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ICSE-X-Biology

Previous Year Paper year:2012

with Solutions - page 7
 
  • #5-b-v
    Give the possible combinations of gametes that can be obtained from F1 hybrid.
    Ans : F1 genotype: Rr Yy
    So possible gamete combinations are
    1. RY = Round yellow
    2. rY = Wrinkled yellow
    3. Ry = Round green
    4. ry = Wrinkled green
  • #6-a [5]
    The diagram below is an experiment conducted to study a factor necessary for Photosynthesis Observe the diagrams and then answer the following questions:
    12
  • #6-a-i
    What is the aim of the experiment ?
    Ans : To show that chlorophyll is necessary ku photosynthesis.
  • #6-a-ii
    Name the test performed on the leaf and the solution used for the test.
    Ans : Starch test.
    Solution used in Iodine solution.
  • #6-a-iii
    What type of leaf was used for the experiment ? Give an example.
    Ans : Variegated leaf/Coleus leaf (leaf having non green and green regions).
  • #6-a-iv
    What is the exported result of the above test on the parts labelled A and B ?
    Ans : After performing starch test,
    Part A turns blue black v/ith Iodine solution.
    Part B turns brown with Iodine solution Sunlight
  • #6-a-v
    Give a balanced chemical equation to represent the process of Photosynthesis.
    14
  • #6-b-i
    Identify the blood vessels A and B. In each case give a reason to support your answer.
    Ans : A - Artery, B - Vem
    A has narrow lumen and thick muscular wall
    B has wide lumen and thin muscular wall.
  • #6-b-ii
    Name the parts numbered 1 and 2.
    Ans : 1 - Endothelium
    2 - Lumen
  • #6-b-iii
    When are the sound .LUBB' and .DUP' produced during a heartbeat ? Name the blood vessel that :
    Ans : .LUBB': Sound is produced when the two aurieuioventricular valves shut.
    .DUP': Sound is produced when the two semilunar valves shut
  • #6-b-iv
    Name the blood vessel that:
    (1) begins and ends in capillaries
    (2) supplies blood tc the walls of the heart
    Ans : 1 Begins and ends in capillaries: .Hepatic porta Vein'.
    2. Supplies blood to the walls of the Heart: .Corunary artery'.
  • #7-a [5]
    Answer the following :
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