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ICSE-X-Biology

Previous Year Paper year:2016

with Solutions - page 3
 
  • #1-f-ii
    What are the two possible that cause this defect?
    Ans : 1. The eye ball is too long from front to back.
    2. The lens is too curved.
  • #1-f-iii
    Name the type of lens used to correct this defect.
    Ans : Concave lens
  • #1-f-iv
    With the help of a diagram show how the defect shown above is rectified
    using a suitable lens.
    Ans : 2
  • #1-g [5]
    Given in the box below are a set of 14 biological terms. Of these, 12 can be
    paired into 6 matching pairs. Out of the six pairs, one has been done for you
    as an example.
    Example : endosmosis - Turgid cell.
    Identify the remaining five matching pairs :
    Cushing.s syndrome, Turgid cell, Iris, Free of rod and cone cells, Colour of
    eyes, Hypoglycemia, Active transport, Acrosome, Addison.s disease, Blind
    spot, Hyperglycemia, Spermatozoa, Endosmosis, Clotting of blood.
    Ans : (i.) Hyperglycemia: Cushings syndrome
    (ii.) Hypoglycemia: Addison's disease.
    (iii.) Blind Spot: Free of rod cells and cone cells.
    (iv.) Iris: Colour of eyes.
    (v.) Acrosome: Spermatozoa.
  • #1-h [5]
    State the main function of the following :
  • #1-i
    Lymphocytes of blood
    Ans : Lymphocytes of blood: Produce antibodies.
  • #1-ii
    Leydig cells
    Ans : Leydig cells: Secrete male sex hormone testosterone.
  • #1-iii
    Guard cells
    Ans : Guard cells: Regulate the opening and closing of stomata in leaf to facilitate transpiration and exchange of gases.
  • #1-iv
    Eustachian tube
    Ans : Eustachian tube: Balance air pressure on either sides of the ear drum. So that ear drum can vibrate freely.
  • #1-v
    Corpus luteum
    Ans : Corpus luteum: Secretes hormones oesterogen, progesterone and relaxin.
  • # [40]
    Section : II
    Attempt any four questions from this Section
  • #2
  • #2-a [5]
    The figure given below is a diagrammatic representation of a part of the
    cross section of the root in the root hair zone. Study the same and then
    answer the questions that follow :
  • #2-a-i
    Name the parts indicated by the guidelines 1 to 4.
    Ans : 1. Root hair 2. Soil water 3. Xylem Vessels 4. Cortical cells.
  • #2-a-ii
    Which is the process that enables the passage of water from the soil into
    the root hair?
    Ans : Osmosis Process
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