CBSE SAMPLE PAPER: 2010
SUBJECT: BIOLOGY (Theory)
Candidates must write the Code on the title page of the answer-book.
Please check this question paper contains 6 printed pages.
Please check this question paper contains 30 questions.
Please write down the Serial Number of the question before attempting it.
15 minutes time has been allotted to read this question paper
. The student will read the
question paper only and will not write any answer during this period.
Time: 3 hours
All questions are compulsory.
This question paper consists of four Sections A
. Section A
questions of one
mark each, Section B
is of 10 questions of two
marks each, Section C
is of 9 questions of three
marks each and Section D
is of 3 questions of five
There is no overall choice. However, an internal choice has been provided in one
question of 2
marks, one question of 3
marks and all the three questions of 5
weightage. A student has to attempt only one of the alternatives in such questions.
Wherever necessary, the diagrams drawn should be neat and properly labelled.
Section – A
Why do you think that the offspring‟s of bony fish are extremely vulnerable to
Mention the external opening of the Urethera.
How does incomplete dominance differ from co-dominance?
Mention the information found/gathered during HGP, which promises to revolutionize
the process of tracing human history etc.
„In the case of tetanus, the patient is injected readymade (preformed) anti bodies‟.
Identify the types of immunization here!
What is the advantage of use of biotechnology in molecular biology over traditional
Which attribute of human population do the following figures represent?
Is it possible to have following type of ecological pyramid in the nature? Give reason.
X J of Sunlight
Is self (fertilisation) pollination possible in date palm? Give reasons.
(b) In which part of the female reproductive system the 8 called embryo will be
transferred during test tube baby programme.
a) What is common(evolutionary point of view) between the two plants‟ parts as
b) How does sweet potato and potato differ from following?
Which cell or histological part of the AIDS victim does act a HIV factory? Why does
HIV/AIDS patient become too immuno-deficient to fight against mild infections?
What do you mean by inbreeding depression? How this problem should be solved
during animal breeding?
What is SCP? Write its advantage.
Write with examples, how use of microbes helps us to make different types of cheese
with specific texture & flavors?
How can the „BOD‟ be used as the Indicator of the pollution?
a) Differentiate litter from detritus.
b) Mention the steps in the process of decomposition leading to degradation of
detritus in to simpler inorganic substances.
Explain, how integrated organic farming can help to reduce/check eutrophication.
What may be the reasons for low productivity of ocean?
Draw a labeled diagram of a human sperm.
The following figure represents karyotype (edited) of a person suffering from a
genetic disorder. Study the karyotype and answer the following questions:
a) what may be the reason if the disease is wrongly identified a student as
b) Identify the disorder correctly.
c) Mention the cause and symptoms of the disease.
a) identify the process as shown in the following diagram.
b) Why is it continuous on one strand while discontinuos on other?
c) Mention the enzyme joining the discontinuously synthesized fragments.
Explain Miller‟s experiment to prove the „theory of chemical origin of life‟ as proposed
by Oparin and Haldane.
What do you mean by withdrawal syndrome? Write the side effects of the use of
anabolic steroids in males.
Study the following figure and answer the questions:
a) What does Eco RI & rop in the figure represent?
b) What will happen if transformants with foreign DNA insert at Bam HI (in the above
fig) grown on tetracycline containing medium?
c) What is the advantage to use genes coding for a-galactosidase as selectable
Why & how the bacteria (hosts) are made competent to take up recombinant
How is a transgenic cotton plant protected against army worm?
Explain with examples, how do the plant animal interactions involve co-evolution.
(a) Identify the types of gynoecium (pistil) as shown in the following diagrams A & B.
(b) Write briefly the process of different types of endosperm formation in coconut.
(c) Why does the endosperm development precede embryo development?
Go through the following figure & answer the questions.
(a) Name the pituitary hormones which control the level of Progesterone & estrogen.
(b) Identify & label 1 & 2 as given in the following figure.
(c) By which day of cycle LH & FSH attain a peak level?
(d) Why does the level of progesterone level go below estrogen level by the 25th day
(e) Mention any of the key changes that you are suppose to do in following figure to
indicate that successful fertilization has taken place.
Morgan while carrying 2 separate dihybrid crosses in drosophila to study the genes
that were present on the same chromosome(say X), found that genes did not
segregate independently of each other and therefore, F2 ratio deviated significantly
from expected 9:3:3:1 ratio. He found 98.7% of gametes in F1 were of parental types
& rest 1.3 % were non parental types in cross I while in cross II the % of gametes of
parental combinations & non parental combinations were 62.8% and 37.2%
respectively. Based on the above information answer the following questions:
a) Due to which genetic phenomenon as suggested by Morgan, the F2 ratio (as
stated above) deviated from expected Mendelian ratio, 9:3:3:1.
b) What term used by Morgan to explain the creation of non parental combinations.
c) Differentiate between the genetic phenomenons as identified in a) & b) above.
d) How did the „phenomenon, leading to non parental combination & its frequency‟
use by A. Sturtvent?
e) Why did the % of non parental combinations vary greatly in the above crosses?
Study the following diagram and answer the questions:
a) Based on the only information available in the above diagram, write, how does the
same process differ in bacteria ?
b) Identify & Label (1) & (2).
c) Write the chemical composition of cap and tail added to hnRNA during
d) "the presence of non functional sequences in hnRNA is reminiscent of antiquity",
a) What may be the probable reasons for the greater biodiversity of tropics?
b) Explain the importance of species diversity in reference to the "rivet popper
a) Why do CO2, CH4, N2O etc known as green house gases?
b) See the following flow chart & fill in the blanks at (i), (ii), (iii), (iv)
In the stratosphere
UV rays act upon
Continuous degradation with release of O2
(Result of above
c) Why is CNG better than Diesel?
Effect of preoperative use of topical prednisolone acetate, ketorolac tromethamine, nepafenac and placebo, on the maintenance of intraoperative mydriasis during cataract surgery: A randomized trial Fernando Roberte Zanetti, Enzo Augusto Medeiros Fulco, Fernando Rodrigo Pedreira Chaves, Alexandre Paashaus da Costa Pinto, Carlos Eduardo Leite Arieta, Rodrigo Pessoa Cavalcanti Lira
Voralberger AIDS-Gespräche 2012 hiv und depression ursachen, diagnose, behandlung Steffen Taubert – Was weiß oder vermutet die Wissenschaft? – Depression oder nur schlecht drauf? – Was können Betroffene, Angehörige und Professionelle Zahlen über Zahlen: Prävalenz in der Allgemeinbevölkerung Frauen leiden doppelt so häufig an Depressionen, wie Männer (14,2 & vs. 7,6 %) (Quelle: Bundesgesundheitssurvey 1998/99)