Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
CHAPTER 3 EXCRETION SUBJECTIVE QUESTIONS 3.1 Human Excretion 1 Complete the table below by stating the method of excretion and excretory materials for the following excretory organ. Excretory organ (a) Skin (b) Lungs (c) Kidneys 2 Method of excretion Excretory materials Fill in the blanks with the words given. skin toxic water excretion (a) The process of removing waste products, produced during chemical processes in the cells, is called ___________________. (b) If wastes are not removed, _____________ substances build up and these can damage organs in the body. (c) The excretory products of humans are _____________ , carbon dioxide, urea and mineral salts. (d) The excretory organs of humans are lungs, _________ and the kidneys. 3.2 The Urinary System in Humans 3 Tick the statements below that are true. (a) The kidneys are located at the back of the body and form the main organs of the urinary system. (b) The function of the kidney is to remove water and carbon dioxide. (c) 4 The kidneys are bean-shaped and roughly the size of a fist. Name the parts of the human urinary system based on the following functions. Parts of urinary system in human (a) Tube that carries urine from the kidney to the bladder Excretory organ that removes wastes like urea,water and mineral salts from the blood into the urine Tube that carries urine from the bladder for removal Temporary storage for the urine before removal (b) (c) (d) 5 Function Label the human kidney using the words given. Cortex Artery Ureter Medulla Vein Pelvis of kidney (a) (f) (b) (c) (e) (d) 3.3 Excretion in Plants 6 Underline the correct word in the brackets so that each sentence becomes a true statement. (a) Plants excrete water, [urea, mineral salts], oxygen, carbon dioxide and other nitrogenous wastes. (b) Plants excrete their waste products by simple diffusion through the cell [wall, membrane] and through the stomata. OBJECTIVE QUESTIONS 3.1 Human Excretion 1 Which of the following excretory products are excreted through the lungs? A Water and urea B Water and mineral salts C Carbon dioxide and salts D Carbon dioxide and water 2 All the following are excretory organs except A skin C lungs B heart D kidneys 3.2 The Urinary System in Humans 3 Which of the following is not a function of the kidneys? A It removes urea from the body B It controls the pH of the blood C It removes excess sugar in the blood D It regulates the amount of water and mineral salts in the body 4 Diagram 1 shows the cross section of the human kidney. P Q S R Diagram 1 Which part marked P, Q, R and S carries urine from the kidney to the urinary bladder? A P C R B Q D S 5 Which of the following are not true? A B C D Excretory product Water Mineral salts Urea Carbon dioxide Excretory organ Kidneys Skin Lungs Lungs 3.3 Excretion in Plants 6 Which of the following excretory products from plants can be used to relieve pain? A Latex C Resin B Tannin D Caffeine 7 Which of the following plants produce latex? A Soya C Rubber tree B Coconut tree D Sunflower plant REVISION 1 Which of these are excretory organs? I II III A B 2 I an II only I and III only C II and III only D I, II and III Which of the following excretory product does not match? A B C D Excretory organs Kidney Lungs Skin Skin Excretory product Mineral salts Water Urea Carbon dioxide 3 Diagram 1 shows the human urinary system. Vena cava Right kidney Aorta Left kidney J K L Diagram 1 (a) Name the parts labelled J, K and L. J : _______________________________ K : _______________________________ L : _______________________________ 4 (b) State the function of the kidneys. __________________________________________ (c) Describe what happens to the body when both kidneys fail. __________________________________________ __________________________________________ (d) State how kidney failure can be treated. __________________________________________ __________________________________________ The following information describes the excretion of plants. (a) Some of the excretory products in plants are useful to humans while others are poisonous. State three excretory products of plants that are harmful to humans. ___________________________________________ (b) ___________________________________________ Name the parts of plants that will eliminate the following excretory products. (i) Latex _______________________________________ (ii) Quinine ________________________________________