KULLEĠĠ SAN BENEDITTU Boys Secondary, Kirkop

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1 KULLEĠĠ SAN BENEDITTU Boys Secondary, Kirkop Mark HALF-YEARLY EXAMINATION 2011/12 Track 3 (JL) FORM 3 Biology TIME: 1h 30min Question Section A Section B Global Mark Max. Mark Mark 85% Theory Paper 15% Practical 100% Final Score DO NOT WRITE ABOVE THIS LINE Name: Class: Instructions: Answer ALL questions in Section A Answer question 1 and choose ANY TWO other questions in Section B. Section A Answer ALL questions in this section. This section carries 55 marks. 1) The following question is about characteristics of living things (vital functions). Match a number in column A with a letter in column B. The first one has been done for you. Total 6marks Kulleġġ San Benedittu BS Kirkop Page 1 of 8

2 2) The diagram below shows a typical animal and plant cell. a) Name the parts of the cells labelled A, B and C A B C (3) b) Name three structures that are only found in plant cell and write their function. 1 (2) 2 (2) 3 (2) c) For each of the following types of cell, state one way in which it is different from the animal cell above. State the function of each type of cell. i) Muscle cell difference (1) function (1) ii) Red blood cell difference (1) function (1) d) Materials can enter the cells shown in the cells above by diffusion and osmosis. i) Define diffusion. (2) ii) Describe how osmosis differs from diffusion. (2) Total 17marks Kulleġġ San Benedittu BS Kirkop Page 2 of 8

3 3) Consider the following 2 cubes: Cube A and Cube B. a) Work out the surface area to volume ratio of cube A. b) Work out the surface area to volume ratio of cube B. Surface area : Volume ratio = (2) Surface area : Volume ratio = (2) c) Which cube has the larger surface area to volume ratio? (1) d) Keeping in mind the answers to the above questions, which organism has the larger surface area to volume ratio: a cat or an cow? (1) e) On a cold day, which organism would become colder first: a cat or an cow? Why? because (2) Total 8marks Kulleġġ San Benedittu BS Kirkop Page 3 of 8

4 4) The following diagram shows three plant cells which have been placed in different solutions. a) Write the letter of the plant cell that: has been placed in distilled water has been placed in a concentrated salt solution has been placed in a solution with the same concentration as the cell contents is turgid is plasmolysed (5) b) What would happen to a plant if many of its cells are plasmolysed? (1) c) Explain why plant cells do not burst when placed in distilled water. (1) Total 7marks Kulleġġ San Benedittu BS Kirkop Page 4 of 8

5 5) The diagram below shows the structure of a common mould. Study the diagram and then answer the following questions. a) Give the scientific name of the mould. (1) b) To which Kingdom do moulds belong? (1) c) Name another organism found in the same kingdom (1) d) What conditions do moulds need to grow well? (3) e) Name the three parts labelled A, B and C. A: B: C: (3) Total 9marks 6) This question is about plant classification. a) Complete the table by writing the correct name of the plant phylum next to its description. Main characteristics Large plants with seed-bearing cones. Usually have needle shaped leaves. Have proper root and stems. Reproductive spores are formed on the underside of fronds. Simple plants which do not have roots, stems or leaves. Live mainly in water. Have simple leaves called a thallus. Form reproductive spores in a capsule. Produce seed-bearing flowers for reproduction. Seeds are protected inside fruits. Phylum (5) Kulleġġ San Benedittu BS Kirkop Page 5 of 8

6 b) Look at these two types of root systems. i) Which one belongs to a dicotyledonous plant: (A) or (B)? (1) ii) Give two other differences between dicotyledonous and monocotyledonous plants. 1 (1) 2 (1) Total 8marks Section B Answer question 1 in this section and any TWO others. Answer the questions of this section on a foolscap. This section carries 45 marks. 1) Use the following key to identify the organisms shown in the diagram: a) A B C D E F H (7) Kulleġġ San Benedittu BS Kirkop Page 6 of 8

7 b) To which class of animals does animal F belong? (1) c) Name three features, which are characteristic of these organisms. (3) d) All the animals shown in the diagram belong to the same phylum. Give the name of the phylum. (1) e) The diagram below shows the stages of development of these organisms. i) What is the term used to describe this mode of development? (1) ii) Briefly explain the meaning of the term MOULTING with reference to the above process (1) f) Name one way in which this group of animals can be useful. (1) 2) This question is about animals. a) Birds such as pigeons have their body covered with feathers. What is the body covering of each of the following organisms: i) Lizard ii) Mouse iii) Fish (3) b) Write ONE structural characteristics that is common to all four organisms (pigeon, lizard, mouse and frog) mentioned in a. (1) c) The pigeon and the mouse are both endotherms while the lizard and the frog are ectotherms. Distinguish between the terms endotherms and ectotherms. (2) d) The feathers of a pigeon are covered in oil. Suggest ONE advantage of this. (2) e) Explain how feathers insulate birds. (2) f) Birds have wings to fly. What brings about movement in each of the following organisms: i) a bacterium (1) ii) a named Protist (2) g) List TWO structural characteristics that make sharks efficient swimmers. (2) 3) The Painted Frog called Discoglossus pictus is well adapted to live in the Maltese environment. a) Name the class to which the frog belongs and write TWO other organisms you would find the class you mention. (3) b) Write i) the species name ii) the genus name for the painted frog. (2) c) Frogs are ectothermic while mammals are endothermic. Distinguish between the terms ectothermic and endothermic. (2) d) Explain why frogs have webbed hind legs that are much longer than the forelegs.(2) e) In a frog water evaporates readily from the thin moist skin. Suggest ONE adaptation of the frog to overcome this problem. (2) f) Give ONE external structural difference between tadpoles and adult frogs. (2) g) Name the gas exchange organ in tadpoles and that in adult frogs. (2) Kulleġġ San Benedittu BS Kirkop Page 7 of 8

8 4) This question is about protozoans. a) Draw a diagram to show the structure of amoeba. Label the nucleus, cell membrane, pseudopodia and cytoplasm. (4) b) How does Amoeba reproduce? Is this an asexual or sexual type of reproduction?(2) c) Explain the importance of a contractile vacuole in fresh water protists. (4) d) A student observed that when Amoeba is in dilute sea water, its contractile vacuole contracts at a slower rate than when it is in fresh water. Give a simple explanation for this observation. (3) e) Amoeba has no specialised breathing organs. State how exchange of gases takes place in this organism. (2) 5) This question is about bacteria. a) Draw a well-labelled diagram of a bacterium (4) b) Give 2 ways in which bacterial cells differ from animal cells. (2) c) Some bacteria obtain their food saprotrophically. What does this mean? (2) d) Why are saprophytes important in nature? (1) e) Name and explain another type of nutrition performed by some bacteria. (2) f) Name a beneficial (economic) use of bacteria. (1) g) Name one disease caused by bacteria. (1) h) Give 2 reasons why bacteria spread in all habitats. (2) Kulleġġ San Benedittu BS Kirkop Page 8 of 8

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