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ICSE-X-Biology

Previous Year Paper year:2019

with Solutions - page 2

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  • #1-c
    Give suitable biological reasons for the following statements :
    [5]
  • #1-c-i
    The birth rate in India is very high.
    Ans : 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.
  • #1-c-ii
    Carbon monoxide is dangerous when inhaled.
    Ans : 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.
  • #1-c-iii
    Root hairs become flaccid and droop when excess fertilizers are added to the moist soil around them.
    Ans : 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.
  • #1-c-iv
    Acid rain is harmful to the environment.
    Ans : 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.
  • #1-c-v
    All life on Earth is supported by Photosynthesis.
    Ans : Provides oxygen for respiration. Provides food and maintains food chain.
  • #1-d
    Match the items given in Column A with the most appropriate ones in Column B and rewrite the correct matching pairs.
    [5]


    Ans :
  • #1-e
    Choose the correct answer from the four options given below :
    [5]
  • #1-e-i
    While recording the pulse rate, where exactly does a doctor press on our wrist?

    A. Nerve

    B. Vein

    C. Artery

    D. Capillary

    Ans : C. Artery
  • #1-e-ii
    In a human male, a sperm will contain :

    A. Both X and Y chromosomes

    B. Only Y Chromosomes

    C. Only X chromosome

    D. Either X or Y Chromosomes

    Ans : A. Both X and Y chromosomes
  • #1-e-iii
    A muscular wall is absent in :

    A. Capillary

    B. Venule

    C. Arteriole

    D. Vein

    Ans : A. Capillary
  • #1-e-iv
    On which day of the menstrual cycle does ovulation take place ?

    A. 5th day

    B. 28th day

    C. 14th day

    D. 1st day

    Ans : C. 14th day
  • #1-e-v
    Which one of the following does not affect the rate of transpiration ?

    A. Light

    B. Humidity

    C. Wind

    D. Age of the plant

    Ans : D. Age of the plant
  • #1-f
    Identify the ODD term in each set and name the CATEG
    [5]

    Example: glucose, starch, cellulose, calcium, Odd term: calcium.
    Ans :
  • #1-f-i
    Addison’s disease, Cushing’s Syndrome, Acromegaly, Leukemia.
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