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ICSE Class X Prelims 2023 : Biology (The Bishop's Co - Ed School, Undri, Pune)

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THE BISHOP S CO-ED SCHOOL, UNDRI FIRST PRELIMINARY EXAMINATION 2022-23 BIOLOGY (SCIENCE PAPER -3) (Two hours) CLASS-X MAX.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. SECTION A (40 Marks) Attempt all questions from this Section Question 1 Select the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only): [15] (i) The impulse of the heartbeat originates from : (a) AVN (b) SAN (c) Lymphatic node (d) Cardiac nerve (ii) Each second, the nerve impulse depicts the ability to travel at a greatest speed of about: (a) 100 metres (b) 200 metres (c) 400 metres (d) 5oo metres (iii) The name pupil comes from the latin word pupa which literally means : (a) Hazy image (b) Scattered image (c) Bigger image (d) Doll (iv) As, conditioned reflex is non-hereditary, due to this reason it is also known as: (a) (b) (c) (d) Natural reflex Inborn reflex Simple reflex Acquired reflex (v) How much quantity of water is reabsorbed with the help of proximal convoluted tubule : (a) (b) (c) (d) Two thirds One- third Three fourth Two fourth Page 1 of 6 (vi) Which German Scientist first discovered Chromosomes in animals : (a) Rosalind Franklin (b) Gregor Mendel (c) Walther Flemming (d) Wilhelm Johanssen (vii) The process in which the living or dead plant cells draw water through surface attraction is called: (a) Endosmosis (b) Swelling (c) Plasmolysis (d) Imbibition (viii) The process which contributes in the production of sperms in seminiferous tubules is known as: (a) Spermatogenesis (b) Oogenesis (c) Meiosis (d) Mitosis (ix) Abscisic acid is also known by the term of: (a) Growth hormone (b) Sex hormone (c) Stress hormone (d) Follicle stimulating hormone (x) Which one of the following is considered as the emergency hormone? (a) Growth hormone (b) Thyroid- stimulating hormone (c) Adrenaline hormone (d) Cortisol (xi) Farmer s potometer and Ganong s potometer are used to measure: (a) Rate of water intake by a plant (b) Rate of water unused by a plant (c) Rate of water emitted by a plant (d) Suction force (xii) Which of the following problems is not created by noise pollution? (a) Irritation (b) Diarrhea (c) Deafness (d) Loss of concentration (xiii) Which day is observed as world population day? (a) 12th May (b) 14th June (c) 5th July (d) 11th July Page 2 of 6 (xiv) The inner ear is also referred to as: (a) Cochlea (b) Endolymph (c) Membranous labyrinth (d) Perilymph (xv) Which of the following is the genotypic dihybrid ratio in F 2 generation? (a) 9 : 3 : 3 : 1 (b) 3 : 6 : 2 (c) 8 : 4 : 2 (d) 1:2:1 Question 2 (i) Name the following: [5] (a) The type of gene, which in the presence of a contrasting allele is not expressed. (b) The tuft of capillaries inside the Bowman s capsule. (c) The hormone secreted by the alpha cells of Islets of Langerhans of the pancreas. (d) A pollutant which is mainly responsible for causing acid rain. (e) Number of deaths per 1000 of population per year. (ii) Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined. [5] (a) Root hair, Cortex, Xylem, Endodermis, Epidermis (b) Auditory canal, Oval window, tympanum, Cochlea, ear ossicles (c) Vena cava, Right ventricle, Right auricle, lungs, Pulmonary artery (d) Pupil, Vitreous humour, Eye lens, Optic nerve, Macula lutea (e) Egg, Foetus, Zygote, Embryo, Blastocyst (iii) Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pair: [5] Column I (a) Demography (b) Radiation pollutant (c) Cobalt chloride paper (d) Birth rate (e) Iodine solution Column II 1. Natality 2. Transpiration 3. Photosynthesis 4. Statistical study of human population 5. Mortality 6. Plasmolysis 7. Iodine 131 (iv) Choose the odd one out from the following terms and name the category to which the others belong: [5] (a) Adrenaline, penicillin, insulin, thyroxin. (b) Polythene bag, Crop residue, Animal waste, Decaying vegetable. (c) Axon, Dendron, Photon, Cyton. (d) Centrosome, Cell wall, Cell membrane, Large vacuoles (e) Cytokinins, Auxin, Growth hormone, Absisic acid, Ethylene Page 3 of 6 (v) Give the exact location of the following: [5] (a) Pituitary gland (b) Epididymis (c) Mitral valve (d) Myelin sheath (e) Thyroid gland SECTION B (40 Marks) Attempt any four questions from this Section Question 3 (i) Define the term Parthenocarpy. (ii) [1] Differentiate between Basophils and Monocytes with reference to their function. (iii) What is chemotropism? Give one example (iv) State Mendel s Law of Dominance [2] [2] . [2] (v) Study the diagram given below and answer the following questions: [3] (a) Name the type of pollution shown in the picture. (b) Write one measure to reduce this pollution. (c) State one gaseous compound that leads to the depletion of the ozone layer and creates Ozone holes . (d) Question 4 (i) Expand the abbreviation ACTH [1] (ii) Explain how the rate of transpiration is affected on a. A windy day b. A cloudy day [2] (iii) Explain why potato cubes when placed in water become firm and increase in size. [2] (iv) What is meant by a destarched plant ? Why is a leaf boiled in methylated spirit during Iodine test? [2] Page 4 of 6 (v) Given below is a diagram representing a stage during mitotic cell division. Study it carefully and answer the questions that follow : [3] (a) Is it a plant cell or an animal cell? Give a reason to support your answer. (b) Identify the stage shown. (c) Name the stage that follows the one shown here. How is that stage identified? Question 5 (i) Define the term Micturition. [1] (ii) Testis lies outside the abdominal cavity. Give reason [2] (iii) Differentiate between Cerebrum and Spinal cord with reference to the arrangement of nerve cells. [2] (iv) Explain why veins have valves at intervals in their inner lining whereas arteries do not have valves. [2] (v) Draw a neat labelled diagram of a Stomatal apparatus. [3] Question 6 (i) Define the term Genome. [1] (ii) Explain why we feel dizzy when we spin around. [2] (iii) Write two functions of the cerebrospinal fluid. [2] (iv) Why do people living in hilly areas suffer from simple goitre? [2] (v) Given below is a diagrammatic representation of a defect of the human eye : [3] (i) Identify-the defect. (ii) Mention two reasons for the above defect. (iii) State how the defect can be rectified. Page 5 of 6 Question 7 (i) Define the term Photolysis. [1] (ii) Give two reasons for sharp rise in human population in India. [2] (iii) Mention two functions of placenta. [2] (iv) Write the difference between Sympathetic and Parasympathetic nervous system. [2] (v) Draw a neat labelled diagram of a human sperm. [3] Question 8 (i) Define the term Reflex action. [1] (ii) Why does the Renal cortex show a dotted appearance? Name the main nitrogenous waste present in urine. [2] (iii) State the exact location of the endolymph. What is the nature of image formed on the retina? [2] (iv) In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a). Answer the following questions: [2] (a) What is the phenotype of the F1 generation if a plant bearing pure axial flowers is crossed with a plant bearing pure terminal flowers? (b) Draw a Punnett square to show the gametes and offsprings when both the parent plants are heterozygous for axial flowers. (v) The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow: [3] (a) Name the phase. (b) Differentiate between parts labeled 1 and 2 with reference to the type of blood flowing through them. (c) What causes the heart sound LUBB ? Page 6 of 6

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