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ICSE-X-Biology

Previous Year Paper year:2016

with Solutions - page 4
 
  • #2-a-iii
    Name the pressure that is responsible for the movement of water in the
    direction indicated by the arrows. Define it.
    Ans : Osmotic pressure: The pressure exerted by a solution to prevent the entry of water molecules, through the semi -permeable membrane is called Osmotic pressure.
  • #2-a-iv
    Due to an excess of this pressure sometimes drops of water are found
    along the leaf margins of some plants especially in the early mornings.
    What is the phenomenon called?
    Ans : Guttation.
  • #2-a-v
    Draw a well labelled diagram of the root hair cell as it would appear if an
    excess of fertiliser is added to the soil close to it.
    Ans : 4
  • #2-b [5]
    Differentiate between the following pairs on the basis of what is mentioned
    within brackets :
  • #2-b-i
    Human skin cell and Human ovum (number of chromosomes).
    Ans : Human skin cell: 46 Chromosomes
    Human ovum: 23 Chromosomes
  • #2-b-ii
    Sperm duct and fallopian rube (function)
    Ans : Sperm Duct: Transfer mature sperm from testis for release. Fallopian Tube : Site of fertilisation in human female.
  • #2-b-iii
    Red Cross and WHO (one activity)
    Ans : Red Cross: Supply blood to victims of war.
    WHO: Set, pharmaceutical standards.
  • #2-b-iv
    Rod cells and cone cells (pigment)
    Ans : Rod cells: Rhodopsin
    Cone cells: Iodopsin
  • #2-b-v
    LUBB and DUP (names of the valves whose closure produce the sound)
    Ans : LUBB: Atrioventricular valves
    DUP: Semilunar valves.
  • #3
  • #3-a [5]
    Given below is the outline of the human body showing the important glands :
  • #3-a-i
    Name the glands marked 1 to 4.
    Ans : 1. Pituitary gland.
    2. Thyroid gland
    3. Pancreas
    4. Adrenal gland
  • #3-a-ii
    Name the hormone secreted by part 2. Give one important function of
    this hormone.
    Ans : Thyroxine. It regulates basal metabolism of the body.
  • #3-a-iii
    Name the endocrine part of the numbered 3.
    Ans : Islets of Langerhans.
  • #3-a-iv
    Why is the part labelled I called the master gland? Which part of the
    forebrain controls the gland labelled I?
    Ans : Because it controls the secretions of all the other endocrine gland. Hypothalamus controls it.
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