ICSE Board 2019 fully solved Biology (Science Paper-3) Question Paper


In this article, I am giving solutions to all questions of ICSE Board's latest March 2019 Biology question paper. These solutions will give the students to know the pattern of answering as well as to prepare themselves for their upcoming Board's exams. Students can get benefited by revising these questions which will help them to improve their skills in answering questions.

Solutions to all the questions of ICSE Board's 2019 paper were given below. Question paper of the Board was given as an attachment here: ICSE Board 2019 Biology (Science-3) Question Paper

Section I (40 Marks)


Question 1


  1. Name the following:

    1. Choroid
    2. Chlorofluorocarbons
    3. Umbilical cord
    4. Homologous chromosomes
    5. Carbamino haemoglobin

  2. Correct and rewrite the statements by changing the biological term that is underlined for each statement:-
    1. The theory of Inheritance of Acquired Characters was proposed by Jean Baptiste Lamarck.

    2. The protective sac which develops around the developing embryo is called the Amnion.

    3. Maintaining balance of the body and coordinating muscular activities is carried out by Cerebellum

    4. The kidney is composed of number of Nephrons

    5. The part of the eye which can be donated from a clinically dead person is the Cornea.

  3. Give suitable biological reasons for the following statements:-
    1. The birth rate in India is very high.
      Ans. The birth rate in India is very high because of illiteracy among the people, religious beliefs, desire for a male child in the family, etc.

    2. Carbon monoxide is dangerous when inhaled.
      Ans. Carbon monoxide is dangerous when inhaled because of Carbon monoxide forms a stable compound with hemoglobin which deprives the oxygen carrying capacity of hemoglobin.

    3. Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them.
      Ans. Root hairs become flaccid and droop because of root hairs lose water to outside concentrated fertilizer solution by exosmosis.

    4. Acid rain is harmful to the environment.
      Ans. Acid rain is harmful to the environment because of acid rains damage to aquatic life, damage monuments, destroy crops, etc

    5. All life on Earth is supported by Photosynthesis.
      Ans. All life on Earth is supported by Photosynthesis because green plants prepare food by photosynthesis and provide food to all living beings either directly or indirectly.

  4. Match the terms from Column A with Column B:-

    1. Cranial nerves ------------>12 pairs

    2. Leydig cells --------------->Testosterone

    3. Acetylcholine--------------->Neurotransmitter

    4. Spinal nerves--------------->31 pairs

    5. Sneezing------------------->Natural reflex

  5. Choose the correct answer from the four options given below;-
    1. C. Artery
    2. D. Either X or Y chromosome
    3. A.Capillary
    4. C.14 th day
    5. D.Age of the plant

  6. Choose the Odd one out of the following terms given and name the Category to which other belong:-
    1. Odd one:-Leukemia; Category:-Defects of hormonaql imbalance

    2. Odd one:-Pepsin; Category:-Hormones

    3. Odd one:-Photon; Category:-Parts of neuron

    4. Odd one:-Chicken pox; Category:-Heriditary diseases

    5. Odd one:-Polythene bag; Category:-Biodegradable wastes

  7. Expand the following abbreviations:-
    1. ABA:- Abscisic Acid

    2. IAA:- Indolyl Acetic Acid

    3. ATP:- Adenosine triphosphate

    4. DNA:- De-oxy Ribo Nucleic acid

    5. TSH:- Thyroid Stimulating Hormone

  8. Study the picture given below and answer the following questions:-
    1. Water Pollution

    2. Mercury

    3. Causes Minimata disease

    4. Industrial pollutants should not be let into water bodies

    5. Any substance which cause pollution is known as pollutant.

    Here is the solutions for ICSE Board's 2017 fully solved Biology (Science Paper-3) question Paper

    Section-II (40 Marks)


    Question 2


    1. Diagram based question:-
      1. Radicle (root), Plumule (shoot)

      2. Hydrotropic movement

      3. Geotropic movement and Hydrotropic movement. Here is the hydrotropic movement is the strongest.

      4. Movement of plant parts towards physical contact. Ex:- Tendrils of a plant curling around support

      5. Growing a plant part towards a stimulus is positive tropic movement and growing a plant part away from stimulus negative tropic movement.

    2. Mention the exact location of the following:-
      1. Testis:- Extra abdominal lodged in scrotal sacs

      2. Incus:-Middle ear

      3. Thylakoids:-In the stroma of chloroplast

      4. Amniotic fluid:-Inside the amnion and around foetus

      5. Corpous Callosum:-present between right and left cerebral hemispheres

    Question 3


    1. Diagram based question:-
      1. Sunlight is necessary for photosynthesis

      2. Part of the leaf covered with black paper turns brown and the part exposed Sunlight into blue-black

      3. Photosynthesis is the process by which green plant produce their food with the help of chlorophyll, CO2, water and Sunlight.

      4. 6CO2 + 12H2O -----------------> C6H12O6 + 6H2O + 6O2 (Chlorophyll above the arrow and Sunlight below the arrow).

      5. An experimental setup to show oxygen evolved during Photosynthesis
        An experimental setup to show oxygen evolved during Photosynthesis (Courtesy:-Image taken from 2010 ICSE Board's old question paper)

    2. State the main function of the following:-
      1. Medulla oblongata:- Control involuntary activities of the body.

      2. Cytokinins:-Plant hormone helps in cell divisions and growth.

      3. Tears:-Contain an anti-bactericidal enzyme lysozyme which kills the germs present on the surface of the eyeball/cleans the surface of eyeball from dust and germs.

      4. Coronary artery:-It supply oxygenated blood to the wall of the heart.

      5. Seminal vescicles:-Secrete an alkaline secretion which nourish and mature sperms

    Question 4


    1. Diagram based question:-
      1. Excretory system

      2. Part 2 is Ureter and Part 4 is Sphincter. Function of part 5 is micturition.

      3. Nephrons/kidney tubules/uriniferous tubules.

      4. Urine. The main nitrogenous waste is urea.

      5. Longitudinal Section of Kidney:-
        Longitudinal section of Kidney:-
        (Courtesy:-Image taken from 2015 ICSE Board's old question paper)

        Part 1. Outer cortex, 2. Inner medulla, 3. Renal pelvis, 5.ureter

    2. Diagram based question:-
      1. It is Pituitary gland. It hangs from the base of mid-brain below hypothalamus.

      2. Pituitary gland is known as Master gland because the secretions of the pituitary gland will control the secretions of other endocrine glands.

      3. Hyposecretion of Vasopressin or ADH hormone from the posterior lobe of pituitary will cause Diabetes insipidus. In Diabetes insipidus, frequent urination occurs with excess loss of water. But in Diabetes insipidus, frequent urination occurs with the loss of glucose. This disorder occurs due to hyposecretion of insulin from pancreas.

      4. A hormone is a chemical messenger which is secreted at one part of our body and it will have its influence at some other parts of the body.
        Tropic hormones are the hormones which stimulate the secretions of some other endocrine glands. For example, Thyroid Stimulating Hormone (TSH) secreted by the Pituitary gland will stimulate the secretion of Thyroid gland.

      5. Oxytocin:-This hormone secreted from the posterior lobe of the pituitary.
        ACTH:-This hormone secreted from the anterior lobe of the pituitary.
        Growth hormone:-This hormone is secreted from the anterior lobe of pituitary.

    Question 5


    1. Diagram based question:-
      1. Transpiration.
        Transpiration:-The evaporative loss of water through the aerial parts of the plant is known as transpiration.

      2. The pot enclosed in a rubber sheet to prevent the escape of water vapor from the moist soil into bell jar.

      3. The two external factors which accelerate the transpiration is wind velocity/high temperature/dry atmosphere.

      4. Presence of thick cuticle over the surface of leaves/loss of leaves/narrow leaves/sunken stomata

      5. Stomatal Apparatus (Open and Closed) diagram:-
        Stomatal Apparatus
        (Image by author)

      1. A. Neanderthal man; B. Australopithecus.

      2. Australopithecus men:-Chin was absent/eyebrow ridges projected over the eyes.
        Neanderthal man:-large forehead/prominent brow ridges/less hair on the body.

      3. The theory of Natural Selection was proposed by Charles Darwin.

      4. The organism mentioned in relation to industrial melanism is moth Biston betularia

      5. Two examples of vestigial organs:-Vermiform appendix, a finger-like projection present between the small intestine and large intestine/ wisdom teeth in humans/Pinna in humans

    Question 6


    1. Question on Mendel's experiment:-
      1. In F1 generation all the plants obtained are phenotypically are Tall and genotypically are mixed tall (Tt).

      2. Punnet Square board:-
        Punnet square Board:-

      3. Phenotypic ratio:- 3(Tall) : 1(Dwarf)
        Genotypic ratio:- 1 : 2 : 1

      4. Law of dominance:-Every character is influenced by a pair of factors. Of the two factors, the factor that get expressed is said to be dominant and the factor that get suppressed is said to be recessive. This is known as the law of dominance.

      5. A cross made between two parent plants taking into account two pairs of contrasting features at a time.

    2. Diagram based question:-
      1. The stage shown in the diagram is Anaphase. The reason for this is, the chromatids of each chromosome is moving towards the opposite poles of the cell.

      2. It is an animal cell. The reason is asters are found in the cell/cell wall is absent

      3. Telophase Stage in Mitosis:-
        Telophase Stage of Mitosis
        (Image by author)

      4. Each cell will have 4 chromosomes after cell division.

      5. The four nitrogenous bases are Adenine, Thymine, Guanine, Cytosine.

    Here is the solutions for ICSE Board 2018 fully solved Biology (Science Paper-3) Question Paper

    Question 7


    1. Answer the following questions:-
      1. In brain, the cytons of the neurons which form the grey matter is situated in the outer region but in the spinal cord the cytons are arranged in the inner region.
        The axons of the neurons which form the white matter are situated in the inner region but in the spinal cord in the outer region.

      2. Dynamic balance of human ear is balanced by ampullae of semicircular canals. Static balance is maintained by sacculus and utriculus of semicircular canals.

      3. Light adaptation:-Adjustment of our eyes to see objects in bright light is known as light adaptation. When we move from dark area bright light, rods present in the retina get bleached and cones start functioning. Next, the size of the pupil becomes constricted as you are seeing the object in the bright light. These two changes are required to see objects in bright light.
        Dark adaptation:-When we enter from bright light to dark area, the cones stop functioning and the rods generate rhodopsin pigment. Similarly, the size of the people gets dilated as we are seeing the object in the darkroom.

      4. Development of fruits without the act of fertilization is known as Parthenocarpy. Ex:-Banana fruits are formed without the act of fertilization. Seedless grapes and watermelons are produced through induced parthenocarpy.

      5. Objectives of Swachh Bharat Abhiyan:-Elimination of open defecation/Eradication of manual scavenging/promoting modern solid waste management

      1. Human Female reproductive system

      2. Part 5 is Oviducal funnel/Funnel of the oviduct and part 6 is cervix

      3. Oestrogen and Progesterone

      4. Part involved in fertilization is oviduct and the part involved implantaion is endometrium region of uterine wall.

      5. Surgical method followed in human male is Vasectomy and in female is Tubectomy.


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