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Class Subject Exam Date Marks Time 10 Biology 2nd Prelim 05.02.20 16 80 2 hrs Total No. of Pages 7 SECTION I [40 marks] Attempt all questions Question 1 a. Name the following[5] i. The cells of retina that is sensitive to colour. ii. The disorder in which the child is of short stature and mentally retarded . iii. The statistical study of human population. iv. A substance that initiates an immune response. v. The junction between two nerve cells. b. State whether the following statements are true or false. If false write the correct statement by changing the underlined words only[5] i. Antitoxins are extracts of toxins, secreted by bacteria, which is made harmless. ii. Photolysis is the splitting of water molecules into Hydrogen and Hydroxyl ions by light. iii. Hypotonic solution is one in which concentration of solute is more than the cell sap. iv. The phase of cardiac cycle in which the auricles contract is called Auricular systole. v. Urea is produced in kidney. c. Arrange the following terms so as to be in a logical sequence[5] i. Ovum, Graafian follicle, Oviducal funnel, Uterus, Fallopian tube ii. Active immunity, Antigen, Antibody, Bacteria, Lymphocytes iii. Oval window, Tympanum, Cochlea, Auditory canal, Ear ossicles iv. Pallisade tissue, Stoma, Upper epidermis, Spongy cells, Substomatal space v. Renal vein, Renal artery, Afferent arteriole, Efferent arteriole, Glomerulus d. State the main functions of the following[5] i. Placenta ii. Chordae tendinae iii. Thylakoids iv. Thyroxin v. Iris e. Explain the following terms[5] i. Antiseptic ii. Homologous chromosome iii. Natural immunity iv. Anti-transpirants v. Imbibition f. Give the exact location of the :[5] i. ii. iii. iv. v. Hydathodes Malpighian body Adrenal gland Corpus callosum Acrosome g. Match the items in column A with that which is most appropriate in column B. Rewrite the matching pairs:[5] Column A Potometer Hypothalamus Formalin Contraception in males Mutation Column B Antiseptic Disinfectants Vasectomy Transpiration Pituitary gland Sudden heritable change in genes h. Complete the following by filling in the blanks numbered 1 to 10 with the appropriate words. [5] A plant for experiments on photosynthesis should be initially placed in dark to ____i__ the leaves. To test a leaf for starch first dip the leaf in boiling water for a minute to ___ii__ the cells. Boil the leaf in ______iii__________ _over a water bath till it becomes pale white due to the removal of ___iv_________. Then place it again in hot water to soften it. Spread the leaf in a dish and pour iodine solution on it. ____v_______ colour on the leaf would be indicating the presence of starch. SECTION II [40 MARKS] (ATTEMPT ANY FOUR QUESTIONS OUT OF SIX) Question 2 A] Given below is the diagram of a cell as seen under the microscope after having placed in a solution. [5] 1 2 3 4 i] What is the technical term used for the condition of the cell given above? Ii] Give the technical term for the solution in which the cell was placed. Iii] Name the parts numbered 1 to 4. Iv]Is the cell given above a plant cell or an animal cell? Give two reasons in support of your answer as evident from the diagram. V] What would you do bring this cell back to its original condition? B] Name the hormones which control the following activities in the body:[5] i. Water reabsorption in the kidney. ii.Conversion of glycogen to glucose. iii. Prepares body for the fight and flight response. Iv. Development of secondary sexual characteristics in females. v. Maturation of the follicles in the ovary. Question 3 A] i.State Mendel s law of segregation . [5] ii. A homozygous plant with red flowers [R] and green pods[G] is crossed with homozygous plant with white flowers[r] and yellow pods[g] . a) Give the Genotype and Phenotype of the F1 generation. b) What can be the possible combinations of the gametes in F1 hybrid? c) What will be the dihybrid ratio and phenotype of the offsprings of F2 generation when two plants in F1 generation are cross B] Study the diagram given below and answer the questions that follow:-[5] hormones ii What i. Name the part labeled A . Name any two produced by A. happens to the part labeled B. (1) A If B takes place? fertilization (2) If fertilization does not take place? iii. Where does fertilization occur? Iv. Draw a neat and labeled diagram of the human sperm. Question 4 A. Give the biological or technical term for the following- [5] i. Chemicals found in blood which act against antigen. ii. A constituent that causes pollution. iii. The onset of menstruation in young girl. iv. Structure which connects the placenta with the foetus. v. The fluid present between the layers of the meninges. vi. Permanently open structure seen on the bark of an old woody stem. vii. The biological process which is the starting point of food chain. viii. The change in an organism resulting due to stimulus. ix. An antiseptic substance present in tears. x. The type of gene , which in the presence of a contrasting allele is not expressed. B. i. Name the disease for which the following types of vaccines are given(1) Salk vaccine (2) B.C.G ii. Give one example of each of the following(1) A gaseous pollutant (2) An aquatic plant used in the lab to demonstrate Oxygen liberation during photosynthesis. (3) An antibiotic (4) A nitrogenous base in DNA iii. Expand the following terms(1) ATP (2) TSH (3) DPT (4) DNA [5] Question 5 A. Given below is an experimental setup to demonstrate a particular process. Study the same and answer the questions that follow[5] Cobalt chloride paper Dorsal surface Ventral surface i. Name the physiological process being studied. ii. Explain the process mentioned above. iii. What is the aim of the above experiment? iv. What would you observe in the experimental setup after an hour? Give a reason to support your answer. v. Mention any three adaptations found in plants to overcome the physiological process mentioned in (i) above. B. Differentiate between the following pairs on the basis of what is mentioned in brackets. [5] i. Stoma and Stroma (Describe its structure) ii. Transpiration and Guttation (Structures involved) iii. Natality and Mortality (Definition) iv. Acromegaly and Myxoedema (Symptoms) v. Spinal nerves and Cranial nerves (Number) Question 6 A. The diagrams given below show the cross section of two kinds of blood vessels. [5] 1 A 2 B i. Identify the blood vessels A and B. In each case give a reason to support your answer. ii. Name the parts numbered 1 and 2. iii. Name the blood vessel that (1) begins and ends in capillaries (2) supplies blood to the walls of the heart. iv. When are the sounds LUBB and DUP produced during a heart beat? B. i. Draw a neat labeled diagram of the vertical section of a human eye. [5] ii. Differentiate between Myopia and Hypermetropia based on their cause and correction. Question 7. A. Give scientific reasons for the following statements. [5] i. We cannot distinguish colours in moon light. ii. Balsam plants wilt during midday even if the soil is well watered. iii. Throat infection can lead to ear infection. iv. The wall of ventricle is thicker than the auricles. v. A person after consuming alcohol walks clumsily. B. Answer the following. i. Draw a well labeled diagram of a neuron and label the following parts(1) Node of Ranvier (2) Nissl s Granules (3) Cyton ii. Draw a neat labeled diagram of Metaphase with 4 chromosomes and label(1) Chromatid (2) Spindle fibres (3) Aster iii. Mention any two major activities of WHO. [5]
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