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

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ICSE-X-Biology

Previous Year Paper year:2011

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ICSE Board
Class X Biology
Board Paper 2011
(One hour and a half)
General Instructions: Total Marks: 80
1. Answers to this paper must be written on the paper provided separately.
2. You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the question paper.
3. The time given at the head of paper is the time allotted for writing the answers.
4. Attempt all questions from Section I and any four questions from Section II.
5. The intended marks of questions or parts of questions are given in brackets [ ].

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Section : I
Attempt all questions from this section.

#1

#1-a [5]
Name the following:

#1-a-i
The mineral element essential for the clotting of blood.
Ans : Calcium

#1-a-ii
The cells of the testes which produce the male hormones.
Ans : Interstitial cells

#1-a-iii
The nutritive layer of the eye which also prevents the reflection of light.
Ans : Choroid

#1-a-iv
The structural and functional unit of the kidney.
Ans : Nephron

#1-a-v
The part of the chloroplast where the light reaction of photosynthesis takes place.
Ans : Grana

#1-b [5]
State the main functions of the following:

#1-b-i
Yellow spot
Ans : Is the area of best vision as it has maximum no. of cone cells and perceieves image in the best manner.

#1-b-ii
Coronary artery
Ans : Supplies oxygenated blood to the walls of heart.

#1-b-iii
Medulla oblongata
Ans : Controls the involuntary activities of the body.

#1-b-iv
Thrombocytes
Ans : Helps in blood clotting by producing thromboplastio.

#1-b-v
Vitreous humour
Ans : Jelly like substance giving round shape to eye ball.