Previous Year Paper year:2011 : ICSE-X-Biology

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ICSE-X-Biology

Previous Year Paper year:2011

with Solutions - page 5

#3-a-vi
Where in the body is the pancreas located?
Ans : In the abdomen in the loop of small intestine close to duodenum part of small intestine.

#3-b
With reference to the functioning of the eye, answer the following questions:

#3-b-i
What is power of accommodation of the eye?
Ans : The alteraction in thickness of lens that enables us to see objects at varying distances is called accomodation.

#3-b-ii
What is the shape of the lens during
.(1) near vision and (2) distant vision?
Ans : 1. During near vision the shape of the lens is more convex or rounded.
2. During distant vision the shape of the lens is less convex or flat.

#3-b-iii
Name the two structures in the eye responsible for bringing about the change in
the shape of the lens.
Ans : Ciliary muscles and suspensory ligament.

#3-b-iv
Name the cells of the retina and their respective pigments which get activated (1)
in dark and (2) in light.
Ans : 1. In the dark - The cells are rods in pigment is rhodopsin.
2. In the light - The cells are cones the pigment is lodopsin.

#4 [10]

#4-a
The diagram below shows the human circulatory system. Answer the following
questions:

#4-a-i
Name the blood vessels 1, 3, 6 and 7.
Ans : 1 - Pulmonary vein,
3 - Hepatic portal vein,
6 - Hepatic vein
7 - Posterior vena cava.

#4-a-ii
Name the blood vessel supplying blood to the walls of the heart with oxygen.
Ans : Coronary artery

#4-a-iii
Draw a neat labeled diagram of blood vessel '2' as seen in a cross-section.
Ans :

#4-a-iv
Mention one structural difference between blood vessels numbered 4 and 5.
Ans :

4 (Renal artery) 5 (Renal vein)

1. Thick muscular wall
2. Narrow lumen
3. Valves absent
Thin muscular wall
Wide lumen
Valves present

#4-b
With reference to the human ear, answer the following questions:

#4-b-i
Give the technical term for the structure found in the inner ear.
Ans : Membranous labyrinth

#4-b-ii
Name the three small bones present in the middle ear. What is the biological term
for them collectively?
Ans : Hammer anvil and stirrup or Malleus incus and stapes
Collectively called Ear ossicles.