ICSE Board's 2017 Biology (Science-3) Question Paper Key and Solutions

In this resource, solutions for all the questions of ICSE Board's 2017 Biology Paper were given. This will help the students to learn the technique of writing the answers in a proper and correct way with using exact key words. Duration to answer the Board's question paper is two hours. Forty marks were allotted to Section I (Objective type) and Forty marks were allotted to Section II (Descriptive type). Some suggestions were given along with the answers which help the student to avoid mistakes.

In this resource, solutions were provided to all the questions (both objective type and descriptive answer type questions) of 2017 ICSE Board's Biology Paper. This will be helpful for the students who are appearing for the forth coming Board's exam in their preparation. Students can get 2017 Board's original Biology question paper in pdf. format from here: ICSE Biology 2017 Question Paper and
ICSE Biology 2017 Question Paper (Continued)

Section-I (40 Marks)

Question 1

  1. Name the following:-(Write answers only and there is no need to write the questions. Don't give two answers for the question and if you write two different answers (one correct and one wrong) you will loose your mark for the question).

    1. Osmosis
    2. Liver
    3. Concave lens
    4. Oxytocin
    5. Red Cross

  2. Choose the correct option;-

    1. D. Refrigeration equipment
    2. A. Antibiotic
    3. A. Endosmosis
    4. D. Oviduct
    5. C. DNA

  3. Rewrite the correct statement:-(Candidates have to change the underlined wrong words of the statement only but not the other words of the statement).

    1. The Graafian follicle, after ovulation turns into a hormone producing tissue called Corpous luteum,
    2. Deafness is caused due to rupturing of tympanum
    3. Gyri and Sulci are folds of Cerebrum
    4. Free movement of solutes in and out of the cell takes place across the Cell wall
    5. The solvent used to dissolve the chlorophyll pigments while testing a leaf for starch is Methyl alcohol,

  4. Rewrite the terms in correct order in a logical sequence:-

    1. Platelets----->Thromboplastin------>Thrombin------->Fibrinogen-------->Fibrin
    2. Pinna-------->Malleus-------->Incus-------->Stapes------->Cochlea

    3. Receptor--------->Sensory neuron------->Spinal cord------->Motor neuron------->Effector
    4. Uterus-------->Fertilization-------->Implantation--------->Gestation--------->Parturition

    5. Green leaves------>Caterpillar------->Frog------>Snake------->Owl

  5. Choose the Odd one out of the following terms given and name the Category to which other belong:-

    1. Aqueous humour, Vitreous humour, Iris, Central canal
      Ans. Odd:-Central canal
      Category:-Parts of eye

    2. Formalin, Iodine, DDT, Lime
      Ans. Odd:- Iodine
      Category:- Disinfectant

    3. ACTH, TSH, ADH, FSH
      Ans. Odd:- ADH
      Category:- Hormones secreted by Anterior Pituitary

    4. Phosphate, RNA, Sugar, Nitrogenous base
      Ans. Odd:- RNA
      Category:- Components of a nucleotide

    5. Bile, Urea, Uric acid, Ammonia
      Ans. Odd:- Bile
      Category:- Nitrogenous metabolic wastes excreted through kidneys

  6. Given below are groups of terms. In each group the first pair indicates the relationship between two terms. Rewrite and complete the second pair on a similar basis.

    1. Eye : Optic Nerve : : Ear : Auditory nerve

    2. Cytoplasm : Cytokinesis : : Nucleus : Karyokinesis

    3. TT : Homozygous : : Tt : Heterozygous

    4. Foetus : Amnion : : Heart : Pericardium

    5. Adenine : Thymine : : Cytosine : Guanine

  7. Match the items given in Column A with Column B:-

    1. Sacculus ---------------> Static body balance

    2. Birth rate --------------> Natality

    3. DNA and Histones------>Nucleosomes

    4. Euro norms--------------->Vehicular standards

    5. Diabetis mellitus---------->Hyperglycemia

  8. The diagram given below represents the location and structure of an endocrine gland. Study the same and answer the questions that follow:-

    1. Thyroid gland

    2. Thyroxine

    3. Iodine

    4. Cretinism

    5. Exophthalmic Goitre

Here is ICSE Board's 2016 Biology (Science-3) solved question Paper

Section-II (40 Marks)

Question 2

  1. Diagram based question:-
    1. Telophase.
      Reasons:- Two sets of daughter chromosomes reached opposite poles, spindle fib-res disappeared, nuclear membrane and nucleolus reappeared and chromatids thinned out.

    2. Part numbered 1 is daughter chromosome, part numbered 2 is Nuclear membrane.

    3. Karyokinesis

    4. Anaphase

    5. Anaphase Stage
      Anaphase Stage (Courtesy:-www.wikispaces.com)

    6. Meiosis

    Study about above Mitosis process from here:-How Mitosis Process occurs in an Animal cell?

  2. Differentiate between the following pairs of terms:-
    1. Active Transport and Diffusion (Significance in Plants)
      Ans. Through active transport the uptake of mineral ions against concentration gradient occurs from soil solution to root hair cells.
      The movement of mineral ions from soil solution from high to low concentration into root hairs is by diffusion method i.e by passive absorption.

    2. Demography and Population density (Definition)
      Ans. Demography:- The statistical study of human population is known as Demography.
      Population density:- The number of people living in a square kilometer area at any given time is known as Population Density.

    3. Antibiotic and Antibody source (Source)
      Ans. Antibiotics are chemical substances extracted from microorganisms to kill or inhibit disease causing germs.
      Antibodies are chemically proteins which are produced by our immune system i.e. WBC induced by germs (antigens) or foreign substance.

    4. Renal cortex and Renal medulla (Parts of nephrons present)
      Ans. In Renal cortex, the parts of the nephron Malphigian corpuscles, Proximal convoluted tubule and distal convoluted tubule.
      In Renal medulla, Henleys loops and collecting ducts are present in it.

    5. NADP and ATP (Expand abbreviation)
      Ans. NADP:- Nicotinamide Adenine Dinucleotide Phosphate
      ATP:- Adenosine Triphosphate

Question 3

  1. Diagram based question:-
    1. Plasmolysed state.

    2. Plasma membrane

      1. Cell wall
      2. Empty space filled with strong sugar solution
      3. Cell membrane
      4. Nucleus

    3. We can brought back the cell to the original condition by keeping the cell in normal water. Scientific term for the recovery of the cell is deplasmolysis.

    4. Presence of Cell wall and presence of large vacuole are the two features found only in Plant cell.

    1. Sound Pollution

    2. Industrial machines, Jet air crafts landing and leaving, automobiles, trains etc.

      1. It lowers efficiency of work

      2. It interferes communication

      3. It interferes concentration of thought and peace of mind

    3. Pollutant is any such constituent which cause pollution.

    4. Pesticides, Polythene bags and plastic material

Question 4

  1. Experimental based question:-
    1. Respiration

    2. Respiration is a chemical process in which food molecules are oxidized to release energy for the various vital activities of the cell. The energy released in this process are in the form of a chemical compound ATP which will be stored in the mitochondria of the cells. To carry various life activities of the cell, the energy stored in ATP will be utilized.

    3. In Bell Jar B Mouse died because all the oxygen present in the Bell jar is utilized for the burning of the candle.

    4. All the organisms present on earth due to respiration give out Carbon dioxide. This Carbon dioxide will be utilized by green plants in Photosynthesis for preparing their food. The green plants in exchange to Carbon dioxide are giving out Oxygen for all living beings to breath.

    5. C6H12O6 + 6 O2 -------------->6 O2 + 6 H20 + 38 ATP

  2. Mention exact location of the following:-
    1. Prostrate gland:- Present around the urethra below Seminal vesicle

    2. Myelin sheath:-It is an insulating covering present around axon

    3. Islets of Langerhans:- Present in the tissue of pancreas gland

    4. Semi-circular canals:- Present in the inner ear besides Cochlea

    5. Eustachian tube:- A tube which connects nasopharynx to the middle ear.

Question 5

  1. Diagram based question:-
      1. Scrotal sac
      2. Vas deferens or Sperm duct
      3. hind part of epididymis

    1. Seminiferous tubules

      1. Scrotal sac:- It maintains 2-3 degrees less temperature to testis so that motile sperms are produced

      2. Vas deferens:- It carries sperms from testis to urethra

      3. Epididymis:- It is the region where immature sperms get stored and matured

    2. Leydig cells or Interstitial cells

    3. Structure of a human Sperm cell diagram:-
      Structure of a Human Sperm cell
      Structure of a Human Sperm cell (Courtesy:- www.wikimedia.org)

  2. Give Biological reasons for the following:-
    1. Some women have facial hair like beard and mustache
      Ans. This is because of the overgrowth of Adrenal cortex in a mature female and over secretion of sex corticoid hormones leads to the development of male features in female.

    2. Cutting of trees should be discouraged
      Ans. Trees provide the earth with Oxygen and will take in Carbon dioxide for their Photosynthesis. Trees provide us rains and stop soil erosion.

    3. In some xerophytes leaves are modified into spines
      Ans. Leaves of plants loose water by transpiration through evaporation from their surfaces. But in Xerophytes the leaves are modified into spines so that they minimize the loss of water through transpiration.

    4. There is frequent urination in water than in summer
      Ans. In summer we loose much water in the form of sweat and so less water is available for the formation of urine. So the quantity of urine produced is less and is thick in concentration. But in winter we perspire less and so more water is available for the formation of urine. So the quantity of urine produced is more and thin in concentration.

    5. The left ventricle of the heart has a thicker wall than the right ventricle
      Ans. This is because the left ventricle has to push the blood to far off places from the tip of the head to the tip of the toe. So the thick muscular left ventricle has to apply much force to push the blood to far off places. But the right ventricle has to push the blood to very near by place to lungs and so it is less thick.

Question 6

  1. Diagram based question:-
    1. Ventricles are in diastolic phase. Reason- Tricuspid and Bicuspid valves are opened but semilunar valves present at the base of Pulmonary artery and aorta are closed.

    2. Part 1 is Pulmonary artery carry de-oxygenated blood to left lung purification part 2 is Pulmonary veins which carry oxygenated blood to left auricle.

    3. LUBB sound is heard when bicuspid and tricuspid valves get closed sharply at the start of ventricular systole. DUP sound is heard when the semilunar valves get closed at the base of aorta and pulmonary artery get closed shaply at the beginning of ventricular diastole.

    4. The blood vessels which supply oxygenated blood to heart muscles are Coronary arteries.

    5. T.S. of an artey and vein:-
      T.S. of Artery and Vein structure
      T.S. of an artey and vein (Courtesy:- www.wikispace.com)

  2. Give appropriate biological/technical term for the following:-
    1. Innate immunity
    2. Recessive allele
    3. Seminal vesicles
    4. Manometer
    5. Fraternal twins
    6. Homologous chromosomes
    7. Antiseptic
    8. Biomedical wastes
    9. Lysozyme
    10. RBC

Question 7

  1. In a homozygous pea plant, axial flowers (A) are dominant over terminal flowers (a).

    1. Cross between homozygous dominant and recessive plants
      Cross between homozygous dominant (Axial Flowers) and recessive plants (Terminal Flowers)
      Phenotypically all the plants of F1 generation are heterozygous dominant. Genotypically all the plants of F1 generation are mixed Axial flower plants i.e. (Aa).

    2. Punnet Checker Board for a cross between both the parents heterozygous for Axial flowers (Aa):-
      Cross between two heterozygous Axial Flower Plants
      Cross between two heterozygous Axial Flower (Aa) Plants

    3. Phenotypic ratio:- 3 : 1; Genotypic ratio : 1 : 2 : 1

    4. Law of Dominance:- Every character is influenced by a pair factors. Of these two factors, the dominant factor gets expressed and recessive factor get suppressed. This is known as Law of Dominance

    5. Baldness, Colour blindness, Haemophilia, Hypertrichosis

  2. Diagram based question:-
    1. Part A is Cerebrum; Part B is Cerebellum; Part C is Medulla oblongata

    2. Cerebrum:- It is the seat for intelligence, thinking, reasoning, solving, inventing, memorizing, recollecting and control all voluntary activities.

      Cerebellum:- It maintains the balance of the body and co-ordinates muscular activities.

    3. The structural and functional units of brain are neurons.

      In Cerebrum, the Cell bodies of neurons are situated in the outer portion (Cortex) of brain and axons of neurons are situated in the inner portion (Medulla) of brain.

      In Medulla oblongata, the outer Cortex contains axons of neurons and inner portion contain Cell bodies of neurons.

    4. The collective term for the membranes covering the brain is Meninges

    5. Cerebrospinal fluid protects the brain and spinal cord from sudden mechanical shocks and jerks.


Guest Author: Raj Nair06 Dec 2017

In Q.4 I think the process should be photosynthesis, because of following reasons:-
1. The response is not in the syllabus.
2. If the plant respires, O2 will be absorbed and the rat will definitely die.
3. Sunlight is required for photosynthesis and not for respiration.

Guest Author: Smita08 Dec 2017

Q4 - Answer is incorrect.
Q6biv- Ganong's photometer is the answer.
Q7ai- Phenotype is all axial flower and Genotype is heterozygous dominant.
Q7bi- C is spinal cord.

Guest Author: Aman06 Jan 2018

Sorry to inform that
Question no 4 (a) answer is totally wrong
Physiological process is photosynthesis not respiration
Please refer


Guest Author: A student13 Jan 2018

In Question 4

The process is photosynthesis
As we don't have respiration in the 10th syllabus.

Please change the answer.

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