Body Systems. S2 Science. Homework. Holy Cross High School Page 1
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1 Body Systems S2 Science Homework Holy Cross High School Page 1
2 Homework 1 (10 marks) 1. The cells listed below are not matched with their correct description. Match each cell to one correct description and copy them into your jotter. (7) Cell Description Nerve cell White blood cell Muscle cell Sperm cell Cheek cell Egg cell Gut cell Bone cell A thin cell which lines the inside of the mouth A long thin cell which carries messages around the body This cell absorbs food and has a frilly surface This cell defends the body against disease This cell makes bones A large cell which grows into a baby when a sperm joins with it This cell can contract (shorten) and help with movement This cell uses its tail to swim towards the egg to fertilise it 2. The diagram below shows an amoeba which is made of one cell. a. State the term for an organism that is made up of only one cell (1) b. Humans are made up of many cell. State the term that describes organisms such as humans (1) 3. The diagram below shows the number of amoeba that can be seen through a microscope s field of view 1mm Using the information in the diagram, calculate the average height of an amoeba (1) Holy Cross High School Page 2
3 Homework 2 (18 marks) 1. Below is a diagram of the respiratory system a. Name parts labelled 1 to 6 (6) b. Air is made up of many gases. Which gas in humans is: i) Breathed in (inhaled) (1) ii) Breathed out (exhaled) (1) c. The table below shows the composition of air Gas Inhaled air Exhaled air (%) (%) Oxygen 16.0 Carbon Dioxide Nitrogen Noble i) Using values from the table, express the percentage of oxygen to carbon dioxide in exhaled air as a ratio in its simplest form (1) ii) Calculate the percentage of oxygen present in inhaled air. (1) Holy Cross High School Page 3
4 2. The diagram below represents the skeletal system a. Name the bones labelled 1 to 4 from the human skeleton (4) b. State the function (the job) of bones 1 to 4 in the human body (4) Holy Cross High School Page 4
5 Homework 2 (12 marks) 1. Copy and complete the sentences below using the word bank provided. (5) a. Arteries carry blood the heart. b. Blood reaches our cells through capillaries. Here passes from the into the cells. c. Veins carry blood the heart. back to blood away from oxygen oxygen rich oxygen poor 2. Below is a diagram of the heart. Name the heart chambers labelled A B C & D. (4) 3. During exercise the heart beats faster and the pulse increases. Give a reason why this happens. (2) 4. Results from a heart rate experiment are shown below. Calculate the average heart rate for Rachel (1) Student Heart Rate (bpm) Trial 1 Trial 2 Trial 3 Average John Alex Rebecca Rachel Holy Cross High School Page 5
6 Homework 3 (14 marks) 1. Copy and complete the sentences below in your jotter using words from the box. (8) a. We need a diet to stay healthy b. We need to eat foods to provide the body with energy. These food groups are and c. Examples of food that are carbohydrates are and d. Fats are found in foods such as and e. We need to eat foods rich in to build up muscles f. Foods such as and contain protein g. We can only live for a few days without We obtain water from our and h. Vitamins and are needed in very small quantities They help build healthy and teeth meat oil sugar balanced bones water fats minerals milk food butter carbohydrates drink bread proteins 2. Scientists can check what food stuffs are made up of by testing with chemicals (reagents) and noting if there is a colour change. The colour change indicates the presence of the food group. Copy and complete the table using a ruler, naming the chemical used and stating the colour change expected for a positive result. Fat has been completed for you. Food Group Starch Sugar (Glucose) Protein Chemical/substance used (reagent) Colour Change Fat Filter paper Opaque to transparent (6) Holy Cross High School Page 6
7 Homework 4 (10 marks) 1. Define the term digestion (1) 2. Use notes in your jotter to copy and complete the table below (7) Part of Digestive System Function (the job that it does) Mouth Gullet (oesophagus) Stomach Small intestine Large Intestine Rectum Anus 3. Name the special molecules that carry out and speed up digestion (1) 4. Name the fluid that carries the products of digestion around the body to cells (1) Holy Cross High School Page 7
8 Homework 5 (13 marks) 1. Name organs 1 to 5 of the digestive system shown below (5) Enzymes are special chemicals that act like biological scissors. Describe what enzymes do to large insoluble molecules of food (1) 3. Saliva found in the mouth contains an enzyme. a. Name this enzyme (1) b. What molecule does this act on? (1) c. What is the product of this reaction? (1) d. What reagent would you use to test for this product? (1) 4. State the small molecule that is made when carbohydrates are broken down. (1) 5. Proteins are large molecules which can be broken down into smaller products by the digestive system. Name these smaller products (1) 6. Fatty acids and glycerol are the two soluble products of what large food group? (1) Holy Cross High School Page 8
9 Homework 6 (12 marks) 1. The apparatus below represents the model gut of a human. Starch and amylase a. The visking tubing contained starch. How would you test for the presence of starch? (2) b. Using the diagram above which part of the apparatus represents the i) Blood (1) ii) Food being digested (1) iii) Gut lining (1) c. In this experiment amylase would be added to the visking tubing. i) In the control experiment what would amylase be replaced with? (1) ii) What is the function of a control experiment? (1) d. Using your knowledge of enzymes and the digestive system answer the following: i) Predict what substance would be present after 30 minutes in the distilled water. (1) ii) Explain your answer (2) iii) How would you test for the presence of this substance? (2) Holy Cross High School Page 9
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