BISHOP S CONSERVATORY SCHOOL HALF-YEARLY EXAMINATIONS FORM 3 BIOLOGY TIME: 1hr 30 min

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1 BISHOP S CONSERVATORY SCHOOL HALF-YEARLY EXAMINATIONS 2005 FORM 3 BIOLOGY TIME: 1hr 30 min INDEX NUMBER Total: 100 marks Section A: Answer ALL questions in this section, using the spaces provided. This section carries 55 marks. Don t spend more than 45 minutes on this section!!!! 1. Read the descriptions below and fill in the correct vital function: - (5 marks) Description One amoeba splits to form 2 individuals Small plant seedlings increase in height after a few days Cells burn food to release energy A student stands up and walks out of the room The cat is attracted to the smell of fish on the table Vital Function 2. The following diagram shows a figure of the light microscope. a) Name parts A to G: - A B C D E F G (7 marks) b) List the functions of the following parts: - (3 marks) B C E

2 3. In the table below there is a description of some of the characteristics shown by six different organisms. Give the Group name of an organism that best fits the description. The choices given can be used once, more than once or not at all. FERNS MONOCOTYLEDONS PROTISTS EUGLENA BACTERIA FUNGI DICOTYLEDONS BRYOPHYTES CONIFERS LIVERWORTS A unicellular organism that moves by using a flagellum. Its genetic material is not enclosed in a nucleus. Organisms possessing a branching body in the form of a mycelium. Have no chlorophyll. Forms seeds within cones. Does not produce flowers. A flower producing plant with narrow elongated leaves having parallel veins. Leaves have spore-making sporangia called sori on the underside of leaves. Have an underground rhizome. The leaf is generally referred to as a frond. A plant with broad leaves, branched leaf veins and a tap root. (6 marks) 4a. Find the surface area to volume ratio of the following cube of sides 4 cm. (Show your working) Surface Area = (2) Volume = (1) Surface Area to Volume ratio = (1) b. What happens to the surface area to volume ratio as an object increases in size? (You can give an example to help you explain) (1 mark) (Total 5 marks)

3 5. Use the dichotomous key below to identify plants A to F: - (6 marks) Plant A Plant B Plant C Plant D Plant E Plant F 1. The plant is in flower The plant is fruiting go to 2 Smilax aspersa 2. Floral parts are purple Floral parts are not purple go to 3 go to 4 3. Multiple flowers are present One flower is present Orchis collina Anthirrinum tortuosum 4. More than 30 petals are present per flower Less than 30 petals are present per flower Bellis annua go to 5 5. Flowers are white Flowers are yellow Urginea pancration Dittrichia viscosa. A B C D E F

4 6. The diagram below shows an insect. a. What is the phylum to which all insects belong? (1 mark) b. State three (3) features you can see in the diagram that are characteristic of insects: a. b. c. (3 marks) 7. The diagram shows a section through a green leaf. A B C D E Match each letter in the diagram to the description of its function. (5 marks) Letter Description of its function structure that absorbs light structure that controls all the cell s activities produces pressure inside cells and makes them turgid contains cells that do not carry out photosynthesis but support the leaf allows water to leave by evaporation

5 8. The diagram below shows a section through a flower: - a) Name the parts labelled A to E: (5 marks) A - B - C - D - E - b) Do you think the flower shown is insect or wind pollinated? Why? (2 marks) c) What is the function of structure C? (1 mark) 9. Arrange the following in the correct order starting with the largest group first. (3 marks) order, family, species, kingdom, phylum, genus, class 10. Answer the following questions on the diagram: a) The diagram on the left shows: o Yeast o A mushroom o Pin Mould o An alga b) Which letter shows the sporangium on the diagram? c) The type of nutrition shown by this organism is: o saprophytic o parasitic o photosynthetic (3 marks)

6 Section B: Answer Question 1 on this paper and any two (2) other questions from this section on the separate sheets provided. Each question carries 15 marks. 1. Read the following and then answer the questions that follow: - Figure 1: A Mesocyclops species Tiny crustaceans help defeat dengue fever Putting tiny crustaceans in Vietnamese water tanks and wells to eat the mosquitoes that carry dengue fever is helping to control the disease, a new study reports. Brian Kay of the Queensland Institute of Medical Research in Brisbane, Australia set up a mosquito-control programme with Vu Sinh Nam of the Ministry of Health in Hanoi, Vietnam, and may have protected over 380,000 people from the disease. The dengue virus causes high fever and muscle cramps so painful that the disease is sometimes called break-bone fever. And the severe form of the disease - dengue haemorrhagic fever - can be lethal. Since 1970, dengue haemorrhagic fever has spread from nine countries to 60, with cases occurring in Asia, the Americas, and the Pacific. The cause of the upsurge is not fully understood, but the mixing of the four different viral strains by international travellers is thought to play a key role. The rise of densely populated "shanty towns" around cities also contributes. These towns lack services, and discarded containers, or containers used to store water, become breeding grounds for the virus-carrying Aedes aegypti mosquito. A key aspect of the low-tech strategy used in Vietnam was enlisting local people to catch crustaceans - called Mesocyclops - from water tanks and wells, and transfer them to uninfested water. These feed on mosquito larvae that develop into adults in still water. "We've never visited a village that didn't have some Mesocyclops. They are only one millimetre long, but they swim with a characteristic jerky movement. The kids can pick them out very quickly," says Kay. Kay and Nam developed their programme in nine communes, or small clusters of villages, in Northern Vietnam. In 2001, local health and community leaders introduced the programme into 37 additional communes in the north, totally eliminating the mosquito in 32 of them. There have been no reported cases of the disease in any of the communes since a.i. ii. iii. Journal reference: The Lancet (vol 365, page 613) What type of organism causes dengue fever? Write the scientific name of the organism that helps spread the dengue fever: Mesocylops is a Crustacean, to which phylum does it belong? b. How do the Mesocyclops help control the spread of dengue fever? (3 marks) (1 mark) c. How many people were probably protected from dengue fever with the aid of Mesocyclops? (1 mark)

7 d. What are the symptoms of dengue fever? (2 marks) e. What is the size of Mesocylops? (1 mark) f. Can viruses be classified as living things? Give a reason for your answer (2 marks) g. Although viruses are always harmful, bacteria may be either harmful or beneficial. Give: i. an example of a disease caused by bacteria ii. an example of when bacteria can be helpful (2 marks) h. Bacteria can take various shapes and forms. Draw and write the name of the two bacterial types. (3 marks) 2a. Draw a diagram to show the structure of amoeba. Label the nucleus, cell membrane, pseudopodia and cytoplasm. (5 marks) b. List 4 characteristics which amoeba shares with all other living organisms. (2 marks) c. Name 3 differences between amoeba and a plant-like protist like Chlorella (3 marks) d. Explain the importance of a contractile vacuole in fresh water protists. (2 marks) e. A student observed that when amoeba is in dilute sea water (little salt and a lot of water), its contractile vacuole contracts at a slower rate than when it is in fresh water. Give a simple explanation for this observation. (2 marks) f. Amoeba has no specialised breathing organs. State how exchange of gases takes place in this organism. (1 mark)

8 3a. Draw and label outline structures of: (i) a virus (ii) a bacterium (iii) a typical plant cell (3, 3, 3 marks) b. Describe the differences between Prokaryotic and Eukaryotic cells. (2 marks) c. In a table list four (4) differences between Plant and Animal cells (4 marks) 4. Unicellular organisms like Amoeba and Chlorella do not need transport systems, but multicellular organisms like flowering plants cannot survive without them. a. Explain why multicellular organisms need transport systems while unicellular organisms do not. (2 marks) b. Name two transport tissues found in flowering plants. (2 marks) c. Name one substance which is carried in each transport tissue mentioned in (b) (2 marks) d. Substances can move in or out of cells by diffusion or by active transport. Give two ways in which diffusion is different from active transport. (2 marks) e. Give one example of diffusion and one example of active transport in plants (2 marks) f. Give one example of diffusion and one example of active transport in animals (2 marks) g. Describe a simple experiment to demonstrate diffusion in air. (3 marks) 5. This question is about flowering plants a. Draw a labeled diagram to show the external structure of a typical dicot leaf (3 marks) b. Give one (1) important function of the leaf. (1 mark) c. Make a table to show three (3) differences between monocotyledonous and dicotyledonous plants. (3 marks) d. Give two important functions of the plant roots (2 marks) e. Which structure increases the roots surface area? (1 mark) f. Give an important function of the flower. (1 mark) g. Draw a diagram of a trasverse section of a dicot stem labeling clearly the vascular bundles, the pith, the cambium and the epidermis. (4 marks) END OF PAPER