ICSE 2019 Biology Question Paper Solved for Class 10February 19, 2023 by PrasannaPowered ByPlayMuteLoaded: 6.77%FullscreenICSE Biology Previous year Question Paper 2019 Solved for Class 10ICSE 2019 Biology Board Question Paper SolvedGeneral 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 [ ].Section -1 (40 Marks)(Attempt All questions from this section)Question 1.(a) Name the following : [5](i) The layer of the eyeball that provide nourishment to the eye.(ii) One gaseous compound which depletes the ozone layer.(iii) The structure which connects the placenta and the foetus.(iv) A pair of corresponding chromosomes of the same shape and size and derived one from each parent.(v) The compound formed when haemoglobin combines with carbon dioxide in blood.Answer:(i) Choroid(ii) Chlorofluorocarbon(iii) Umbilical Cord(iv) Homologous Chromosome(v) Carbaminohaemoglobin(b) Correct and rewrite the statement by changing the biological term that is underlined for each statement: [5](i) The theory of Inheritance of Acquired Characters was proposed by Watson and Crick.(ii The protective sac which develops around the developing embryo is called the Pericardium.(iii) Maintaining balance of the body and coordinating muscular activities is carried by the cerebrum.(iv) The kidney is composed of number of neurons.(v) The part of the eye which can be donated from a clinically dead person is the Retina.Answer:(i) The theory of inheritance of Acquired Characters was proposed by Jean Baptiste de Lamark.(ii) The protective sac which develops around the developing embryo is called amnion.(iii) Maintaining balance of the body and coordinating muscular activities is carried out by the Cerebellum.(iv) The kidney is composed of number of nephrons.(v) The part of the eye which can be donated from a clinically dead person is cornea.(c) Give suitable biological reasons for the following statements : [5](i) The birth rate in India is very high.(ii) Carbon monoxide is dangerous when inhaled.(in) Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them.(iv) Acid rain is harmful to the environment.(v) All life on Earth is supported by Photosynthesis.Answer:(i) Due to better medical care there is a fall in death rate both for infants and the old. As long as birth rate exceeds death rate population grows rapidly.(ii) Haemoglobin has very strong affinity for carbon monoxide, forming a stable compound carboxyhaemoglobin. This cuts down the capacity of blood for transporting oxygen, sometimes resulting in death.(iii) Excessive fertilizers make the soil hypertonic as compared to root hair cells. Exosmosis takes place and root hair cells become flaccid due to which they droop.(iv) Acid rain is dangerous for vegetation, decays building materials, paints and corrodes building and monuments and statues. It acidifies lakes and streams which affect aquatic life.(v) Provides oxygen for respiration. Provides food and maintains food chain.(d) Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs. [5]Answer:(e) Choose the correct answer from the four options given below : [5](i) While recording the pulse rate, where exactly does a doctor press on our wrist?A. NerveB. VeinC. ArteryD. CapillaryAnswer:C. Artery(ii) In a human male, a sperm will contain :A. Both X and Y chromosomesB. Only Y ChromosomesC. Only X chromosomeD. Either X or Y ChromosomesAnswer:A. Both X and Y chromosomes(iii) A muscular wall is absent in :A. CapillaryB. VenuleC. ArterioleD. VeinAnswer:A. Capillary(iv) On which day of the menstrual cycle does ovulation take place ?A. 5th dayB. 28th dayC. 14th dayD. 1st dayAnswer:C. 14th day(v) Which one of the following does not affect the rate of transpiration ?A. LightB. HumidityC. WindD. Age of the plantAnswer:D. Age of the plant(f) Identify the ODD term in each set and name the CATEGORY to which the remaining three belong : [5]Example: glucose, starch, cellulose, calcium, Odd term: calcium.(i) Addison’s disease, Cushing’s Syndrome, Acromegaly, Leukemia.(ii) Insulin, Adrenaline, Pepsin, Thyroxine.(iii) Axon, Dendron, Photon, Cyton.(iv) Chicken pox, Colour blindness, Haemophilia, Albinism.(v) Polythene bag, Crop residue, Animal waste, Decaying vegetable.Answer:(g) Expand the following biological abbreviations : [5](i) ABA(ii) IAA(iii) ATP(iv) DNA(v) TSHAnswer:(i) Abscisic acid(ii) Indole acetic acid(iii) Adenosine triphosphate(iv) Deoxyribonucleic acid(v) Thyroid stimulating hormone(h) Study the picture given below and answer the following questions: [5](i) Identify the type of pollution.(ii) Name one pollutant that causes the above pollution.(iii) Mention the impact of this pollution on human health.(iv) State one measure to control this pollution.(v) What is a ‘Pollutant’? Explain the term.Answer:(i) Water pollution(ii) Detergents, Chemicals(iii) Cholera, Jaundice, Typhoid, Dysentery, Diarrhoea(iv) We should treat the poisonous substances and discharge materials and toxic substances coming out of the homes and factories before discharging them into the rivers and ponds. We should not mix petroleum substances in the water. Dead bodies should not be thrown in the river. We should set more and more sewage treatment plants that play a crucial role in the reclaimed polluted water. Effective steps should be taken to outlaw dumping of wastes into a river or other water sources.(v) Agents causing pollution are called pollutants.Example, Gaseous pollutants are so2 , co2 and co.Chemical pollutants like fertilizers, pesticide and insecticide.Section – II (40 Marks)Attempt any four questions from this Section.Question 2.Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow : [5](i) Label the parts 1 and 2.(ii) Name the tropic movement shown by part 1.(iii) Part 1 is affected by two stimuli. Name them. Which one of the two is stronger?(iv) What is Thigmotropism ? Give one example.(v) What is meant by ‘Positive’ and ‘Negative’ tropic movements in plants?Answer:(i) 1 – Radicle 2 – Plumule(ii) Hydrotropism(iii) Gravity and Water – Water is stronger.(iv) Growth movement of plants in response to touch stimulus, e.g., Sweet Pea(v) Movement of parts of plant towards source of stimulus is positive and away from source of stimulus is negative.(b) Mention the exact location of the following : [5](i) Testis(ii) Incus(iii) Thylakoids(iv) Amniotic fluid(v) Corpus callosumAnswer:(i) Inside Scrotum(ii) Between malleus and stapes.(iii) In the stroma (matrix) of chloroplast(iv) Cavity between amnion and embryo(v) Between two cerebral hemispheres.Question 3.(a) The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow : [5](i) Name the factor studied in this experiment.(ii) What will you observe in the experimental leaf after the starch test?(iii) Explain the process of Photosynthesis.(iv) Give a balanced chemical equation to represent the process of photosynthesis.(v) Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.Answer :(i) Sunlight(ii) The exposed parts will turn blue-black with iodine solution while the part covered with black paper strip turns brown.(iii) The process by which green plants containing chlorophyll produce food (glucose) from carbon dioxide and water by using light energy.(iv)(v)(b) State the main functions of the following : [5](i) Medulla Oblongata(ii) Cytokinins(iii) Tears(iv) Coronary Artery(v) Seminal Vesicles