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ST. JOHN S UNIVERSAL SCHOOL FIRST PRELIM EXAMINATION 2020 2021 BIOLOGY GRADE: X MARKS:80 DATE: 5/10/2020 TIMING:2 Hrs Answers to this paper must be written on the paper provided separately. You are not allowed to write for the first 15 minutes. This time is to be spent in reading your question paper. The time given at the head of the 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: [5] i. The type of bond which joins complementary nitrogenous bases. ii. The process by which water enters root hairs. iii. The structure in a leaf that allows guttation. iv. The source of CO2 in aquatic plants. v. The smallest common blood vessels formed by the union of capillaries. B. Given below are sets of five terms each. Without changing the first term, rearrange the remaining four. Example:- DNA [5] Nucleosome Chromatin fibre Chromosome. (Formation of chromosome) i. Insects, Snake, Frog, Peacock, Grass. (Food Chain) ii. Metaphase, Telophase, Anaphase, Prophase. (karyokinesis) iii. Xylem, Cortex, Endodermis, Phloem, Root hair. (Cell to Cell conduction of water) iv. Photons, hydrogen and hydroxyl ions, Grana, Water, Oxygen. (Light phase of photosynthesis). v. Platelets disintegrate, Fibrinogen, Fibrin, Thrombus, Thrombokinase. (Clotting process of blood) C. Give the specific function of the following structures found in plants/animals [5] i. Lenticels ii. Histones iii.Cell membrane iv. Pericardial fluid v. Guard cells
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