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BIOLOGY SCIENCE Paper 3 (Tow hours) Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the Question Paper. The time given at the head of this Paper is the time allowed for writing the answers. Attempt all questions from Section I and any four questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION I (40 Marks) Attempt all questions from this Section Question 1 (a) Name the following: (i) The stage when chromosomes arrange at the equator. (ii) Shrinking of protoplasm when a cell is kept in a hypertonic solution. (iii) The minute blood vessels that join arteries and veins. (iv) The type of gene, which in the presence of a contrasting allele is not expressed. (v) The excretory product formed by liver. (b) State whether the following statements are true or false. If false, rewrite the correct form of the statement by changing the first word or last word only: (i) (ii) (iii) (iv) (v) [5] Meiosis is the type of cell division occurring in the cells of injured parts of the body. Chromosomes other than the pair of sex chromosomes are called alleles. Pulmonary vein carries oxygenated blood. Raisins swell up when placed in a medium which is the hypertonic solution. Urea is formed in the kidney. (c) Choose the correct alternative from the choices given below each statement so as to complete its meaning: (i) G1, S and G2 are phases present in a) Prophase b) Interphase c) Metaphase d) Telophase (ii) [5] A plant cell may burst when: a) Turgor pressure equalise wall pressure 1 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1 [5] b) c) d) Turgor pressure exceeds wall pressure Wall pressure exceed turgor pressure None of these (iii) Formation of ATP from ADP is termed as a) Photophosphorylation b) Photolysis c) Phosphorylation d) Photosynthesis (iv) Proximal convoluted tubule of nephrons lies in a) Medulla b) Ureter c) Cortex d) Urinary bladder (v) The opening of right auricle into right ventricle is guarded by a) Tricuspid valve b) Aortic semi lunar valve c) Bicuspid valve d) Pulmonary semi lunar valve (d) Give technical terms for the following: [5] (i) The stage where chromosomes lie on the equator of the achromatic spindle. (ii) Alternative form of a gene on a pair of homologous chromosome. (iii) The Condition when the cell is placed in a hypotonic solution. (iv) The process of conversion of ADP to ATP during the first phase of photosynthesis. (v) The process by which the liquid part of the blood, filters out of the glomerulus into the Bowman s capsule. (e) Sate the function of the following: (i) Semi lunar valves (ii) Distal convoluted tubule (iii) Thylakoid (iv) Hydathodes (v) Lymph [5] (f) Given below are six sets with four terms each. In each set one term is odd and cannot be grouped in the same category to which the other three belong. Identify the odd one in each set and name the category to which the remaining three belong. The first one has been done as an example. [5] Example: Calyx, Corolla, Stamens, Midrib Odd term: midrib Category: Parts of a flower. SET ODD TERM (i) Stoma, stroma, lamellae, quantosom (ii) Basophil, neutrophil, Eosinophil, lymphocyte. 2 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1 CATEGORY (iii) Urethra, Uterus, Urinary bladder, Ureter. (iv) Transpiration, Photosynthesis, Phagocytosis, Guttation. (v) G1 phase, S phase, G2 phase, Prophase (i) Explain the following terms: (i) Photolysis (ii) Karyokinesis (iii) Mutation (iv) Guttation (v) Diapedesis [5] (ii) Given below are five sets of terms. In each case, arrange and rewrite each set so as to be in logical sequence. (i) Vena cava, Tricuspid valve , right ventricle, right atrium, pulmonary artery (ii) Efferent arteriole, afferent arteriole, glomerulus, collecting tubule, Henle s loop (iii) Starch, Glucose, Oxygen, Light and water, CO2 (iv) Xylem, endodermis, cortex, root hair, Passage cells (v) Karyokinesis, S-Phase, Cytokinesis, G-1 phase, G-2 Phase. [5] SECTION II (40 Marks) Attempt any four questions from this Section Question 2 (a) The diagram given below represents a stage during mitotic cell division in an animal cell [5] (i) Identify the stage. Give a reason to support your answer. (ii) Name the parts labelled 1, 2 and 3.What is the chromosome number of the cell? (iii)Draw a neat, labelled diagram of the cell as it would appear in the next stage. Name the stage. (b) Give reasons for the following: (i) Plants begin to die when excess of soluble fertilizers are added to the soil. (ii) It is advisable not to sleep under a tree at night. 3 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1 [5] (iii) (iv) (v) Gametes have a haploid number of chromosomes. Pickles do not get spoiled if they contain large amount of salt. Why is it better to transplant a seeding in the evening and not in the morning? Question 3 a. Following are the diagrams of a certain structure in plants in two conditions. (i) (ii) (iii) (iv) [5] Name the structure shown. Name the parts numbered 1 5. What are the most apparent difference between A and B in the structure shown? Describe the mechanism which brings about the change in the structure depicted in A and B. b. Given is an experimental set up to demonstrate a particular process. Study the same and answer the question that follow: [5] (i) (ii) (iii) (iv) (v) Name the physiological process being studied. Explain the process mentioned above. What is the aim of the above experiment? What would you observe in the experimental set-up after an hour? Give a reason to support your answer. Mention any three adaptations found in plants to overcome the physiological process mentioned in (i) above. 4 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1 Question 4 a. The given diagram represents an experimental set-up to demonstrate a vital process. Study the same and then answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) b. What would you observe in the experimental set-up after an hour or so? What control experiment can be set-up for the above experiment? Keeping in mind the root hair cell and its surrounding, name the part that corresponds to a. Concentrated sugar solution b. Parchment paper c. Water in the beaker Name any other substance that can be used instead of parchment paper in the above experiment. Mention two advantages of this process to the plant. A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours. [5] (i) (ii) (iii) (iv) (iv) What aspect of photosynthesis was being tested? Why was the plant placed in the dark before beginning the experiment? During the starch test why was the leaf (1) boiled in water (2) boiled in methylated spirit. Write a balanced chemical equation to represent the process of photosynthesis. Draw a neat diagram of a chloroplast and label its parts. 5 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1 Question 5 a. (i) State Mendel s law of Independent Assortment. (ii) A homozygous Tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous Dwarf plant (t) bearing white flowers (r):(1) Give the Genotype and Phenotype of the F1 generation. (2) Give the possible combinations of the gametes that can be obtained from the F1 hybrid. (3) Give the dihybrid ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation above are crossed. b. The given diagram represents a mammalian kidney, tubule, nephron and its blood supply parts indicated by the label: Study the diagram and answer the following questions in each case; (i) (ii) (iii) (iv) (v) Where does ultra-filtration takes place? Which structure contains the lowest concentration of urea? Which structure contains the lowest concentration of glucose? Where is the most water reabsorbed? Which parts are present in the cortex? Question 6 a. Differentiate between the following pairs on the basis of what is given in brackets: (i) Lymphocytes and Neutrophils. (structure of the nucleus) (ii) Beginning of the ventricular systole and the end of ventricular systole. (type of heart sound) (iii) Respiration and photosynthesis ( Gas released) (iv) Cobalt chloride paper and Goat s bladder (Process where it is used) (v) Guttation and bleeding in plants. (cause) b. Give reason (i) Excretion is a necessary process. (ii) The wall of ventricles is thicker than auricles. (iii) Rate of transpiration will be more on a windy day rather than on a calm day. (iv) The raisin swells up when kept in sugar solution. (v) Colour blindness is more common in men than women. 6 ICSE (Grade : X) | BIOLOGY (SCIENCE Paper-3) | Pre Board Exam-1
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