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BIOLOGY SCIENCE PAPER - 3 (Two 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 A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ]. _____________________________________________________________________________________ SECTION A (40 Marks) (Attempt all questions from this Section.) Question 1. a) Name the following: [5] i) Opening on the leaf through which transpiration occurs. ii) The element required for clotting of blood. iii) The vein which starts with capillaries and also ends in capillaries. iv) The branch of the renal artery which leaves the Bowman s capsule. v) The condition in which excess glucose passes with urine due to diabetes mellitus. b) Choose the correct answer from the four options given below each statement: i) [5] Which one of the following pairs of brain part and its function is not correctly matched? A. Cerebrum memory B. Cerebellum balance of body C. Medulla oblongata controls activities of internal organs D. Pons consciousness ii) A light absorbing pigment during photosynthesis is: A. Oxygen B. Carbon dioxide C. Water D. Chlorophyll iii) Maximum amount of water from the glomerular filtrate is reabsorbed in _____ A. Proximal convoluted tubule. B. Descending limb of loop of Henle. 1 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School C. Ascending limb of loop of Henle. D. Distal convoluted tubule. iv) Which of the following is not involved in the knee-jerk reflex? A. Spinal cord B. Motor neuron C. Connecting neuron D. Sensory neuron v) When a doctor is recording your pulse, he is pressing on your wrist exactly on a _____ A. Vein B. Capillary C. Artery D. Arteriole c) Give the exact location of the following: i) [5] Lenticles ii) Adrenal gland iii) Centromere iv) Aortic semilunar Valve v) Macula lutea d) State the specific functions of the following: i) [5] Mitral valve ii) Thyroxine iii) Potometer iv) Eustachian tube v) Hydathodes e) Study the following diagram carefully and then answer the questions that follow: 2 [5] Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School i) Identify the defect shown in the diagram. ii) Give two possible reasons of the above defect. iii) Draw a neat and well labelled diagram to show how the defect can be rectified. f) Given below are groups of terms. In each group, the first pair indicates, the relationship that exists between the terms. Rewrite and complete the second pair. Example: Lungs Respiration, Kidneys - Excretion i) Diffusion Direct contact, Osmosis - ___________________ ii) Blind spot No vision, Fovea centralis - _____________________ iii) Semi circular canals Dynamic equilibrium, Utriculus and Sacculus - _____________ iv) Stroma Biosynthetic phase, Thylakoids - _______________________ v) Glomerulus Ultrafilteration, Loop of Henle - _____________________ g) Match the items in column A with the most appropriate item in column B. Rewrite the matching pairs. [5] Column A 1. Flaccidity 2. Insulin 3. Photolysis 4.Dry Cobalt chloride paper 5. Reverse of prophase Column B (a) Anaphase (b) Pink (c) Light independent phase (d) Telophase (e) Alpha cells (f) Light dependent phase (g) Hypotonic solution (h) Beta cells (i) Blue (j) Reverse of turgidity h) Given below are five sets of terms consisting of four biological terms each. In each set, a term is an odd one and cannot be grouped in the same 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 has been done for you as an example. S.No Set Example Nuclear pores, Nucleolus, Ribosomes, Chromatin material i) [5] Odd one Category Ribosomes Nucleus of a cell Sclera, Choroid, Retina, Yellow spot ii) Oval window, Round window, Ear ossicles, Cochlea iii) Glycolysis, Photolysis, Photophosphorylation, Polymerisation 3 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School iv) Thrombin, serum, basophils, fibrinogen v) GH, FSH, LH, ACTH SECTION B (40 Marks) (Attempt any four questions from this Section.) Question 2. A. The diagram below represents the human heart in one phase of its functional activities. Study the same and then answer the questions that follow: [5] i) Name the phase. ii) Label parts 3, 4 and 5. iii) Which part of the heart is contracting in this phase? Give reasons to support your answer. iv) Draw a well labeled diagram of parts labeled 1 and 2 to show structural differences between them. A. Answer the following questions: [5] i) Draw the basic structure of a nucleotide. ii) Each DNA strand is composed of repeating nucleotides; name the three components that make up each nucleotide. iii) Give the full name of DNA. iv) Name the type of bond present in the DNA strand. v) What are genes? Question 3. A. Complete the following table by filling in the blanks from 1 to 10 with appropriate terms: Gland Secretion 1 2 3 Adrenaline 4 Pituitary (Anterior lobe) 5 Body growth 4 [5] One important function Increases reabsorption of water from kidneys Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School B. Look at the diagram given below and answer the questions that follow: i) ii) iii) iv) [5] Label parts 1, 2, 3 and 8. Name the two major steps involved in urine formation. Name the fluid in part labeled 7. Write the main function of the parts labeled 4, 5 and 6. Question 4. A. Look at the diagram given below and answer the questions that follow: [5] i) Identify the processes being studied. ii) Explain the process. iii) What change will you observe in the thistle funnel containing sugar solution after 10 minutes? iv) Is the sugar solution hypertonic or hypotonic? v) Do you think the process will stop after some time? Give reasons to support your answer. 5 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School B. Explain the following terms: i) Karyokinesis ii) Destarching iii) Carbon cycle iv) Conditioned reflex v) Corneal opacities [5] Question 5. A. Look at the diagram given below and answer the questions that follow: i) Name the factor being studied in the above experiment. ii) Why is the plant kept in a dark room before conducting the experiment? [5] iii) Why was the experimental leaf kept in: a) b) Boiling water Methylated spirit iv) What will you observe in the experimental leaf at the end of starch test? v) Give a balanced chemical equation to represent the process of photosynthesis. B. The diagram below represents a stage during cell division. Study the same and then answer the questions that follow: [5] 6 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School Question 6. i) ii) iii) iv) Name the parts labelled 1, 2 and 3. Identify the above stage and give a reason to support your answer. Mention where in the body this type of cell division occurs. Name the stage prior to this stage and draw a diagram to represent the same. A. Give reasons for the following: [5] i) ii) iii) iv) v) Photosynthesis is considered as a process supporting all life on earth. Stomata close at night. A closed can of dry seeds bursts open if some water enters it by accident. Some plants have sunken stomata. Concentration of mineral nutrient elements is higher inside the root-hairs than in the surrounding soil yet roots take them in from the soil. B. Answer the following questions: [5] i) Define: a) Imbibition b) Adaptation of the eye c) Natural reflexes (Explain with the help of an example) ii) Draw a well labeled diagram of the chloroplast Question 7. A. The diagram given below depicts the cross section of the spinal cord. Study the same and then answer the questions that follow. [5] i) Name the process that is being depicted. ii) Name the parts labeled 2, 5 and 6. iii) Name the cells in contact with the part labeled `1 . iv) What is the function of the parts labeled 3, 4 and 7? What is the technical term given to the pathway represented by 3, 4 and 7? v) How does the arrangement of cells in the spinal cord differ from that in the brain? 7 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School B. Study the diagram given below carefully and answer the questions that follow: i) ii) iii) [5] Label the parts numbered 1, 2, 3, 4, 7 and 10 of the diagram shown above. Write the main function of the part labeled 5, 6 and 9. Name the two fluids that are found in part labeled 6. 8 Biology Mock Board Exam 2020 - 21 Class 10 Strawberry Fields High School
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