a low concentration of water vapour. 3 Which of the following causes a flow of air into the lungs during normal breathing in a mammal? A decreased volume inside the thorax B flattening of the diaphragm C increased pressure inside the thorax D inward movement of the ribcage

64 4 Five processes which take place in living organisms are listed below. 1 release of carbon dioxide 2 release of energy 3 release of oxygen 4 uptake of oxygen 5 uptake of water Which three processes are carried out during aerobic respiration? A 1, 2 and 3 C 1, 3 and 5 B 1, 2 and 4 D 2, 3 and 5 5 Which graph shows the change in lactic acid concentration in a muscle during and after a 10 minute period of vigorous activity. 6 The apparatus in the diagram shows how air enters the lungs during breathing. Which structure represents the diaphragm? 7 Which path does a molecule of oxygen take as it enters the body? A alveolus bronchiole bronchus larynx trachea B alveolus bronchiole bronchus trachea larynx C larynx trachea bronchus bronchiole alveolus D trachea larynx bronchus bronchiole alveolus C D

65 8 The diagram represents an alveolus and its blood supply in the lung of a mammal. What is the region labelled X on the diagram? A a capillary C a pleural membrane B a layer of moisture D a zone of cilia 9 The graph shows the concentration of lactic acid in the blood of an athlete. During which period of time was the athlete exercising? A period P C period Q + R B period Q D period P + Q 10 The shaded area on the graph shows an athlete’s rate of oxygen uptake before, during and after a five-minute period of exercise. An oxygen debt is built up because the maximum