Grade 09 Angel International School - Manipay 2 nd Term Examination April, 2017 Biology Duration: 2.30 Hours Part 1 Index No:- 1) Choose the correct answer and underline it 1) The diagram shows a high-power drawing of a bacterium. Which three components are found in both this bacterium and an animal cell? a) capsule, cell membrane and cell wall c) cell membrane, cell wall and DNA b) capsule, DNA and ribosome d) cell membrane, DNA and ribosome 2) The diagram shows a stage micrometer scale on which the small divisions are 0.1 mm. It is viewed through an eyepiece containing a graticule. The stage micrometer scale is replaced by a slide of a plant cell. What is the width of a chloroplast? a) 0.5 mm b) 10 μm c) 50 μm d) 100 μm 3) Which structures are found in typical eukaryotic cells? 1. 70S ribosome 2. 80S ribosome 3. linear DNA (chromosomes) 4. circular DNA a) 1, 2, 3 and 4 b) 1, 2 and 3 only c) 1 and 4 only d) None of the above 1
4) What is the function of the nucleus? a) The formation and breakdown of the nuclear envelope. b) The formation of rough endoplasmic reticulum. c) The synthesis of ribosomal proteins. d) The synthesis of rrna. 5) The electron micrograph shows a cell. What is the actual diameter of the nucleus? a) 0.6 μm b) 6 μm c) 35 μm d) 350 μm 6) A student carried out four tests for biological molecules on a solution. The observations are shown in the table. Which molecules may be present in this solution? a) glucose, starch, protein b) lipid, protein, glucose c) protein, starch, sucrose d) starch, protein, lipid 7) Which statements about the effect of all enzyme inhibitors are correct? 1. change the shape of the active site 2. denature the enzyme 3. reduce the rate of the enzyme-catalyzed reaction a) 1, 2 and 3 b) 1 and 2 only c) 1 and 3 only d) 3 only 8) The 'lock and key' model has been used to explain enzyme action. This model describes how enzymes act as catalysts. Identify which of the following statements is not supported by the 'lock and key' model. a) Enzymes attach only to very specific molecules b) Enzymes allow the gradual and controlled release of energy c) Enzymes speed up chemical reactions d) Enzymes are slowly used up during this reaction 9) Which process can take place in a root hair cell when oxygen not available? a) Active transport only b) Diffusion only c) Active transport and osmosis only 2
d) Diffusion and osmosis only 10) The graph shows the effect of temperature on a chemical reaction which is controlled by enzymes. Identify the correct statement. a) most product molecules are being released at point of A b) enzyme of pepsin is more active in point of C c) all enzymes are denatured in point of B d) plants have optimum temperature nearest point of B 11) Analyse this diagram and identify the correct statement about them. a) Cell may or may not have a cell wall and chloroplasts b) They are unicellular c) Chlamydomonas cannot move towards the light d) Feed by saprophytic nutrition 12) Yeast reproduces by budding. Explain how budding is different from binary fission. a) With budding, the parent cell is still identifiable because scars are left after the bud breaks away. b) No nuclear material is transferred across in budding. c) Budding is a faster process than binary fission d) The bud does not break off the parent cell. 13) Lack of vitamins and minerals in your diet can result in deficiency diseases. Identify the disease that is a result of a lack of vitamin C a) rickets b) pellagra c) scurvy d) kwashiorkor 3
14) Analyse this diagram and identify the wrong statement about them. a) They have no nucleus b) They have cell wall made of cellulose c) They have flagellum d) Some of them are can carry out photosynthesis 15) Identify which of the following cannot be viewed using a light microscope. a) Bacteria c) Protozoa b) Virus d) Fungi 16) The diagram shows the lock and key model of enzyme action. Which is the enzyme and which is the substrate? 17) In higher plants, the gaseous exchange takes place through a) Stomata b) Lenticels c) general surface of some cells d) all the above 18) The diagram shows an experiment whose purpose is a) to show that water enters a plant through its roots. b) to show that a plant makes its own food through photosynthesis. c) to show the path of water through a plant. d) to show that water evaporates from a leaf by transpiration. 4
19) Name the parts X and Y in the leaf shown. a) X = mid-rib, Y = leaf blade b) X = mid-rib, Y = stalk c) X = vein, Y = stalk d) X = vein, Y = leaf blade 20) Select the incorrect statement from the following: a) Phloem is made of living cells. b) Xylem transports food from the roots to the leaves. c) Phloem carries food from the leaves to the rest of the plant. d) Xylem carries water and minerals upwards from the roots. 21) The diagram shows two food tests carried out on solution X Which nutrients are present in solution X? a) protein and starch b) protein and sugar c) starch and fat d) starch and sugar. 22) Stomata control the movement of substances both into and out of the plant. Recall which of the following does pass through the stomata. a) Gases, water, minerals b) Glucose,air, vapour c) Glucose, carbon dioxide, water d) Oxygen,carbon dioxide, vapour 23) Which metallic element is present in haemoglobin? a) Magnesium b) Sodium c) Iron d) Calcium 24) What is a characteristic of all catalysts? a) They are broken down in the reaction. b) They are made of protein. c) They are not changed by the reaction. d) They do not change the rate of the reaction. 5
25) The table shows the temperature and ph at which four different enzymes are most active. Which enzyme is a protease from the stomach? 26) Name the enzyme which is present in both animal and plant cells. a) Catalysts c) Polymerase b) Catalase d) None of the above 27) This diagram shows a cross-section of a leaf. Identify the label that corresponds to the xylem cells. 28) Which is due to the lack of potassium ions in plant leaves? a) All leaves very dark green b) Grow abnormally c) Wilting of the leave d) Young leaves become long and thin 29) This graph shows the effect of light intensity on the rate of photosynthesis. Identify which of these statements can be determined from the graph. a) Temperature has an effect on the rate of photosynthesis b) After a certain light intensity point there is no further increase in the rate of photosynthesis c) The greater the light intensity, the greater the rate of photosynthesis d) Light intensity depends on the rate of photosynthesis 6
30) Analyse this diagram and find why the leaf wilted? a) Leaf cell could not get enough carbon dioxide to produce food b) Leaf cells lose water by limiting factors through the stoma c) Leaf cell could not get enough water because stoma closed d) Leaf cell could not get enough oxygen because stoma closed 31) This diagram shows the process of how a leaf carries out photosynthesis. What are the raw materials needed for photosynthesis? a) Chlorophyll, light b) Water, carbon dioxide c) Chlorophyll, light, Water, carbon dioxide d) All of the above 32) The diagram shows a student s drawing of guard cells. Which label line is incorrect? 7
33) Which kind of cell makes the cuticle on a leaf? a) Epidermis b) Palisade c) Mesophyll d) phloem 34) Which is the correct order does a molecule of water, transported from the stem pass through these regions in to the leaf? a) Xylem vessel spongy mesophyll cell air space stomata b) Spongy mesophyll cell air space xylem vessel stomata c) Stomata air space spongy mesophyll cell xylem vessel d) None of the above 35) A granium plant has leaves that are in the centre but white around the edges. The plant is destarched and then has one of its leavws partly covered with black paper on both sides of the leaf, as shown. The plant is placed in bright light for 48 hours. The leaf is then tested for starch. which diagram correcly shows the areas that contain starch? 36) which signs show that a plant has been grown in a culture solution deficient in Magnesium? a) Purple leaves and poor root growth b) Small leaves and thin stem c) White upper leaves and normal lower leaves d) Yellow stem and yellow leaves 37) The diagram shows an experiment whose purpose is Aluminium foil bag a) To show that water enters a plant through its roots. b) To show that a plant makes its own food through photosynthesis. c) To show the path of water through a plant. d) To show effect of light on a de-starched plant 38) The diagram shows a spongy mesophyll cell.which structures indicate that this is a plant cell? a) P and S b) Q and R c) R and P d) S and Q 8
39) The bar chart shows the average number of chloroplasts in each of three different types of leaf cell. What are the three types of cell? 40) Which statements are wrong about lysozyme? a) It is a model of an enzyme b) It is found in saliva and tears c) It is an organelle d) None of the above (40 Marks) Part 2 1. Draw lines connecting the minerals with their deficiency symptoms Nitrates Phosphate Potassium poor root with their deficiency symptoms yellow leaves with dead spots stunted growth and yellow older leaves (1X3=3) 2. Complete the chart by using the knowledge of adaptations of leaves for photosynthesis Adaptation Function No chloroplasts in epidermal cells Palisade cells arranged end on Large surface area Phloem tubes within short distance of every mesophyll cell thin Stomata in lower epidermis Air spaces in spongy mesophyll (1X7=7) 9
3. Fig. 3.1 is a diagram of the water cycle. Water is a large component of the cells in the leaves of trees, as labelled D on Fig. 3.1. a) Explain how water passes from a leaf cell to the atmosphere. (3) b) Explain how the loss of water from the leaves helps to move water from the roots to the leaves. (3) c) Explain how water enters the roots of the trees from the soil. (4) (Total 10) 4. The diagram shows a section through a leaf. a) The upper layers of a leaf are transparent. Suggest an advantages to a plant of this feature (1) b) Give the letter that indicate cuticle which is made of waxy material. Suggest an advantages to a plant of this feature (2) c) Photosynthesis produces glucose. Describe how plants make use of this glucose. (4) d) Give the letters that indicate a vascular bundle and state two functions in leaves (4) 5. The diagram below shows an experiment to study photosynthesis in pondweed. A. I. During the experiment bubbles of gas are seen collecting in the test tube. Which gas is (Total 11) produced? (1) II. How can you prove what the gas bubbles are? (1) 10
III. The pondweed needs certain conditions to produce the bubbles of gas. What are these conditions? (2) IV. What substance other than the gas is produced during photosynthesis? (1) B. The leaves of the pondweed were removed, boiled in water, then in ethanol, and then washed. Iodine solution was added to the leaf. I. The leaf changed colour when iodine was added. What colour did it become? (1) II. What did this colour change show had been produced in the leaf? (1) (total 7) 6. Figure shows, in order, four stages in which an enzyme controlled chemical reaction may occur. i. Identify M, N, O and P (4) ii. By referring to figure, explain why only a small amount of enzyme is needed to catalyse a iii. reaction involving many molecules (2) a) Explain how a rise in temperature may increase the rate of an enzyme controlled reaction. (2) b) At high temperatures, enzymes are denatured and can no longer act as catalysts. By using the letters M and N from figure, suggest what happens when an enzyme is denatured. (2) (Total 10) 7. Keys are used for identification i. What do you mean by dichotomous key? (2) ii. Use a dichotomous key to classify the given plants. Grass, mango, guava, hibiscus, coconut, jasmine, duckweed (5) iii. Use a dichotomous key to classify the given animals. Snake, leech, cat, leopard, butterfly, cock, cow, rat, dinosaur, crocodile (5) (Total -12) ***** 11