Previous Year Paper year:2009 : ICSE-X-Biology

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ICSE-X-Biology

Previous Year Paper year:2009

with Solutions - page 4

#1-i
The cerebral hemispheres in mammals are connected by the
.(i) Corpus luteum
.(ii) Hypothalamus
.(iii) Pons varolii
.(iv) Corpus callosum
Ans : (iv) Corpus callosum.

#1-ii
Insulin is secreted by the
.(i) Beta cells of the pancreas
.(ii) Alpha cells of the pancreas
.(iii) Delta cells of the pancreas
.(iv) None of the above
Ans : (i) Beta cells of pancreas.

#1-iii
A destarched plant is one whose
.(i) Leaves are free from chlorophyll
.(ii) Aerial parts are free from starch
.(iii) Leaves are free from starch
.(iv) Plant is free from starch
Ans : (i) Leaves are free from chlorophyll.

#1-iv
The onset of menstruation in a female is termed
.(i) Ovulation
.(ii) Menarche
.(iii) Menopause
.(iv) Parthenogenesis
Ans : (ii) Menarche.

#1-v
BCG vaccine provides immunity against
.(i) Tetanus
.(ii) Cholera
.(iii) Tuberculosis
.(iv) AIDS
Ans : (iii) Tuberculosis.

# [40]
Section : II
Attempt any four questions from this section.

#2

#2-a [5]
The diagram below represents a stage in cell division. Study the same and
answer the questions which follow:

#2-a-i
Identify the stage of cell division.
Ans : Anaphase.

#2-a-ii
Name the parts labelled A, B, C and D.
Ans : Part A = Spindle Fiber
Part B = Cell wall
Part C = Chromatid
Part D = Centromere

#2-a-iii
What is the unique feature observed in this stage?
Ans : Unique feature of this stage : Chromosome are divide into two parts and chromatids are separated which moves towards opposite pole.

#2-a-iv
Where does this type of cell division usually occur?
Ans : Somatic cells.

#2-a-v
How many daughter cells are formed from this type of cell division?
Ans : Two daughter cells are formed from this kind of cell division.

#2-a-vi
Is the dividing cell shown a plant or an animal cell? Give a reason to support your
answer.
Ans : Dividing cell shown here is a plant cell because cell wall is clearly visible here which is a unique feature of the plant cells.

#2-b [5]
The diagram below represents a structure found in a leaf. Study the same and answer
the questions which follow: