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PRE- BOARD- II EXAMINATION 2020-2021. BIOLOGY SCIENCE PAPER -3. CLASS X NOTE: 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. Ques 1: (A) Name the following: i) ii) iii) iv) v) [5] The nutritive layer of eye which prevents reflection of light. The inorganic ion present in chlorophyll. The part of chloroplast where light reaction takes place. A process by which plant exudes water from the margins of the leaf. The smallest common blood vessel formed by union of capillaries. (B) Give the main function of: [5] i) Vitreous humour. ii) Lenticels. iii) pericardial fluid. iv) Cuticle. v)Loop of henle. (C ) State whether the following statements are True or False. Correct the false statements and rewrite. [5] i) ii) iii) iv) v) Papillary muscles in the heart holds the apices of valves in position. The cells which have lost their water content are said to be deplasmolysed. Cones enable us to see three primary colours. Glucagon hormone is produced by beta cells. Corpus callosum is the sheet of fibres present between two cerebral hemispheres (D) Given below are the set of five terms without changing the first term rearrange the remaining four. [5] i)Grass, Insects, snake, frog, peacock. [ food chain] ii) Interphase, Metaphase, Telophase, Prophase, Anaphase.[ Karyokinesis] iii) Root hair cells, Xylem, cortex, endodermis, pericycle. [conduction of water] iv) Photon, Hydrogen and hydroxyl ion, grana, water, oxygen.[photolysis]. v)Platelets disintegrates, fibrogen, fibrin, thrombus, thrombokinase.[clotting of blood].
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