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VIBGYOR HIGH Second Preliminary Examination 2020-2021 BIOLOGY SCIENCE Paper - 3 Grade: X Max. Marks : 80 Date : 15/01/2021 Time Allowed: 2 hours INSTRUCTIONS: 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 [ ]. This Paper consists of 10 Printed pages. SECTION I (40 marks) Attempt all questions from this Section. Question 1 (a) Name the following: [5] (i) The part of the brain that carries impulses from one hemisphere of cerebellum to the other hemisphere. (ii) The antiseptic substance present in tears. (iii) A chemical substance used to test the presence of starch in a leaf. (iv) The compound formed when haemoglobin combines with carbon dioxide in the blood. (v) The openings on the stem through which transpiration occurs. (b) Expand the following biological abbreviations: (i) ATP (ii) TSH 1 [5] (iii) NADP (iv) DNA (v) ACTH (c) Given below are groups of terms. In each group the first pair [5] indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis. Example: Oxygen: Inspiration : : Carbon dioxide: Expiration (i) Brain : Meninges : : Heart : ____________ (ii) Thick cuticle : Banyan : : Sunken stomata : ____________ (iii) Iris : Choroid : : Cornea : ____________ (iv) Visking bag : Selectively permeable : : Rubber sheet : ____________ (v) Liver : Glycogen : : Leaf : ____________ (d) Match the items given in Column A with the most appropriate [5] ones in Column B and rewrite the correct matching pairs. Column A Column B i) Proximal convoluted tubule A. Calcium ii) Tubular secretion B. Nearer to bowman s capsule iii) Thyroxine C. Farther from bowman s capsule iv) Distal convoluted tubule D. Ureter v) Clotting of blood E. Iodine F. Iron G. Histamine H. Potassium (e) State the main function of the following: (i) Root hair (ii) Eustachian tube (iii) Guard cell (iv) Myelin sheath (v) Suspensory ligament of the eye 1 [5] (f) Choose the correct answer from the four options given below: (i) Which one of the following is mainly associated with the maintenance of the posture? (ii) (iii) A) Cerebrum B) Cerebellum C) Thalamus D) Pons The nephrons discharge their urine at the: A) Urinary bladder B) Urethra C) Renal pelvis D) Renal pyramid The number of daughter cells formed at the end of meiosis from a cell are: (iv) A) 2 Haploid cells B) 2 Diploid cells C) 4 Haploid cells D) 4 Diploid cells If the concentration of dissolved solute is more in the surrounding solution than in the cells, then the solution is said to be: (v) A) Isotonic B) Hypertonic C) Hypotonic D) Both A and B If there are 46 chromosomes in a cell, then during interphase inside the nucleus there will be: A) 23 chromatin fibres B) 23 chromosomes C) 46 chromatin fibres D) 46 chromosomes 1 [5] (g) Given below are five sets with four terms each. In each set a term [5] 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. One is done as an example for you: Example: Calyx, Corolla, Stamens, Midrib Odd term: midrib Category: Parts of a flower. (i) Loss of leaves, Narrow leaves, Thin Leaves, Rolled leaves (ii) Synthesis phase, G1 phase, M phase, G2 phase (iii) Aldosterone, Adrenaline, Cortisol, Corticosterone (iv) Repair, Variation, Replacement, Growth (v) Cyton, Proton, Axon, Dendron (h) An outline sketch of a tree is shown in the diagram below. Study [5] the same and answer the questions that follow: (i) Name the phenomenon that is labelled A in the diagram. (ii) Explain any one significance of the phenomenon A to the plant. (iii) Explain the role of any three external factors that will increase the rate of the phenomenon A. (iv) What do the direction of arrows in B and C indicate? (v) Name any two physical forces that are responsible for the movement as shown by the arrows in B. 1 Section II (40 marks) Attempt any four questions from this Section. Question 2 (a) The diagram given below shows a section of a human kidney. [5] Study the diagram carefully and answer the questions that follow: (i) Name the parts labelled B and C. (ii) Why does part A have dotted and part D have a striped appearance? (iii) What is the fluid that flows through part E called? Name the part where this fluid is stored temporarily. (iv) Draw a neat labelled diagram of the Malpighian capsule. (b) Give one difference between each of the following pairs on the [5] basis of what is given in the brackets: (i) Near vision and Distant vision (shape of the eye lens) (ii) Lymphocytes and Neutrophils (function) (iii) Beginning of ventricular systole and Beginning of ventricular diastole (type of heart sound) (iv) Simple goitre and Exophthalmic goitre (cause of disorder) (v) Metaphase and Anaphase (position information) 1 of carriers of hereditary Question 3 (a) Given below is a schematic diagram showing different stages in [5] the formation of new DNA. Study the stages and answer the questions. (i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of formation of new DNA. In which stage of interphase of the cell cycle does the above process take place? (ii) How many strands are there in each DNA molecule? What are the repeating units of each DNA strand lengthwise called? (iii) What are the rungs of the DNA ladder made of? (iv) Complete the following: (1) are the proteins that help in the coiling and packaging of DNA into structural units called (2) . The DNA strand winds around the core complex of 8 of these proteins called the (3) . (v) Define the unit of heredity. (b) The below diagram represents longitudinal section of human [5] brain. Study the same and then answer the questions that follow: (i) Label the parts numbered 1, 2, 3 and 4. (ii) What are the folds and grooves in part 4 called? 1 (iii) How many pairs of somatic nerves emerge from the part 3 and part 4? (iv) Which part of the brain: (1) Relays pain and pressure impulses to part 4. (2) Controls reflexes involving eyes and ears. Question 4 (a) A potted plant with variegated leaves was taken in order to prove [5] a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions. (i) What is the aim of the experiment? (ii) What will be the result of the starch test performed on different parts of leaf A shown in the diagram? Explain. (iii) Give an example of a plant with variegated leaves. (iv) While testing the leaf for presence of starch, why is the leaf: (1) Boiled in water? (2) Boiled in methylated spirit? (v) Draw a neat labelled diagram of a chloroplast. (b) Give biological/technical terms for the following: (i) Part of the ear that responds to change in position. (ii) The pressure exerted by cell contents on the cell wall. (iii) The fluid that transports fatty acid and glycerol. (iv) The pigment which captures photons in plants. (v) A thin membrane covering the entire front part of the eye. (vi) The stage of cell division in which the nuclear membrane disappears 1 [5] and the chromosomes become short and thick. (vii) The cutting of a ring round the stem of a plant to remove phloem and cambium. (viii) The exchange of genetic material between non-sister chromatids of homologous chromosomes. (ix) The process of WBC s squeezing out through the walls of the blood capillaries. (x) The organisms who feed on the dead remains of plants and animals and break them down, releasing back the carbon dioxide. Question 5 (a) The figure given below is a diagrammatic representation of a part [5] of the section of the root in the root hair zone. Study the same and then answer the questions that follow: (i) Name the parts indicated by the labels 1 to 4. (ii) What is the state of the cell shown in part 1? (iii) List the three main characteristics of part 1 that are responsible for the movement of water in the direction indicated by the arrows. (iv) Due to an excess of pressure sometimes drops of water are found along the leaf margins of some plants especially in the early mornings. What is the phenomenon called? Give one example of a plant showing this phenomenon. (b) (i) [5] Draw a neat and labelled diagram of the membranous labyrinth found in the inner ear. (ii) How do the ear ossicles contribute in the mechanism of hearing? 1 (iii) Name the fluid present in the median canal of cochlea. (iv) Which structure: (1) Converts sound waves into mechanical vibrations? (2) Converts vibrations into nerve impulses? (3) Collects and directs sound waves to inner part of the ear? (4) Transmits impulses to the brain? Question 6 (a) The diagram below represents a certain category of blood vessels [5] showing a special structure in their walls. Study the same and answer the questions that follow: (i) Identify the kind of blood vessel shown. Name the structure A shown inside the blood vessel. (ii) What is the role of this structure? Towards which side of the figure (top or bottom) is the heart located? (iii) What kind of blood do the above blood vessels carry? Give an exception to this rule. (iv) List two structural characteristics of the blood vessel other than the one shown in the diagram above. (v) Name the blood vessel that starts and ends in capillaries. Give an example. (b) Give biological reasons for the following: (i) Carbon monoxide is highly dangerous when inhaled. (ii) Balsam plants wilt during midday even if the soil is well watered. (iii) There is rapid spread of drooping of leaves in Mimosa pudica plant 1 [5] when touched. (iv) All food chains begin with green plants. (v) A person experiences difficulty in seeing for a short period when he/she switches off the light. Question 7 (a) Explain the following terms: [5] (i) Tropic hormone (ii) Synapse (iii) Osmoregulation (iv) Plasmolysis (v) Insulin shock (b) Complete the following table by filling in the numbered blanks [5] with an appropriate term/answer: Disorder Under secretion/ Specific part of Over secretion of hormone Organ/Gland (i) (ii) Diabetes mellitus (iii) Over secretion of growth (iv) hormone in childhood Cretinism (vii) (v) Under secretion of ADH Acromegaly (ix) ***** 1 (vi) (viii) (x)
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