ST. FRANCIS SECONDARY SCHOOL

Transcription

1 ST. FRANCIS SECONDARY SCHOOL Science Form 2 Half Yearly Exam SPECIMEN PAPER Name: Class: TIME: 1 hour 30 minutes Read ALL the questions CAREFULLY and then answer ALL the questions. Check all your answers as soon as you finish. Do not scribble unnecessarily on the exam paper as marks will be deducted. Fill in your name and class in both spaces GOOD LUCK! Name Class Question 1 Separation Techniques 2 Breathing 3 Yeast 4 Elements 5 Digestion 6 Plant diseases 7 Buskett fieldwork 8 Elements and Compounds Total /100 Mark Remark: Page 1 of 19

2 Page 2 of 19

3 This question is about separation techniques 1. Jerome has a mixture of salt and sand. He adds some water and stirs the mixture. a. Complete the sentences below to show what would happen to the salt and sand mixture after Jerome stirs in water. (5 marks) The salt will. We say that the salt is in water to form a. The sand will. We say that the sand is in water. b. Jerome uses this equipment to separate the sand from the salt and water mixture. Describe how the sand is separated by completing the following sentences. Page 3 of 19

4 The water (1). The salt (1). The sand (1). c. Tick one box to show which process Jerome could use to get the salt back from the salt and water mixture (1 marks). d. Jerome has now been given a different task. His teacher has mixed together 3 pieces of solid metals in the school laboratory. The metals included pieces of 1 piece of iron, 1 piece of nickel and 1 piece of gold. All metal pieces have been painted black. The teacher has asked Jerome to device a manner with which he can retrieve the gold piece. Write a simple method with which Jerome can decide which of the 3 pieces of metal is the gold piece (2 marks) Page 4 of 19

5 TOTAL 11 marks This question is about breathing and respiration 2. Nancy is a ballerina dancer. The graph below shows how the volume of air in her lungs changes as she dances. a. From the graph, give two ways how her breathing changes when she dances. (2 marks) Page 5 of 19

6 b. As Nancy dances, her body uses oxygen and produces Carbon dioxide. What is this process called? (1 mark) c. Which of the following sequence of events shows how the carbon dioxide is removed from Nancy s body? Tick the correct box. (2 marks) d. Nancy also suffers from asthma attacks especially during spring. Explain how this affects her breathing during dancing. (2 marks) Page 6 of 19

7 e. Name one other factor which effects breathing rate and state how the breathing rate is affected. (3 marks) Total- 10 marks This question is about microbes 3. Sarah investigated making bread. She described what she did below. Page 7 of 19

8 Sarah repeated the experiment with water at different temperatures. Her results are shown below. a. Use the table of results to answer the following questions: i. What, do you think, is Sarah trying to find out in this experiment (aim of experiment)? (2 marks) ii. Which is the best temperature to make bread dough rise? (1 marks) Page 8 of 19

9 At each temperature Sarah used dough from the same mixture. Give one other way in which Sarah made her experiment fair. (1 mark) b. Sarah made a prediction the volume of the dough increases because of the yeast. What could she do to test her prediction? (1 marks) c. Yeast is a microbe. Name: i. two other microbes. (2 marks) ii. three other processes, other than breadmaking that make good use of microbes. (3 marks) e. Mention one beneficial/good type of microbe found inside the human body and show its importance in the human body (2 marks) Page 9 of 19

10 TOTAL- 12 marks This question is about elements 4. A student researched the element flourine (F) and found the following information. a. Which particular source could the student have used to find this information? (1 mark) b. Flourine is a yellow gas and does not conduct electricity. Do you expect fluorine to be a metal or a non-metal? (1 mark) c. Mention 2 properties of metals (2 marks) Page 10 of 19

11 d. Underline the correct answer. (7 marks) Fluorine reacts with the element sodium, to form the (compound, mixture) sodium fluoride. This is a (physical, chemical) change. Sodium fluoride (melts, dissolves) in water to form a sodium fluoride (suspension, solution). This is a (physical, chemical) change as it forms a mixture of two (elements, compounds) and can be easily (heated, reversed). e. Fill in the table below with 3 elements that you have learnt about. Write the name of the element, its symbol and whether the element is a metal or a non metal (9 marks) Element Name Symbol Metal/Non metal TOTAL 20 marks Page 11 of 19

12 This question is about the digestive system 5. The diagram shows the human digestive system. a. To which organ of the digestive system does the oesophagus (gullet) carry food? (1 mark) b. Which main nutrient is broken down in this organ? (1 mark) c. On the diagram mark the position where absorption of the digested food takes place with a letter X. (1 mark) d. State one function of the large intestine. (1 mark) Page 12 of 19

13 e. Name a part of the digestive system where food is broken down mechanically into small pieces and is also broken down chemically by means of enzymes. (1 mark) f. We need food for different reasons. Match column A to column B and write your answer in the space provided. (3 marks) Column A Answer Column B a b c Food gives you energy Food gives you substances Food gives you the building blocks that the body needs to keep healthy for growth and repair for movement and to keep warm g. A school poster shows a glass of milk with a slogan which read: Young teens need calcium so pour it on i. Why does the poster say young teens need calcium? (1) Page 13 of 19

14 ii. State one OTHER calcium-rich food (1) Total -11 marks This question is about microbes 6. The newspaper article shown below explains how a pandemic disease could affect the olive tree populations in Malta. Page 14 of 19

15 a. What is the name of the microbe causing the disease? Use both English and scientific names. (2) English name : Scientific name : b. What type of microbe is this? (1) c. On the newspaper it was written that although not all microbes are pathogens, this microbe can also be referred to as a pathogen. Explain this statement. (2) d. How is the microbe transmitted from one tree to the other? (1) e. What is the visible effect of the microbe on the olive trees? (1) f. What finally kills the olive trees? (1) Page 15 of 19

16 g. Suggest TWO possible ways of controlling transmission of this disease. (2) h. Suggest one other disease that is caused by the same type of microbe mentioned in the article (1) TOTAL -11 marks This question is about organisms living in a natural habitat 7. Read the following paragraph and answer the questions. Chloe and Sandra went on a school outing to Buskett. The field visit was an important part of their Form 2 syllabus. The teacher instructed all the class to regard certain rules when on the visit. Students were instructed to listen to the environment around them and not make too much noise. The teacher also said that respect should be shown to all organisms encountered and the guide s instructions should be followed at all times. Students were advised to report any strange organisms to their guide and to keep together to avoid dangerous tracks. At the end of the school visit all the class were given a worksheet to fill in. Help Chloe and Sandra to fill in their worksheet by using knowledge you gained from the field visit done with your class. Page 16 of 19

17 a. What is a natural habitat? (2 marks) b. Mention 3 organisms you encountered during your field trip. Indicate whether the organism is an animal or a plant and also indicate where the organism was sighted. (9 marks) Organism Animal/Plant Place/Habitat where it was seen c. Why is it important to keep noises to a minimum while walking in a protected place in the country side (1 mark) d. Mention one site in Malta where animals such as birds are protected (1 mark) Page 17 of 19

18 e. Why do you think such sites are important? (2 marks) f. Match the term on the right to the definition on the left by writing the letter in the middle. (3) Term used Definition A overgrazing Feeds on any other animal B Traces Protecting natural resources C Garrigue (garigue) The excessive feeding by sheep of grass D Predator Weed-killers E Herbicide A rocky area with very little plants F Conservation Marks left behind by animals like faeces or bite marks g. Why is Buskett called a semi-natural woodland? (1) Total- 19 marks Page 18 of 19

19 This question is about elements and compounds. 8. Match the statements on the left to the ones on the right by putting the matching letter in the shaded column. (6) A Elements Noble gases B A block of elements between group 2 and group 3 Found on the left side of the periodic table C Very unreactive A gaseous element and a non-metal D Chlorine Represented by different symbols E Metals Transition metals F Carbon dioxide A gaseous compound Total- 6 marks -END OF PAPER- Page 19 of 19