ACSI 2019 Y1IP Life Science FYE

1 FINAL EXAMINATION 2019 YEAR ONE IP/ SBGE INSTRUCTIONS TO STUDENTS Write your index number in the space at the top of the Question paper. Section A Answer ALL questions on the Optical Answer Sheet (OAS) using a soft pencil. Section B Answer ALL questions in the spaces provided on the Question paper. Section C Answer ALL questions in the spaces provided on the Question paper. At the end of the examination, submit the Optical Answer Sheet (OAS) and the Question paper separately. INFORMATION FOR STUDENTS The intended number of marks is given in brackets [ ] at the end of each question or part question. This paper consists of 20 printed pages, including this cover page. LIFE SCIENCES Wednesday 2 OCTOBER 2019 1 hour 30 minutes Section Marks A / 30 B / 30 C / 20 Total / 80 Name of Parent / Guardian: Signature & Date: Index Number: Anglo - Chinese School (Independent)

2 Section A: Multiple Choice Questions (30 marks) Select the most appropriate answer for each question below and shade the corresponding letter in the Optical Answer Sheet provided. 1. Which structure in a cell is responsible for the release of energy? A. Cell membrane B. Cellulose cell wall C. Mitochondrion D. Starch grain 2. The diagram below shows onion epidermal cells seen under the compound light microscope. Identify structure labelled Z which gives structural support to the cell. Image taken from: https://www.cbsesamplepapers.info/cbse/ A. Cell membrane B. Cell wall C. Cytoplasm D. Protoplasm 3. Which of the following statements about mitochondria and chloroplasts is false? A. Both organelles are oblong. B. Mitochondria are found in both plant and animal cells. C. Mitochondria are smaller in size compared to chloroplasts. D. Only chloroplasts have a double membrane. Z

3 4. A student was viewing a prepared slide on human cheek cells, using the X4 objective lens of the compound light microscope. What is the correct steps to take, if he wants to view the cells under the next higher magnification? I Adjust the coarse adjustment knob II Adjust the fine adjustment knob III Lower the stage IV Move the nose piece and click the X10 objective lens in place A. IV → I B. IV → II C. III → IV → I D. II → IV → III → I 5. What is the energy conversion that occurs in chloroplasts during photosynthesis? A. ATP (energy used by the cell) → Chemical energy B. Chemical energy → ATP (energy used by the cell) C. Chemical energy → Light energy D. Light energy → Chemical energy 6. Which of the following shows examples of tissues in organisms? A. blood and connective B. epidermal and leaf C. epithelial and skin D. vascular and shoot 7. What is/ are produced when the muscle undergoes anaerobic respiration? A. Carbon dioxide and lactic acid B. Carbon dioxide and water C. Glucose and water D. Lactic acid

4 For questions 8 and 9, refer to the following experiment on photosynthesis of plants. In order to investigate how light intensity affects the rate of photosynthesis, a student prepares 5 set-ups, uses hydrilla leaves placed in water with a fixed amount of hydrogen carbonate added, and shines a lamp on the set-up at varying distances. The student then measures the volume of oxygen gas produced. The student completed 3 replicates for this investigation. 8. What is the independent variable? A. Distance that lamp is away from the set-up B. Mass of hydrilla leaves C. Number of set-ups the student prepared D. Rate of photosynthesis 9. Which of the following is not an important control variable? A. Mass of hydrilla leaves B. Number of replicates the student completed C. Test tube used to collect the oxygen gas D. Voltage of the lamp 10. Which of the following about photosynthesis is false? A. Carbon dioxide and water are reactants in the process. B. Chlorophyll is needed for photosynthesis to occur. C. Oxygen and glucose are products of the process. D. Starch is needed for photosynthesis to occur. 11. In Linnaeus’s system of classification, arrange the following from the least inclusive to the most inclusive. A. Kingdom, Phylum, Class, Order, Family, Genus, Species B. Kingdom, Phylum, Order, Class, Family, Genus, Species C. Species, Family, Class, Genus, Order, Phylum, Kingdom D. Species, Genus, Family, Order, Class, Phylum, Kingdom

5 12. Rhizobium bacteria have a symbiotic relationship with leguminous plants. In Linnaeus’s system of classification, what does the word Rhizobium refer to? A. Class B. Family C. Genus D. Species 13. Which of the following examples of vertebrates and invertebrates is correct? VERTEBRATES INVERTEBRATES A. crab seahorse B. frog jellyfish C. prawn ant D sea urchin stingray 14. Which of the following about the features of two classes of animals is correct? AMPHIBIA REPTILIA A. Body covering wet scales dry scales B. Body temperature regulation cold-blooded cold-blooded C. Reproduction lays eggs gives birth to live young D Respiratory organ lungs gills 15. In a neighbourhood park, organisms of different species interact and form a stable ecosystem. What is the ecological term used to describe such an interaction? A. Community B. Habitat C. Population D. Species 16. In an ecosystem, there are both abiotic and biotic factors. Which of the following is not an abiotic factor? A. Air B. pH C. Prey D. Salinity

6 17. Nematodes can be found in soil. Which of the following does not describe nematodes? A. They are in trophic level 1 of soil food web B. They can consume other smaller nematodes. C. They cause economically significant damages to crops. D. They play a role in nutrient cycling. 18. Mycorrhizal fungi exist in a symbiotic relationship with the roots of some plants. In this relationship, the fungi help the plant to absorb more mineral salts and water from the soil and in turn, the plant supplies it with food. What type of relationship is this? A. Ammensalism B. Commensalism C. Mutualism D. Parasitism For questions 19 and 20, refer to the following food web. 19. Which one of the following organisms is both a tertiary and quaternary consumer? A. Aphid B. Badger C. Owl D. Small bird

7 20. Which of the following about trophic levels is correct? A. Primary consumers are in trophic level 2. B. Producers are in trophic level 0. C. Secondary consumers can only be in trophic level 1. D. There are altogether 5 trophic levels. For questions 21 and 22, refer to the following diagram which shows how energy from food is used by a cow in a food chain. Grass Cow Cheetah 21. How many units of energy is passed on to the cheetah? A. 8 B. 9 C. 26 D. 100 22. Predict the units of energy that was made by the grass. A. 100 B. 250 C. 500 D. 1000

8 23. Which of the following statements about viruses is false? A. They are prokaryotic organisms. B. They exhibit living characteristic only when they are inside a living host. C. Their genetic material is either DNA or RNA. D. They have a protein coat that encases their genetic material. 24. Which of the following disease/ condition is not caused by a virus? A. Hand Foot and Mouth Disease B. Influenza C. Malaria D. Mumps 25. How does the exchange of genetic materials take place in bacteria? A. Binary fission B. Budding C. Conjuga