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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
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