Previous Year Paper year:2016 : ICSE-X-Biology

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ICSE-X-Biology

Previous Year Paper year:2016

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#
ICSE Board
Class X Biology
Board Paper 2016
(Two hours)
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 the paper is the time allowed 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 [ ].

# [40]
Section : I
Attempt all questions from this Section

#1

#1-a [5]
Name the following:

#1-a-i
The exchange of chromatid parts between the maternal and the paternal
chromatids of a pair of homologous chromosomes during meiosis.
Ans : Crossing over

#1-a-ii
The number of individuals inhabiting per unit area.
Ans : Population density

#1-a-iii
The immunity acquired by providing readymade antibodies from outside
for treating certain infectious diseases.
Ans : Passive immunity

#1-a-iv
The pollutants that cannot be broken down to simple and harmless
products.
Ans : Non biodegradable

#1-a-v
The part of the brain that carries impulses from one hemisphere of the
cerebellum to the other.
Ans : Pons varoli

#1-b [5]
Choose the correct answer from each of the four options given below:

#1-b-i
A plant cell may burst when:
A. Turgor pressure equalises wall pressure.
B. Turgor pressure exceeds wall pressure.
C. Wall pressure exceeds turgor pressure.
D. None of the above
Ans : (B) Turgor pressure exceeds wall pressure.

#1-b-ii
The individual flattened stacks of membranous structures inside the
chloroplasts are known as :
A. Grana
B. Stroma
C. Thylakoids
D. Cristae
Ans : (C) Thylakoids

#1-b-iii
The nephrons discharge their urine at the :
A. Urinary bladder
B. Urethra
C. Renal pelvis
D. Renal pyramid
Ans : (C) Renal pelvis

#1-b-iv
Gigantism and Acromegaly are due to :
A. Hyposecretion of Thyroxine
B. Hyposecretion of Growth hormone
C. Hypersecretion of Thyroxine
D. Hypersecretion of Growth hormone
Ans : (D) Hypersecretion of Growth hormone

#1-b-v
The mineral ion needed for the formation of blood clot is :
A. Potassium
B. Sodium
C. Calcium
D. Iron
Ans : (C) Calcium