Summative Practice Chapter 8 – Question 6 & 7 (Form 4 Biology Textbook Exercise and Answer)

Question 6:One of the effects of emphysema is the loss of elasticity in the alveolus. Explain the effect of this on gaseous exchange. Answer:Less air is inhaled and exhaled, making breathing difficult. Air trapped in the alveoli may cause the alveoli to burst, producing a large air space in the alveoli. This means less total … Read more

Summative Practice Chapter 8 – Question 1 – 5 (Form 4 Biology Textbook Exercise and Answer)

Question 1:Explain why a transportation system is not required to transport respiratory gases in insects. Answer:Each cell in an insect’s body is supplied with a tracheole that directly enters the cell to enable gaseous exchange. Question 2:Why are the lungs of amphibians not as efficient as human lungs? Answer:Amphibians do not have rib cage and … Read more

Formative Practice 8.4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:What are the effects of chronic bronchitis on the bronchiole? Answer:Bronchioles become inflamed, swollen and clogged. Question 2:Explain the condition of bronchiole walls in asthmatic patients. Answer:The bronchiole walls swell and thicken. The opening of bronchiole tube becomes smaller and the airway becomes narrower. Question 3:How does the usage of an inhaler help an … Read more

Formative Practice 8.3 (Form 4 Biology Textbook Exercise and Answer)

Question 1:What is the value of the partial pressure of oxygen in the atmospheric pressure? Answer:The partial pressure of oxygen is 160 mm Hg. Question 2:In what form is carbon dioxide transported in human blood circulatory system? Answer:Carbon dioxide is transported in the form of bicarbonate ion, carbonic acid and carbaminohaemoglobin. Question 3:Explain how carbon … Read more

Formative Practice 8.2 (Form 4 Biology Textbook Exercise and Answer)

Question 1:State the function of the spiracle in the breathing mechanism of insects. Answer:Spiracles are air pores that connect the respiratory structure of insects with the external environment. Question 2:How do abdominal muscles help insects to breathe? Answer:• During inhalation, the abdominal muscles relax and the spiracle valves open. This reduces the internal pressure of … Read more

Formative Practice 8.1 (Form 4 Biology Textbook Exercise and Answer)

Question 1:State the adaptations of the human respiratory structure. Answer:• The large number of alveoli provides a large surface area for gaseous diffusion.• The inner lining of alveoli is always moist and enables respiratory gases dissolve in it• The alveoli are covered with a dense network of blood capillary that speeds up the diffusion of … Read more