ICSE Class 10 Biology Question Paper Solution 2019
ICSE Class 10 Biology Question PaperSolution 2019BIOLOGY (PAPER-3 )SECTION I (40 Marks)Attempt all questions from this SectionQuestion 1(a) Name the following:[5](i) The layer of the eyeball that provides 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 onefrom each parent.(v) The compound formed when haemoglobin combines with carbon dioxide in blood.(b) Correct and rewrite the statements by changing the biological term that is underlined foreach statement:(i)The theory of Inheritance of Acquired Characters was proposed by Watson andCrick.(ii) The protective sac which develops around the developing embryo is called thePericardium.(iii) Maintaining balance of the body and coordinating muscular activities is carried outby 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.54[5]
(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.(iii) Root hairs become flaccid and droop when excess fertilizers are added to the moistsoil around them.(iv) Acid rain is harmful to the environment.(v) All life on Earth is supported by Photosynthesis.(d) Match the items given in Column A with the most appropriate ones in Column B and[5]REWRITE the correct matching pairs:Column A(e)Column B(i)Cranial nerves–Testosterone(ii)Leydig cells–Natural reflex(iii)Acetylcholine–12 pairs(iv)Spinal �18 pairs–31 pairs–Conditioned reflexChoose the correct answer from the four options given below:(i) While recording the pulse rate, where exactly does a doctor press on our wrist?(ii)A.NerveB.VeinC.ArteryD.CapillaryIn a human male, a sperm will contain:A.Both X and Y chromosomesB.Only Y chromosomeC.Only X chromosomeD.Either X or Y chromosome55[5]
(iii)(iv)(v)(f)A muscular wall is absent in:A.CapillaryB.VenuleC.ArterioleD.VeinOn which day of the menstrual cycle does ovulation take place?A.5th dayB.28th dayC.14th dayD.1st dayWhich one of the following does not affect the rate of transpiration?A.LightB.HumidityC.WindD.Age of the plantIdentify the ODD term in each set and name the CATEGORY to which the remaining[5]three belong:Example:glucose, starch, cellulose, calciumOdd term: calciumCategory: others are different types of carbohydrates.(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.(g) Expand the following biological [5]
(h)Study the picture given below and answer the following questions:(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.[5]Comments of Examiners(a) (i) Most candidates named the layer of the eyeball(ii)(iii)(iv)(v)that provides nourishment to the eye correctly.However, some candidates could not spell itcorrectly.Majority of the candidates performed well barringsome who were not sure and wrote CO 2 .Many candidates attempted this sub-part of thequestion well. However, some spelt it as ‘Amblicalcord’.Most candidates answered it correctly. However,some wrote Homozygous instead of Homologous.Incorrect answer was written by most candidates.They wrote carboxyhaemoglobin instead ofcarbaminohaemoglobin.(b) (i) Most candidates wrote Mendel and Darwininstead of Lamarck.(ii) This was a well attempted question.(iii) Most candidates answered this sub-part of thequestion correctly. However, in several scriptsspelling errors were noticed.(iv) Answered correctly by most candidates.57Suggestions for teachers- Advise students to read theinstructions given for each questioncarefully.- Explain the parts and functions of eyeand brain using charts, models andinteractive boards.- Clarify the difference betweencarboxyhaemoglobinandcarbaminohaemoglobin, Endosmosisand Exosmosis.- Emphasise on the discoveries madeby Watson and Crick, Mendel,Lamarck and Darwin.- Acquaint students with the hormonessecreted by endocrine glands and thedisorders caused due to their Hypoand Hyper secretions.
(v) Majority of the candidates answered correctly.However, a few candidates wrote Choroid instead ofRetina.(c) (i) Most candidates wrote the correct biological reasonfor the given statement.(ii) Most of the candidates were vague in their answers.Supply of oxygen to tissues being cut off, was notmentioned by many candidates.(iii) Many candidates wrote the correct reason. However,some could not explain using technical terms.(iv) A valid reason was given by most candidates.(v) Majority of the candidates wrote the correct reason.A few could not give the significance of food andO 2 provided by green plants.(d) Most candidates wrote correct matching pairs of itemsgiven in column A and B. However, a few candidateswere not sure of the number of Cranial nerves andSpinal nerves.(e) (i) Most of the candidates wrote the correct option.Some wrote vein instead of artery.(ii) Majority of the candidates wrote incorrect options.They were unaware that sperms are of two types.(iii) Most candidates chose the correct answer from thegiven options.(iv) The correct answer was written by most candidates.(v) All candidates wrote the correct option.(f) (i) Most candidates were able to identify the odd termbut could not identify the category correctly.(ii) Most candidates answered correctly.(iii) Answered correctly by most candidates.(iv) The odd term was identified correctly, but thecategory was mentioned as eye diseases by manycandidates.(v) This subpart of the question was well attempted.(g) (i) Many candidates could not spell Abscisic acidcorrectly.(ii) Many candidates were not sure of the abbreviationIAA and hence wrote Indone for Indole and did notmention the number ‘3’.(iii) Most candidates wrote the correct answer.(iv) Several candidates wrote the correct answer.However, some candidates wrote dioxy for deoxy.(v) Majority of the candidates answered correctly.However, a few wrote Thyroxine for Thyroid.58- Explain the number of cranial andspinal nerves.- Advise students to practice thediagrams of stomatal apparatus and theexperiment to prove that O2 is releasedby green plants during photosynthesis.- Insist upon learning the correctspellings of the biological terms withtheir correct meaning.- Explain to the students to differentiatebetween placenta and umbilical cord. homologous chromosomes andhomozygous condition along withthe meanings of ‘zygous’ and‘logous.’ the location of amnion andamniotic fluid. Neuron and Nephron by drawingthe attention of the students to thefact that Neuron is the fundamentalunit of the nervous system while,Nephrons are units of the kidney.- Discuss in detail the concept ofosmosis, exosmosis and endosmosis.with relevant examples of plant cellsbeing subjected to hypertonic andhypotonic mediums/solutions.- Point out the difference between thenatural reflexes and conditionedreflexes giving relevant examples.- Giving application-based problems inthe class regularly.- Clarify to the students that all ova/eggcontain only X chromosome, while,sperms may contain either X or Ychromosome. Thus, teach the conceptof sex determination in humansclearly.- Clarify menstrual cycle with all thefour phases with appropriate diagrams.- Teach clearly the difference betweencommunicable diseases and hereditarydiseases.
(h) (i)(ii)(iii)(iv)(v)The type of pollution was identified correctly by all candidates.This subpart of the question was answered correctly by most candidates.Most candidates answered correctly.Majority of the candidates answered correctly.Most of the candidates could not explain the term pollutant. ‘Causes Pollution’ was the vagueanswer written by many candidates.MARKING SCHEMEQuestion 1(a)(i)(ii)(iii)(iv)(v)ChoroidChlorofluorocarbon (CFC) or carbon tetrachlorideUmbilical cordHomologous chromosomesCarbaminohaemoglobin/HbCO 2(b)(i)(ii)(iii)(iv)(v)Jean-Baptiste LamarckAmnionCerebellumNephrons/ Uriniferous tubulesCornea(c)(i) Illiteracy, children are a gift of God, sign of prosperity, due to high infant mortality, morehelping hands for family income, do not accept family planning methods, desire for amale child, lack of recreation.(ii) Easily combines with haemoglobin to form carboxyhaemoglobin which cuts off supplyof oxygen to tissues.(iii) Formation of hypertonic solution which results in plasmolysis / exosmosis.(iv) Pollutes soil, damages vegetation, buildings, statues, monuments, kills fish and aquaticanimals.(v) All organisms depend directly or indirectly on green plants for food, beginning of allfood chains, provides oxygen for respiration.(Any alternate correct )Cranial nervesLeydig cellsAcetylcholineSpinal nervesSneezing–––––12 pairsTestosteroneNeuro transmitter31 pairsNatural reflexC. ArteryD. Either X or Y chromosomeA. CapillaryC. 14th dayD. Age of the plant59
(f)(i)O – LeukemiaC – Hormonal / Endocrinal disorders(ii) O – PepsinC – Hormones(iii) O – PhotonC – Parts of neuron / nerve cell(iv) O – Chicken poxC – Genetic diseases(v) O – Polythene bagC – Biodegradable wastes(g)(i)(ii)(iii)(iv)(v)(h)(i) Water pollution/ Marine pollution(ii) Detergents, sewage, domestic waste, oil spills from tankers, industrial wastes, hot waterfrom thermal power plants, polythene covers, plastic bottles, dead bodies, insecticides,etc.(iii) Enters food chain to harm health, cause diseases like typhoid, dysentery, jaundice, skinallergies, etc.(iv) Treating industrial wastes and sewage before letting into water bodies, recycling plastic,metal and glass material(v) Any constituent that harms the environment / deteriorates the natural quality of air,water, soil.(Any alternate correct answer)Abscisic acidIndole 3-acetic acidAdenosine triphosphateDeoxyribo nucleic acidThyroid stimulating hormoneQuestion 2(a)Given below is an experimental setup to demonstrate a particular tropic movement ingerminating seeds. Study the diagram and answer the questions that follow:2Perforated troughMoist sawdustGerminating seed1Brick60[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?(b)Mention the exact location of the iotic fluid(v)Corpus callosum[5]Comments of Examiners(a) (i) Most of the candidates labelled the parts 1 and 2correctly. However, some candidates labelled theparts as, root and shoot, respectively.(ii) The tropic movement shown by part 1 wasnamed correctly by most candidates.(iii) Most candidates wrote the tropic movementsinstead of the stimuli.(iv) Most of the candidates answered this subpartcorrectly. However, some candidates wrote theexample of Nastic movements which wasincorrect.(v) Majority of the candidates answered correctly. Afew were unable to give a clear differentiationbetween the ‘Positive’ and ‘Negative’ tropicmovements in plants.(b) In sub-parts(ii)-(iv), most of the candidates wrote theexact location of the asked questions. However, insub-parts (i), and (v), many candidates could not givethe exact location. They wrote vague answers suchas, outside the abdomen in subpart (i) and in thebrain, in the cerebrum in subpart (v)61Suggestions for teachers- Give a simplified explanation ofTropic movements in plants.- Explain the difference betweenTropic movement and stimulus,Positive and negative tropicmovements.- Give suitable examples for tropicmovements.- Emphasise on the importance ofprepositions while teaching the exactlocation of organs and structures.- Clarify to the students the differencebetween radicle and root, plumule andshoot. corpus callosum and corpusluteum.
MARKING SCHEMEQuestion 2(a)(i)(ii)(iii)(iv)(v)(b)1. Radicle2. PlumuleHydrotropismGravity, water / moistureWater is strongerMovement of plant in response to touch stimulus.Pea, Vines, Cuscuta, cucumberMovement towards stimulus is positive.Movement away from stimulus is negative.(i) Inside scrotal sac(ii) Middle ear / between malleus and stapes(iii) In chloroplast(iv) Between amnion and foetus / surrounds the foetus(v) Between the cerebral hemispheres.Question 3(a)The diagram given below represents an experiment to prove the importance of a factorin photosynthesis. Answer the questions that follow:PaperBlack PaperClip(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.62[5]
(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 isreleased during photosynthesis.(b)State the main functions of the following:[5](i) Medulla Oblongata(ii) Cytokinins(iii) Tears(iv) Coronary Artery(v) Seminal VesiclesComments of Examiners(a)(i) Most candidates did not name the factor studied inthe asked experiment. They wrote the processinstead of the factor.(ii) Many candidates could not give a clear explanationof the starch test. They did not specify the colourchange in the covered and uncovered parts of theexperimental leaf.(iii) Majority of the candidates explained the process ofPhotosynthesis.(iv) Most candidates wrote the correct equation. A fewbalanced it by taking 6H 2 O instead of 12H 2 O.(v) Most candidates drew an incorrect diagram using amouse and bell jar instead of taking a hydrilla plantsubmerged in water.(b) (i) Few candidates stated the main function of MedullaOblongata correctly. Majority of them confused itwith the function of cerebellum.(ii) Most candidates answered correctly.(iii) This was correctly answered by most candidates.(iv) Most candidates wrote incomplete answers. Theydid not specify oxygenated blood.(v) Majority of the candidates wrote the correctanswer. A few wrote the function of testis insteadof seminal vesicles.63Suggestions for teachers- While teaching starch test inPhotosynthesis emphasise on thecolour change in the parts of theexperimental leaf.- Advise students to practice thechemicalequationforPhotosynthesis.- Guide students that any factor testedfor an experiment needs to be provedat the end. Hence, using a mouse andplant under a bell jar cannot proveduringthereleaseofO2photosynthesis since oxygen cannotbe tested. Instruct students to setupthe experiment using twigs ofhydrilla to prove the release ofoxygen.- Clarify the difference between thefactor and the process studied in anexperiment.- Ensure that students are clear aboutthe main functions of the structuresasked in the question paper.
MARKING SCHEMEQuestion 3(a)(i)Sunlight(ii)–Part of leaf covered by black paper turns brown, absence of starch.–Parts of leaf exposed to sunlight turns blue black, presence of starch.(iii)Plant cells having chlorophyll, use water and carbon dioxide to produce glucose in thepresence of sunlight.(iv) 6CO 2 12H 2 O(v)SunlightC 6 H 12 O 6 6H 2 O 6O 2SunlightChlorophyllOxygen gasWaterBubbles of oxygenHydrilla plant(b)(i) Regulates activities of internal organs like breathing, heartbeat, peristalsis.(ii) Stimulates cell division, plant growth, prevents ageing,expansion of cotyledons inseeds,breaks seed dormancy, promotes synthesis of chloroplasts, delays senescence.(iii) Lubricates surface of eye, washes away dust, kill germs, keeps surface of eye moist,lysozyme kills bacteria.(iv) Supplies oxygenated blood to the walls of the heart.(v) Activates sperms, forms a medium for transportation of sperms.64
Question 4(a)The diagram given below represents an organ system in the human body.[5]Study the same and answer the questions that follow:(i)Identify the system.(ii) Label the parts marked 2 and 4. Mention the function of part 5.(iii) Name the structural and functional units of the part marked 1.(iv) What is the fluid that accumulates in part 3?Which is the main nitrogenous waste present in it?(v) Draw a neat, labelled diagram showing the longitudinal section of part 1.(b)The diagram given below represents an endocrine gland in the human body. Study thediagram and answer the following questions:InfundibulumAnterior lobePosterior lobe(i)Identify the endocrine gland. Where is it located?(ii)Why is the above gland referred to as the ‘Master gland’?65[5]
(iii)Name the hormone which in deficiency causes Diabetes Insipidus.How does this disorder differ from Diabetes Mellitus?(iv)Explain the term ‘Hormone’.What is the role of Tropic hormones in the human body?(v)Which lobe of the above gland secretes:1.Oxytocin2.ACTH3.Growth hormoneComments of Examiners(a) (i) Most candidates identified the system correctly.‘Urinogenital system’ was written as an incorrectanswer by a few candidates.(ii) Most candidates labelled part 2 and 4 andmentioned the function of part 5 correctly.However, a few did not study the diagramcarefully and labelled part 4 as urethra.(iii) This part of the question was answered correctlyby most candidates.(iv) Majority of the candidates wrote the name of thefluid that accumulates in part 3 correctly.However, some candidates could not mention themain nitrogenous waste present in urine.(v) The longitudinal section of part 1 was drawncorrectly by most candidates. However, a fewcandidates could not show a clear differentiationbetween renal cortex and medulla.(b) (i) Most candidates identified the endocrine glandcorrectly. However, a large number of candidatescould not give the exact location of the gland.(ii) Most candidates answered this subpart correctly.(iii) This subpart was attempted well by mostcandidates.(iv) Majority of the candidates explained the term‘Hormone’ correctly but were unable to give therole of Tropic hormones in the human body.(v) Many candidates wrote incorrect answers as theywere uncertain of the hormones secreted by thetwo lobes of the Pituitary gland.66Suggestions for teachers- Familiarise students with the parts andfunctions of the Urinary system.- Encourage students to draw neat,labelled and accurate diagramsshowing all parts clearly.- Explain the location of the Pituitarygland with the help of asuitable/interactive board.- Interpret the differences between thetwo types of Diabetes with respect tohormones and symptoms. Also clarifythe keywords mellitus and insipidus.- Explain to the students the differencebetween an organ and an organsystem.- Give a list of organic and inorganicconstituents of urine.- Give a comparison of the fourendocrine glands, their secretion,disorders caused due to hyposecretionand hypersecretion.
MARKING SCHEMEQuestion 4(a)(i) Excretory system/Urinary system(ii)2 – Ureter4 – Sphincter5 – Expels urine(iii)Nephrons(iv)UrineUrea(v)(Any other correct labelling)(b)(i) Pituitary glandHangs from hypothalamus(ii) Controls the secretions of other endocrine glands/regulates the activities of otherendocrine glands.(iii) Vasopressin / ADHDiabetes mellitus is due to deficiency of insulin/ high level of sugar in blood, urine hassugar.Diabetes insipidus: Normal sugar in blood, urine free of sugar / urine loaded with water.(iv) It is the secretion of an endocrine gland, which is transported by blood and acts on targetorgans or cells.Secreted by pituitary gland and stimulates other endocrine glands to secrete theirhormones.(v)1 – Posterior/ neurohypophysis2 – Anterior / adenohypophysis3 – Anterior /adenohypophysis67
Question 5(a)Given below
BIOLOGY (PAPER-3 ) ICSE Class 10 Biology Question Paper Solution 2019. 55 (c) Give suitable biological reasons for the following statements: (i) The birth rate in India is very high. (ii) Carbon monoxide is
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