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DELHI PUBLIC SCHOOL NEWTOWN SESSION 2018-2019 PREBOARD EXAMINATION CLASS: X SUBJECT: BIOLOGY [SET: A] FULL MARKS: 80 TIME: 2 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 [ ]. This question paper consists of 7 printed pages. SECTION I (40 Marks) Attempt all questions from this Section QUESTION 1 (a) Name the following: [5] i. Specialised cells in the ovary and testis that undergo meiosis. ii. The process by which plants lose water in the liquid state. iii. The substance released by injured tissue cells and platelets at the site of a wound. iv. The fluid entering the renal tubule. v. Outermost tough protective membrane of the meninges. (b) Correct the following statements by changing the underlined word only: i. Methanol is released at the synapse. ii. Deficiency of insulin causes diabetes insipidus. iii. Menopause is the onset of menstruation in a young female. iv. Australopithecus were the first ancestors to hunt animals and use fire. v. Demography is the number of individuals living per km2 at any given time. [5] (c) Give the technical terms for the following: i. Ligation of the oviducts in females. ii. A wave of electrical disturbance that sweeps over the nerve cell. iii. A rise in blood pressure above 140/90. iv. Addition of phosphate to form ATP in the presence of light. v. The tendency of water molecules to remain joined to each other. [5] (d) Given below are six sets, with four terms each. In each set, one term is odd and cannot be grouped under the 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 for you as an example: [5] Example: Nose, Tongue, Arm, Eye A/1
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