digestive system I.doc

F.4 Biology Class ExerciseDigestion of food IName: _Class: _Group: _I.True OR false ( 20 marks )1.Faeces is not a metabolic waste.( )2.Faeces contains undigested food only.( )3.Starch and protein molecules are too large to pass through the cell membrane.( )4.During digestion, starch molecules are broken down to smaller and simpler molecules.( )5.Everything we eat is completely digested and used by our bodies.( )6.The liver is a part of the digestive system.( )7.The pancreas is a part of the alimentary canal.( )8.In humans, enzymes must be present for the digestion of food.( )9.In humans, digestion of food takes place in the whole alimentary canal.( )10.Humans cannot digest plant foods.( )11.Humans cannot digest cellulose.( )12.Teeth are not involved in the process of digestion.( )13.The small intestine is for the digestion and absorption of food.( )14.Digestion of food begins in the stomach.( )15.We cannot control the movement of food along the alimentary canal.( )16.The alimentary canal is a long, coiled, hollow muscular tube.( )17.The alimentary canal of a cow is more complicated than that of a man.( ) 18.There are a lot of useful bacteria in the large intestine of a man.( )19.Undigested plant fibres slows down the movement of food along the alimentary canal.( )20.When saliva is heated, it cannot digest food because the enzymes are killed.( )Task II: Concept learning1.The diagrams below show the enzymatic digestion of two types of food molecules : starch and proteinWhich diagram shows the digestion of proteins ? Give a reason to support your answer. ( 3 marks ) Diagram I Diagram II_2.Inside the human body, many important protein molecules require a specific three dimensional shape to function properly. Illustrate this idea by using a suitable example. ( 4 marks )_3.Which part of the alimentary canal is the most important for the nutrition of human