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St. Stephen S School, Dum Dum Pre-Board Examination 2020 - 2021 Class X BIOLOGY SCIENCE Paper 3 Total Time: 2 Hours 45 Minutes Full Marks: 80 The first 15 minutes are for reading the question paper. The next 2 hours are for writing the answers. The last 30 minutes are for assembling the answer sheets and creation of PDFs for submission. 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) Evaporation of water from the aerial parts of the plant. (ii) Blood vessel that begins and end in capillaries. (iii) Photoreceptor helping vision in dim light. (iv) Disorder due to insufficient secretion of insulin. (v) A neurotransmitter stored at the terminal end of the axon. (b) Complete and rewrite the following by choosing the correct alternative from the bracket: [5] (i) The chromosomes arrange on the equatorial plane in ______ (Prophase, Metaphase, Anaphase, Telophase) (ii) ______ is a mixed gland having both exocrine and endocrine function (Adrenal, Pituitary, Thyroid, Pancreas). (iii) Grapes when placed in a strong sugar solution shrink because of ______ (endosmosis, exosmosis, turgidity, imbibitions). (iv) The chemical used to reduce transpiration is______ (cobalt chloride, silicon emulsion, KOH, calcium chloride). (v) _______ is responsible for guttation. (Osmotic pressure, Capillary force, Root pressure, Suction pressure) (c) Identify the Odd One and write the Category of the Rest (make two columns): [5] (i) Cerebrum, Ossicles, Cerebellum, Medulla Oblongata. (i) Centrosome, Cell membrane, Cell wall, Large vacuole. (ii) Cretinism, Myxedema, Simple goitre, Acromegaly. (iii) Osmosis, Imbibition, Active transport, Diffusion. (iv) Sodium chloride, Ammonia, Potassium chloride, Creatinine. (d) Correct the following statements by changing the underlined words: [5] (i) Several glucose molecules are transformed to produce one molecule of starch; this process is called phosphorylation. (ii) Presbyopia is a condition in which the lens turns opaque and the vision is cut down even to total blindness. (iii) Diapedesis is the process by which neutrophils engulf bacteria. (iv) Cretinism is caused due to under secretion of adrenaline. (v) The thin delicate middle layer of meninges, giving a web like cushion is Pia mater. (e) Identify and name the following processes / terms from the statements given below: [5] (i) The change in an organism resulting due to stimulus. (ii) The pressure of the cell contents on the cell wall. (iii) The part of ANS stimulated by the hormone adrenaline. (iv) Eye defect in which some parts of the object are seen in focus while others are blurred. (v) Condition in which blood passes with urine due to some infection in urinary tract, kidney stones or tumour. (f) Match the items in Column A with that which is most appropriate in Column B. Rewrite the matching pairs: [5] A (i) Cerebellum (ii) O type (iii) Glucagon (iv) Occurs in the somatic cells (v) ADH secretion reduced (g) B Alpha cells Control all voluntary actions Mitosis Increased production of urine Universal donor Beta cells Meiosis Coordinate muscular activity Universal recipient Decreased production of urine Given below are sets of 5 terms each. Without changing the first term, rearrange the remaining four terms in a logical sequence as per the directions given in brackets for each. [5] (i) Platelets, Thromboplastin, Fibrinogen, Thrombin, Fibrin. (Steps in blood clotting) (ii) G1 Phase, Karyokinesis, Synthesis Phase, Cytokinesis, G2 Phase (Cell cycle) (iii) Dendrites, axon, cell body, synapse, receptors. (Conduction of impulse) (iv) Light rays, vitreous humour, lens, optic nerve, retina. (Image formation) (v) Receptor, Spinal cord, Effector, Motor neuron, Sensory neuron. (Reflex arc pathway) Protect by PDF Anti-Copy for Android (Update to Pro to remove watermark) (h) Given below is a diagram depicting a defect of the human eye. Study the same and then answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) Identify the defect. Name the parts numbered 1, 2, 3 & 4. Give one possible reason that cause this defect. Name the type of lens used to correct this defect. Draw a labelled diagram to show how the above-mentioned defect is rectified. SECTION II (40 MARKS) (Attempt any Four Questions from this section.) Question 2 (a) Given below is an apparatus used to study a particular physiological process in plants. Study the same and then answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) (b) Name the apparatus? Which phenomenon is being studied with the help of this apparatus? Mention one limitation of this apparatus. What is the function of the part marked reservoir ? What is the role of the air bubble in the experiment? What happens to the movement of the air-bubble if the apparatus is kept : 1) In the dark. 2) In sunlight. State where the following are produced/secreted in or from the human body: [5] (i) Antidiuretic Hormone (ii) Glucagon (iii) Red blood cells (iv) Tears (v) Monocytes Question 3 (a) The diagram below represents blood circulation in the human body. Study the same and then answer the questions that follow: [5] (i) (ii) (iii) (iv) (b) Name the blood vessels numbered 1, 3, 6 & 7. Give one structural difference between the blood vessels numbered 4 & 5. Name the blood vessel that supplies the walls of the heart with oxygen. Draw a neat and labelled diagram of the blood vessel numbered 2 as seen in a cross section. Give the appropriate biological or technical terms for the following: [5] (i) The region of distinct vision in the eye. (ii) Process of maintain water and salt balance in the blood. (iii) The contracted condition of the heart. (iv) Hormones that regulate the secretion of other endocrine glands. (v) The first major step in urine formation. Question 4 (a) Study the diagram below and answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) (b) Identify the diagram. Name the parts labeled C & F. What are the parts labeled A & B together called? What is the fluid that comes out of A and passes into B termed? Give the special function of D other than reabsorption. Name the fluid entering structure E . Select words from the bracket () below which best describe or match statements (i) to (v): [5] (Thylakoids, Cerebrum, Cell wall, Lubb, Plasmolysis, Stroma, Medulla, Cell membrane, Turgidity, Dup) (i) Light dependent phase. (ii) Contraction of cytoplasm from the cell wall. (iii) Control the activities of the internal organs. (iv) Very thin layer of all cells. (v) Atrio-ventricular valves get closed sharply. Question 5 (a) A healthy Croton plant bearing variegated leaves was kept in a dark cupboard, after which it was placed in sunlight for few hours. One of the leaves was then plucked and tested for starch. Using the above information, answer the following questions: [5] (i) (ii) (iii) (iv) (v) (b) State the aim of the above experiment. Name the chemical solution used for testing the presence of starch. Give the composition of the solution. Why is the leaf boiled in water and alcohol before testing for the presence of starch? What change is seen on the leaf after the starch test? Give the chemical equation to represent the process of starch formation in plants. Copy and complete the following by filling in the blanks 1 5 with appropriate words/terms: [5] (i) , which is one of the forces to raise water through the stem into the leaves, is built up due to (ii) osmosis in the root tissue. As one (iii) cell presses the next cell, the force of the flow of water (iv) inward. When water reaches the (v) vessels, it enters the pores of their thick walls with considerable force. Question 6 (a) Given below is the diagram of a cell as seen under the microscope after having been placed in a solution. Study the same and then answer the questions that follow: [5] (i) (ii) (iii) (iv) (v) (b) What is the technical term used for this condition? Name the type of solution in which the cell was placed. Name the parts labelled A, B, C and D. How can the cell be revived to its original condition? Give one application of this phenomenon in our daily life. Differentiate between the following based on the condition given in bracket ( ): [5] (i) Mitosis and Meiosis (number of daughter cells formed). (ii) NADP and ACTH (expand the abbreviation) (iii) Human skin cell and human ovum (number of chromosomes) (iv) Cerebrum and Spinal cord. (arrangement of cytons and axons of neuron) (v) Rods and Cones (pigment present) Question 7 (a) Given below is a diagram representing a stage during the mitotic cell division. Study the diagram and answer the following questions: [5] (i) (ii) (iii) (iv) (v) (b) Identify the stage by giving a suitable reason. Name the stage that follows the one shown here. How is that stage identified? Name the type of cell division that occurs during:1) Growth of Shoot 2) Formation of pollen grain What is the technical term for the division of nucleus? What are homologous chromosomes? Study the diagram below and give the number and name of the parts concerned with the following functions: [5] (i) (ii) (iii) (iv) (v) Magnifies the vibration due to lever-like action. Converts vibrations into nerve impulses. Responds to change in position. Transmits impulses to the brain. Equalizes atmospheric pressure and pressure in the ear.
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