(a) Suggest at which point,, Yor Z, the rate of diffusion of carbon (IV) oxide will be highest. (1 mark) (b) The bronchi and bronchioles are lined with ciliated epithelium tissue and a thin layer of mucus.Describe the role of the cilia and mucus. (2 marks) 16.The diagram below shows part of the tracheal system of a cockroach.Study it and use it to answer the questions that follow: (a) Name the parts labelled A and B. (2 marks) (b) (i)State the role played by the liquid found at the end of the structure labeled B. (1 mark) (ii) State the biological importance of rings found on the wall of the trachea. (1mark) 17 (a)State the part of the brain that control breathing movements in man (1mark) (b)Explain how the aquatic plants are adapted to gaseous exchange (2 marks) 6. State two adaptations of leaves of terrestrial plants for stomatal gaseous exchange . (2 marks) 18 .Carbon (IV)oxide is passed into a solution of bromthymol blue indicator until the acid solution turns yellow.A sprig of elodea is then placed into this yellow solution .After a few hours in the sunlight.. the yellow solution turns blue. (a) State the purpose of this experiment. (1mark) (3 marks) 19. The figure below shows the movement of the ribs and the diaphragm during breathing. (a) Name each of the parts labeled A B and C. (3 marks) (b) (i)Name the breathing process shown in the diagram. (1mark) (1mark) (ii) Give a reason for your answer. (c) State what happens to each of the structures labeled A , B and C during the process shown. (b)Account for the observations.

Question

(a) Suggest at which point,, Yor Z, the rate of diffusion of carbon (IV) oxide will be highest. (1 mark) (b) The bronchi and bronchioles are lined with ciliated epithelium tissue and a thin layer of mucus.Describe the role of the cilia and mucus. (2 marks) 16.The diagram below shows part of the tracheal system of a cockroach.Study it and use it to answer the questions that follow: (a) Name the parts labelled A and B. (2 marks) (b) (i)State the role played by the liquid found at the end of the structure labeled B. (1 mark) (ii) State the biological importance of rings found on the wall of the trachea. (1mark) 17 (a)State the part of the brain that control breathing movements in man (1mark) (b)Explain how the aquatic plants are adapted to gaseous exchange (2 marks) 6. State two adaptations of leaves of terrestrial plants for stomatal gaseous exchange . (2 marks) 18 .Carbon (IV)oxide is passed into a solution of bromthymol blue indicator until the acid solution turns yellow.A sprig of elodea is then placed into this yellow solution .After a few hours in the sunlight.. the yellow solution turns blue. (a) State the purpose of this experiment. (1mark) (3 marks) 19. The figure below shows the movement of the ribs and the diaphragm during breathing. (a) Name each of the parts labeled A B and C. (3 marks) (b) (i)Name the breathing process shown in the diagram. (1mark) (1mark) (ii) Give a reason for your answer. (c) State what happens to each of the structures labeled A , B and C during the process shown. (b)Account for the observations.

Answer 1

1. Y2. The cilia move mucus and trapped particles out of the respiratory tract, while the mucus traps dust, pathogens, and other particles.3. (a) A: Spiracle, B: Tracheole (b) (i) The liquid at the end of the tracheole facilitates the diffusion of gases. (ii) The rings provide structural support to keep the trachea open.4. (a) Medulla oblongata (b) Aquatic plants have thin leaves and large surface areas to facilitate gaseous exchange.5. (a) Numerous stomata, thin leaves6. (a) To demonstrate photosynthesis and the uptake of carbon dioxide.7. (a) A: Rib, B: Intercostal muscle, C: Diaphragm (b) (i) Inhalation (ii) The diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. (c) During inhalation, the ribs move upward and outward, the intercostal muscles contract, and the diaphragm contracts and moves downward.

Answer 2

1. The rate of diffusion of carbon (IV) oxide will be highest at the point where the concentration gradient is steepest.2. The cilia and mucus in the bronchi and bronchioles play a role in trapping and removing particles and pathogens from the respiratory tract.3. The parts labeled A and B in the tracheal system of a cockroach need to be identified.4. The liquid at the end of the structure labeled B aids in gas exchange.5. The rings on the wall of the trachea provide structural support.6. The part of the brain that controls breathing movements in man is the medulla oblongata.7. Aquatic plants have adaptations for gaseous exchange, such as thin leaves and large surface areas.8. Leaves of terrestrial plants have adaptations for stomatal gaseous exchange, such as numerous stomata and thin leaves.9. The purpose of the experiment with bromthymol blue and elodea is to demonstrate photosynthesis and the uptake of carbon dioxide.10. The parts labeled A, B, and C in the diagram of the ribs and diaphragm during breathing need to be identified.11. The breathing process shown in the diagram needs to be named.12. The reason for the breathing process needs to be provided.13. The changes in structures labeled A, B, and C during the breathing process need to be described.

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