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LOKHANDWALA FOUNDATION SCHOOL PRELIMINARY EXAMINATION -2020-2021 SUBJECT: SCIENCE -3 (BIOLOGY) Date: 22.01.20 21 Duration: 2 Hrs. Grade: 10 Max. Marks: 80 _____________________________________________________________________________________________ General Instruction: 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 A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ].This paper consists of 5 printed sides. _____________________________________________________________________________________ SECTION A (40 marks) (Compulsory) Question 1. A. Name the following: [5] i. The substance which capture photons in plants. ii. The hormone secreted by -cells of Islets of Langerhans. iii. The process of passing out of urine from the body. iv. The point of attachment of two chromatids. v. The iron containing pigment in erythrocytes. B. Choose the correct option form the four options given below: i. Our memory weakens if this part is injured: a. Medulla b. Pons c. Cerebellum d. Cerebrum ii. Hepatic portal system connects: a. Digestive system to liver b. Kidney to liver c. Liver to digestive system d. Liver to kidney iii. On a hot summer day, plant cooling is due to a. Loss of water vapour from leaves b. Transport of water in plants c.Loss of liquid water d. Loss of water from entire plant. iv. When a cell is fully turgid, which of the following will be zero a. Osmotic pressure b. Turgor pressure c. Wall pressure d. Suction pressure v. The beating of the heart of man is heard on the left side because a. The left ventricle is towards the left side b. Both the ventricles are towards the left side c. Contraction of heart is powerful on the left side d. The dorsal aorta is on the left side. [5] C. Correct and rewrite the statements by changing the biological term that is underlined for each statement: [5] i. Raisins swell up when placed in a medium which is hypertonic solution. ii. Rods enable us to see the three primary colours. iii. Diapedesis is the process of engulfing harmful microbes by white blood cells. iv. Iodine is the essential element constituent of chlorophyll. v. Deafness is caused due to rupturing of the pinna. D. Identify the ODD term in each set and name the CATEGORY to which the remaining belong three belong: [5] i. Pleura, Pericardium, Meninges, Spinal cord. ii. Adenine, Guanine, Creatinine, Cytosine iii. ACTH, TSH, ADH, FSH. iv. Myopia, Hypermetropia, Xerophthalmia, Astigmatism. v. Stomata, Hydothodes, Phloem, Lenticel. Grade 10 Subject: Biology E. Give suitable biological reasons for the following statements: i. Photosynthesis stops above 35-degree Celsius. ii. We cannot distinguish colours in dim light. iii. Plants begin to die when excess of soluble fertilizers are added to the soil. iv. Some women have facial hair like beard and moustache. v. Loss of nucleus and mitochondria makes erythrocytes more efficient in their function. Page:2 [5] F. Match the items given in column A with the most appropriate ones in column B and REWRITE the correct matching pairs: [5] Column A Column B i. Area of finest vision a. Iodine ii. Clotting of blood b. Fluid present in median canal of cochlea iii. Cretinism c. Blind spot iv. Stroma d. Yellow spot v. Perilymph e. Site of light reaction f. Calcium g. Site of light independent reaction h. Hyposecretion of thyroxin i. Hypersecretion of thyroxin j. Fluid present around median canal of cochlea G. Given below is an example of a certain structure and its special functional activity. On similar pattern, fill in the blanks with most appropriate function. [5] e.g. Mitochondria and storage of energy. i. Thrombocytes and ____________. ii. Grana and __________________. iii. Guard cells and _______________. iv. Medulla oblongata and ___________. v. Centrosome and ________________. H. The figure given below shows the epidermal cell of an onion bulb. The cell was transferred in sugar solution. Observe the same and answer the questions which follow: [5] i. Draw a well labelled diagram of the epidermal cell as it would appear after immersion in a strong sugar solution. ii. What scientific term is used for the changes as shown in (i) above? iii. What should be done to restore the cell back to its original condition? iv. Give scientific term for the recovery of the cell back to its original condition? v. Define osmosis SECTION B (40 marks) (Attempt any four questions from tis section) Question 2. A. Differentiate between the following pairs on the basis of what is mentioned in the bracket: [5] i. Transpiration and Guttation (Structure through which it occurs) ii. Lymphocyte and Neutrophils (Structure of nucleus) iii. Cerebrum and Cerebellum (Function) iv. Pulmonary circulation and Systemic circulation (Define) v. Palisade parenchyma and Spongy parenchyma (Location) Grade 10 Subject: Biology Page: 3 B. Three plants A, B and C are placed in beakers containing coloured water. The water in each beaker is covered with a layer of oil. The leaves were removed from plant B, while plant C was exposed to strong light. [5] i. In which plant A, B or C would the water move up fastest? ii. In which plant would water move slowly? iii. Why is the water covered with oil? iv. What is being investigated by this experiment? v. Define the physiological process studied. vi. Draw a neat labelled figure of open stomata. Question 3. A. The figure given below shows a part of a nephron. Study the same and answer the questions. [5] i. In which region of the kidney is the above structure present? ii. Label the parts numbered 1, 3 and 4. iii. What is the technical part of the process which occurs in part 3. iv. Why is fluid X not called urine? Justify your answer. v. Draw a neat labelled figure of urinary system of man. B. Give scientific terms for the following: i. The force which helps in conduction of water. ii. The part of brain that carries impulses from one hemisphere of cerebellum to the other. iii. Loss of water through cut stem. iv. A neurotransmitter stored at the terminal end of axon. v. Hormone which controls water reabsorption in renal tubules. vi. An eye defect in which cornea becomes uneven. vii. Endocrinal cells present in the pancreas. viii. Hormones which stimulate other endocrine glands. ix. Cellular components of blood containing haemoglobin. x. Blood vessel which supplies blood to liver. [5] Question 4. A. Give two functions of the following: [5] i. Hypothalamus ii. Spleen iii. Vacuole in plants iv. Iris v. Plasma B. The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow: [5] i. Name the phase. ii. Label the parts 1,2 and 3. iii. Which part of the heart is contracting in the phase? Give a reason to support your answer. iv. Draw well labeled diagram of part 1 and 2 to show the structural difference between them. Grade 10 Subject: Biology Page: 4 Question 5. A. The diagram given below shows an experimental set up with 2 bell jars, bell jar A is without a potted plant and the other C with well watered potted plant. Bell jars A and C are experimental set ups and bell jars B and D show the observation of the experiment. Study the diagram and answer the following questions. [5] i. What is the aim of the experiment? ii. Why does the candle flame extinguish and the rat die in Bell jar B? iii. Why does the mouse survive in bell jar D? iv. Give a balanced equation for this physiological process taking place in plants. v. Name the process and the source from which the rat got the gas to survive. B. The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions: [5] i. Name the phenomenon that is depicted in the diagram. Define the phenomenon. ii. Give the technical term for the point of contact between the two nerve cells. iii. Name the parts numbered 1, 2 and 3. iv. How does the arrangement of neurons in the spinal cord differ from that of the brain? v. Write down the path of the phenomenon in logical sequence. Question 6. A. The diagram given alongside refers to the ear of a mammal: [3] Name the structure which: i. Converts sound waves into mechanical vibrations. ii. Converts vibrations into nerve impulses. iii. Transmits impulse to the brain. iv. Equalizes atmospheric pressure and pressure in the ear. v. Differentiate between Dynamic balance and Static balance (parts responsible) B. Draw a neat labelled figure of the nucleus of animal cell having 6 chromosomes as it would appear during metaphase of mitosis and label the following: [2] i. Spindle fibres ii. Chromosomes iii. Centromere iv. Aster. Grade 10 Subject: Biology Page: 5 C. Complete the following table following table by filling the blanks 1 to 10 with the appropriate terms: [5] S.No. 1. 2. 3. 4. 5. Gland Thyroid 3. 5. Lacrimal gland Adrenal medulla Question 7. A. Define the following terms : i. Cytokinesis B. Give expanded forms of : i. NADP Secretion 1. Vasopressin 6. 7. 9. Function/Effect on body 2. 4. Promotes glucose utilization by the body cells. 8. 10. [3] ii. Osmoregulation iii. Imbibition [2] ii. DNA C. The diagram given below represents an experiment conducted to prove the importance of a factor in photosynthesis. Study the same and then answer the questions that follow: [5] i. Name the factor being studied in this experiment. ii. Why was the plant kept in a dark room before conducting the experiment? iii. Why was the experimental leaf then kept in (1) boiling water (2) methylated spirit? iv. Name the solution used to test for presence of starch in the leaf. v. What will you observe in the experimental leaf at the end of the starch test? vi. Mention any two adaptations found in plants to favour the process of photosynthesis. **********************************
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