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ICSE-X-Biology

Previous Year Paper year:2012

with Solutions - page 9
 
  • #7-a-i
    Draw a well labelled diagram of a 'Neuron' and name the following parts
    (1) Node of Randier
    (2) Nissil granules
    (3) Cyton
    Ans : 15
  • #7-a-ii
    Name the part of the human brain which is concerned with the following :
    (1) Heat of memory (2) Coordinates muscular activity
    Ans : 1. Seat of Memory: Cerebrum.
    2. Co-ordinates muscular activity: Cerebellum.
  • #7-a-iii
    Mention any three major activities or the WHO.
    Ans : Activities of WHO:
    1. Set pharmaceutical standards.
    2. Suggests Quarantine measures.
    3. Finances research on various diseases.
    4. Suggests vaccinations against various diseases.
  • #7-b [5]
  • #7-b-i
    Draw a well labelled diagram to show the metopnase stage of Muosis in an animal cell ha ving four chromosomes.
    Ans : 16
  • #7-b-ii
    Mention any two reasons for the population explosion In INDIA.
    Ans : 1. Desire for a male child.
    2. Lack of awareness about birth control measures.
  • #7-b-iii
    Give biological reasons for the following:
    (1) Pituitary gland is also known as the master gland.
    (2) Gametes have a haploid number of chromosome.
    Ans : 1. Pituitary gland secretes homones that regulates all other endocrine glands so it is called the master gland.
    2. Gametes are produced by Meiosis in which the number of chromosomes gets reduced to half. So they are haploid.
    Also so that during fertilisation the zygote has diploid number of chromosomes.
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