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PREBOARD EXAM-2017 Class X Subject BIOLOGY (Time One hour and a half) (Full Marks 80) 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 [ ]. SECTION I (40 Marks) Attempt all questions from this Section Question 1 Name the following : [5] (i) The process of uptake of mineral ions against the concentration gradient using energy from cell. (ii) The form in which glucose stored in the liver. (iii) The vein that carries oxygenated blood. (iv) The between the parents having one pair of contrasting character. (v) The structure formed by the villi of an embryo and the uterus of the mother. b) The statements below are false: REWRITE the correct form of the statement by changing the word which is underlined: [5] i) Alpha cells of pancreas secrete Insulin. ii) Formalin is an example of Antiseptic. iii) CNG is mainly responsible for the formation of Acid rain. iv) Sulphadiazine is an example of an antiseptic. (vi) Cretinism is caused due to deficiency of Adrenaline. c) Mention the exact location of the following structures: [5] i) Thylakoids. ii) Organ of corti iii) Lenticels iv) Bicuspid valve v) Loop of henle d) Match the column A with that which is most appropriate in column B. Rewrite the matching pair: [5] COLUMN A COLUMN B i)Testis i)kidney ii)Poliomyeletis ii)water vapour iii) Transpiration iii) Prostate gland iv)Clotting of blood iv) iron v)Uriniferous tubule v) uterus vi)gonad vii)Salk s vaccine viii)Water droplet ix)calcium x) TAB vaccine. P.T.O. .2 e) Given below is an example of certain structure and their special functional activities: [5] for ex: Eye and vision: On a similar pattern complete the following: i) Neutrophils and ii) Ureter and iii) Neurotransmitter and .. iv) Iris of the eye . v) Placenta and f) Given below is a a set of items belongings to a common category. State the odd one out and mention the category for others: [5] i) Glucose, starch, cellulose, calcium ii)Pleura, pericardium, meninges, spinal cord. iii) adrenalin, penicillin, Insulin, thyroxine. iv) BCG, cholera, rabies, tuberculosis v)Phenol, boric acid, iodine, mercurochrome. g)Explain the following terms: [5] i) guttation ii) antibiotic iii) mutation iv) photolysis of water v) Natality. h) i) Diagrammatically represent the structure of male gamette and label its parts.[3+2=5] ii) Arrange in logical sequence: a) ear ossicles, oval window, tympanum, auditory canal, cochlea. b) aorta, hepatic vein, hepatic portal vein, gut, liver. Section-B(Any four) Q2 a)Given below is a diagrammatic representation of a certain part of the process of circulation of blood in man. Study the same and then answer the questions that follows: i) Name the parts labeled 1,2,4 and 6. ii)Give the number and name of the vessel which contains the maximum amount of urea a few hours after a protein rich emal. iii) Draw a neat labeled diagram of the cross sectional view of the blood vessel numbered 3. iv) Mention two structural difference between blood vessels 3 and 8 . [5] Cont 3 ..3 . b) Difference between the following pairs on the basis of what is given in brackets. i)Lymphocytes and Neutrophils ( Structure of the nucleus) ii) Beginning of ventricular systole and the end of the ventricular systole( type of heart sound) iii)Prostate and Cowper s gland (the nature of secretion) iv) Rod cells and Cone cells(pigment) v)Simple goitre and exophthalmic goiter(cause of the disorder) [5] Q3. The diagram given below shows a section of a Human kidney. Study the diagram carefully and answer the questions that follows. i)Label the parts numbered 1 to 4. [5] ii) Why does part 2 has striped appearance? iii)What is the fluid passed down through part 4? Name the nitrogenous waste present in it. iv) Mention the structure and functional units of kidneys. v)Name the two major steps in the formation of the fluid mentioned in Q3(iii). b) Draw neat and labeled diagrams of the i)Malphigian capsule ii) A myelinated neuron. [5] Q4. a) A potted plant was taken in order to prove a factor necessary for Photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in Sunlight for few hours. (i) What aspect of Photosynthesis was being tested? (ii) Why was the plant placed in dark before beginning the experiment? (iii) During the starch test why was the leaf: a) boiled in water b) boiled in methylated spirit. (iv) Write a balanced chemical equation to represent the process of Photosynthesis (v) Draw a neat labeled diagram of a chloroplast. [5] b) Give scientific reasons for the following statements: [5] (i) Use of CFC is banned in many countries. (ii) We cannot distinguish colors in moonlight (iii) CO is highly dangerous when inhaled. Cont .4 ..4 . Q5.a) Given below is a diagram of the lateral section of a testis of a man. Study the same and answer the questions that follow: i) ii) iii) Label the parts numbered 1 to 4 of the diagram. State the functions of the parts labeled 1 and 3. What is the significance of the testes being located in the scrotal sac outside the abdomen? iv) What is the role played by the inguinal canal? v) What is semen? [5] b) Give the biological terms for the following: i) Chemical found in the blood which act against antigens. ii)The onset of menstruation in a young girl. iii) The fluid present between the layers of meninges. iv)An antiseptic substance present in tears. v)A solution in which the relative concentration of water molecules and the solute on either side of the cell membrane is the same. [5] Q6. a) The figure given below shows the epidermal cells of an onion bulb. This cell was then transferred to drop of sugar solution. i)Draw a well labeled diagram of the epidermal cell as it would appear after immersion in a strong sugar solution. ii) What scientific term is used for the changes as shown in (i) above? iii) What should be done to restore the cell back to its original condition? iv)Give the scientific term for the recovery of the cell as a result of the step taken in(iii) above. v)Define the term osmosis. [5] Cont ..5 ..5 . b) i) List any two major activities of the Red Cross. ii)Write any two major reasons for the population explosion in the world. iii) Write the names of four nitrogenous bases in a DNA. [5] Q7. a)Given below is the diagram depicting a defect of the human eye. Study the same and then answer the questions that follow: i)Name the defect shown in the diagram. ii)Name two possible reasons for this defect of the eye in human beings iii)Name the parts labeled 1 to 4. iv)Draw a labeled diagram to show how the above mentioned defect is rectified using an appropriate lens. [5] b) i)State Mendel s law of independent assortment. ii) A homozygous Tall plant (T) bearing red coloured (R) flowers is crossed with a homozygous dwarf plant (t) bearing white flowers(r): a)Give the genotype and phenotype of the F1 generation. b) Give the possible combinations of the gametes that can be obtained from the F1hybrid. c)Give the dihybrid ratio and the phenotype of the offsprings of F2 generations when two plants of the F1 generation above are crossed. [5] xxxxxx
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