SET ~ 1

Series EF1GH/2 àíZ-nÌ H moS

Q.P. Code 57/1/1
amob Z¨µ
Roll No.

NOTE
(I) H¥ n`m Om±M H a b| {H Bg àíZ-nÌ _| (I) Please check that this question
_w{XV n¥ð 13 h¢ & paper contains 13 printed pages.

(II) àíZ-nÌ _| Xm{hZo hmW H r Amoa {XE (II) Q.P. Code given on the right hand
àíZ-nÌ H moS H mo narjmWu CÎma-nw{ñVH m side of the question paper should
be written on the title page of the
Ho _wI-n¥ð na {bI| & answer-book by the candidate.
(III) H¥ n`m Om±M H a b| {H Bg àíZ-nÌ _| 33 (III) Please check that this question
àíZ h¢ & paper contains 33 questions.

(IV) H¥ n`m àíZ H m CÎma {bIZm ewê H aZo go (IV) Please write down the serial
nhbo, CÎma-nw{ñVH m _| àíZ H m H« _m§H number of the question in the
answer-book before attempting it.
Adí` {bI| &
(V) Bg àíZ-nÌ H mo nT+Zo Ho {bE 15 {_ (V) 15 minute time has been allotted
ZQ H m g_` {X`m J`m h¡ & àíZ-nÌ H m to read this question paper.
The question paper will be
{dVaU nydm©• _| 10.15 ~Oo {H `m OmEJm & distributed at 10.15 a.m. From
10.15 ~Oo go 10.30 ~Oo VH NmÌ Ho db 10.15 a.m. to 10.30 a.m., the
àíZ-nÌ nT+|Jo Am¡a Bg Ad{Y Ho Xm¡amZ students will read the question
do CÎma-nw{ñVH m na H moB© CÎma Zht {bI|Jo & paper only and will not write
any answer on the answer-book
--- during this period.

BIOLOGY
fu/kkZfjr le; % 3 ?k.Vs vf/kdre vad % 80
Time Allowed: 3 Hours Maximum Marks: 80
General Instructions:
(i) All questions are compulsory.
(ii) The question paper has five sections and 33 questions. All questions are compulsory.
(iii) Section–A has 16 questions of 1 mark each; Section–B has 5 questions of 2 marks
each; Section– C has 7 questions of 3 marks each; Section– D has 2 case-based

57/1/1 1 P.T.O.
 questions of 4 marks each; and Section–E has 3 questions of 5 marks each.
(iv) There is no overall choice. However, internal choices have been provided in some
questions. A student has to attempt only one of the alternatives in such questions.
(v) Wherever necessary, neat and properly labeled diagrams should be drawn.

SECTION - A
1. In the structure of microsporangium shown below, identify the correct
sequence of wall layers from outside to inside:
(ii)
(iii)

(i)
(iv)

(i) (ii) (iii) (iv)

(a) Middle layers Endothecium Epidermis Tapetum
(b) Tapetum Middle layers Endothecium Epidermis
(c) Epidermis Endothecium Middle layers Tapetum
(d) Endothecium Middle layers Tapetum Epidermis
 1
2. Which of the following statements are true related to Seed X and Y?

Seed X
Seed Y

(I) Seed X is dicot and endospermic or albuminous.

(II)Seed X is dicot and non-endospermic or non-albuminous.
(III)Seed Y is monocot and endospermic or albuminous.
(IV)Seed Y is monocot and non-endospermic or non-albuminous.
Choose the correct option with the respect to the nature of the seed:
(a)(I), (III) (b)(II), (III)
(c) (I), (IV) (d)(II), (IV) 1
3. Genotypic ratio of 1 : 2 : 1 is obtained in a cross between:
(a)AB × AB (b)Ab × Ab
(c) Ab × ab (d)ab × ab 1
4. A female undergoing IVF treatment has blocked fallopian tubes. The
technique by which the embryos with more than 8 blastomeres are
transferred into the uterus of the female for further development, then the
process is called as ................... .
57/1/1 2
 (a)Zygote Intra Fallopian Transfer (ZIFT)
(b)Intra Uterine Transfer (IUT)
(c) Gamete Intra Fallopian Transfer (GIFT)
(d)Intra Cytoplasmic Sperm Injection (ICSI) 1
5. Evolutionary convergence is development of a:
(a)common set of characters in groups of different ancestry.
(b)dissimilar set of functions in closely related groups.
(c) common set of structures in closely related groups.
(d)dissimilar set of functions in unrelated groups. 1
6. For the MN-blood group system, the frequencies of M and N alleles are 0.7
and 0.3, respectively. The expected frequency of MN-blood group bearing
organisms is likely to be:
(a)42% (b)49%
(c) 9% (d)58% 1
7. If Meselson and Stahl's experiment is continued for sixth generations in
bacteria, the ratio of Heavy strands 15N/15N : Hybrid 15N/14N : light 14N/14N
containing DNA in the sixth generation would be:
(a)1 : 1 : 1 (b)0 : 1 : 7
(c) 0 : 1 : 15 (d)0 : 1 : 31 1
8. Given below is a dihybrid cross performed on Drosophila:
Cross A

y w y+ w +

Parental
y w
Yellow, white Wild type

y w y w
F1 generation
y+w+
Wild type Yellow, white

Parental Recombinant
type(98.7%) type (1.3%)
y+ w+ y+ w

Wild type White

y w y w+

Yellow, white Yellow

F 2 generation
y+ w+ y+ w

y w y w
Wild type White
57/1/1 y w y w+
3 P.T.O.

y w y w
Yellow, white Yellow
 Wild type White

y w y w+

Yellow, white Yellow

F 2 generation
y+ w+ y+ w

y w y w
Wild type White

y w y w+

y w y w
Yellow, white Yellow

Which of the following conclusions can be drawn on the basis of this cross?
When yellow bodied (y), white eyed (w) Drosophila females were hybridised
with brown bodied (y+), red eyed males (w+) and F1 progenies were inter-
crossed, F2 generation would have shown the following ratio:
(a)1:2:1 because of linkage of genes.
(b)9:3:3:1 because of recombination of genes.
(c) Deviation from 9:3:3:1 ratio because of segregation of genes.
(d)Deviation from 9:3:3:1 ratio because of linkage of genes.  1
9. In which of the following diseases is/are the parasites transmitted to a healthy
individual through the bite of a female mosquito?
(P) Malaria (Q) Ascariasis
(R) Filariasis
Choose the correct option:
(a)Only P (b)Only P and Q
(c) Only P and R (d)All P, Q and R 1
10. The figure below shows the structure of a plasmid.

Bam HI
ampR tetR

pBR322

ori
rop

A foreign DNA was ligated at Bam HI. The transformants were then grown
in a medium containing antibiotics tetracycline and ampicillin. Choose the
correct observation for the growth of bacterial colonies from the given table:
Medium with Medium with
Tetracycline Ampicillin
(a) Growth No growth
(b) No growth Growth
(c) No growth No Growth
(d) Growth Growth

 1

57/1/1 4
 11. A
 collection of methods that allows correction of a gene defect in a child or
embryo is called as:
(a)Gene therapy (b) Silencing
(c) ELISA test (d)Electrophoresis 1
12. Observe the given inverted pyramid of an aquatic ecosystem.

Carnivore 12 gm/m2

Herbivores 8 gm/m2

4 gm/m2
Producers

This ecological pyramid is represented as .............

(a)Pyramid of biomass
(b)Pyramid of energy
(c) Pyramid of number
(d)Pyramid of volume 1
In these questions 13 to 16, a statement of assertion followed by a statement of
reason is given. Choose the correct answer out of the following choices:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
13. 
Assertion (A): 
Apomixis and parthenocarpy are both asexual modes of
reproduction.
Reason (R):  Seeds are not produced in both apomixis and
parthenocarpy. 1
14. 
Assertion (A):RNA polymerases are able to catalyse all three steps of
translation.
Reason (R): RNA polymerases contain an initiation factor and a termi-
nation factor in them. 1
15. There are almost 267 million tobacco users in India. Tobacco exacts a high
cost on society. From 2017–2018, economic cost of tobacco-attributable
disease and death in India INR 1773.4 billion. Of all adults, 28.6% currently
consume tobacco either in smoke or smokeless form, including 42.4% of men
and 14.2% of women. Tobacco use is associated with accelerated mortality
among adults especially in low- and middle-income countries, where the
burden of tobacco-related illness and death is heaviest.

57/1/1 5 P.T.O.
 ADULT TOBACCO USE

Smokers: 7%
Smokeless
tobacco users
18%

Users of
both 4%

Non-users: 71%

Assertion (A): Tobacco consumption can raise blood pressure and increase
heart rate.
Reason (R): Nicotine, an alkaloid is present in tobacco. 1
16. Assertion (A): B. thuringiensis can produce Bt toxin and hence used as a
biopesticide.
Reason (R): The Bt toxin is fatal for insects. 1

SECTION - B
17. In the figure given below, parts A and B show the level of hormones which
influence the menstrual cycle. Study the figure and answer the questions
that follow:

A
FSH LH

Estrogen
B
Progesterone
1 3 5 7 9 11 13 15 17 19 21 23 25 27 291
Days in the menstrual cycle

(A) Name the organs which secrete the hormones represented in parts A
and B.
(B) State the impact of the hormones in part Bon the uterus of the human
female during 6 to 15 days of menstrual cycle? 2
18. A low level of expression of lac operon occurs at all the time. Can you explain
the logic behind this phenomena.2
19. One advantage of incorporating pest resistance in GM crops is, obviously,
that it helps in pest control. Traditionally, chemical pesticides have been
used as pest control methods in agricultural farmlands.
(A) What is the environmental advantage of developing GM crops with pest
resistance?
(B) Name and explain the cellular defense mechanism that has been used
to develop such pest resistance against specific nematodes. 2
20. Discuss the significance of heavy isotope of nitrogen in the Meselson and
Stahl’s experiment. 2
57/1/1 6
 21. Write the relationship between productivity, gross primary productivity, net
primary productivity and secondary productivity.
OR
Is there any limitation to the number of trophic levels in a detritus food
chain? 2

SECTION - C
22. Given below is the diagram of a human ovum surrounded by a few sperms.
With the help of the given diagram answer the following questions.
Y
Z

Ovum

(A) Which one of the sperms would reach the ovum earlier?
(B) Identify 'W' and 'V'. Mention the role of 'V'.
(C) Mention what helps the entry of sperm into the ovum and write the
changes occurring in the ovum during the process.
(D) Name the specific region in the female reproductive system where the
event represented in the diagram takes place. 3
23.  The given diagram shows a part of the human female reproductive system.
Z

Y X

(A) Name the gamete cells that would be present in 'X' if taken from a new-
born baby.
(B) Name 'Y' and write its function.
(C) Name 'Z' and write the events that take place here. 3
24. Suggest and explain any three Assisted Reproductive Technologies (ART) to
an infertile couple. 3
25. (A)How is Hardy-Weinberg's expression “(p2 + 2pq + q2) = 1” derived?
(B) List any two factors that can disturb the genetic equilibrium.2

57/1/1 7 P.T.O.
 26. Given below is the step-by-step process in the formation of yoghurt (curd) in
a bioreactor.
Milk

Milk treated at 85-95 °C for 15-30 minutes

Milk homogenised to an even consistency

Milk cooled

Starter culture of bacteria added

Mixture incubated at 37-44°C

pH decreases

Mixture cooled

Yoghurt (curd) packed and sent at 4°C to shops

(A) Why does the pH start decreasing a while after the mixture is incubated
at 37-44 °C?
(B) From the flowchart, identify two systems that the bioreactor would have.
Give a reason to support your answer.3
27. A pest control program needed to be developed for the Sunderbans Mangrove
ecosystem and biocontrol methods were being explored.
(A) Why would biocontrol methods be the best method for a pest control
program in a biome like Sunderbans?
(B) What is the difference in the action of a biocontrol agents as against
the action of chemical pesticides?
(C) Mention any two points of vital information about the pests that the
designers of the pest control program need to be aware of ?
OR
A bacterium Bacillus thuringiensis produces a toxic protein named ‘Cry
protein’ that is lethal to certain insects but not to bacterium.
(A) Why this toxin does not kill the bacteria?
(B) What type of changes occur in the gut of insects on consuming this
protein?
(C) How man has exploited this protein for his benefit? 3
57/1/1 8
 28. Diversity is seen in the living world at various levels. The distribution of
biodiversity shows specific patterns that account for the species richness or
paucity across the globe.
(A) 
Explain, with reasons, how species diversity changes with changing
latitudes.
(B) The graph below represents species-area relationship. What does such
a graph signify?
Species-area Relationship

35
Number of species

30
25
20
15
10
5
0
0 10 20 30 40 50 60 70
Habitat area (m2) 3

SECTION - D
29. 
Krish was performing experiments with restriction endonucleases. After
the addition of DNA ligase in one of the steps, he proceeded towards the
formation of recombinant molecule of DNA.
He observed that the formation of recombinant DNA fragments was
incredibly low in the first experiment. He concluded that there might have
been some anomaly at the step before the DNA ligase was added. Help him
in writing the final report with Q and A’s about his experiments.
70
Experiment 2

52.5

35
Number

17.5

Experiment 1
0
DNA Fragments

(A) The possibility of usage of multiple restriction endonucleases for cut-

ting DNA fragments is quite high in ................. .
(a) Experiment 1 (b) Experiment 2
(c) Both 1 and 2 (d) Neither 1 and 2
(B) ................... was the organism from which the first restriction endonu-
clease was isolated.
(a) Leptococcus pneuminidae
(b) Haemophilus influenzae
(c) Escherichia coli RY13
(d) Streptomyces griseus
57/1/1 9 P.T.O.
 (C) Each restriction endonuclease recognises .................. in the DNA.
(a) any nucleotide sequence
(b) any palindromic nucleotide sequence
(c) specific palindromic nucleotide sequence
(d) none of the above
(D) Restriction enzymes cut the strand of DNA:
(a) at the center of the palindrome site.
(b) away from the center of the palindrome site but between the same
two bases on the opposite strands.
(c) at the end of the palindrome site but away from the same two bas-
es on the opposite strands.
(d) none of the above
(E) Sticky ends form ................... with their complementary cut counter-
parts.
(a) hydrogen bonds
(b) phosphodiester bonds
(c) covalent
(d) ionic
OR
Chris noted down and plotted the temperature ranges during different phases of PCR
(Polymerase Chain Reaction). He forgot to name the steps and the corresponding
temperatures separately.
He is trying to utilise his existing knowledge about the reaction to get the correct data set
with a graphical representation.
He is maintaining a Q-A sheet regarding PCR side-by-side.
Help Chris in both of his tasks.
Step 2
100

Step 3
75
Degree Celsius

Step 1
50

25

0
Temperature

(A) O
 ne of the steps of the aforementioned experiment has the highest tem-
perature. It will correspond to ..................... phase.
(a)denaturation (b) annealing
(c) extension (d) none of the above
(B) O
 ne of the steps of the aforementioned experiment has the temperature
40ºC to 60ºC. It will correspond to ....................... phase.
(a)denaturation (b) annealing
(c) extension (d) none of the above
57/1/1 10
 (C) A
 fter each cycle of PCR (Polymerase Chain Reaction), the amount of
DNA essentially .................... with respect to the previous cycle.
(a)triples (b) quadruples
(c) doubles (d) remains same
(D) ...................... sets of primers are required for the process of gene ampli-
fication.
(a)One (b) Two
(c) Three (d) Four
(E) PCR (Polymerase Chain Reaction) can be utilised for ....................... .
(a)Pathogen detection
(b)Prenatal diagnosis
(c) DNA fingerprinting
(d)All of the above 4
30. The exponential equation is a useful model for developing intuitive ideas about populations.
The classic example is a pond with a population of lily pads. If each lily pad reproduces
itself (two pads take the place of where one pad had been) each month, and it took, say,
three years for the pond to become half filled with lily pads, how much longer will it take
for the pond to be completely covered with lily pads? If you don’t stop to think too clearly, it
is tempting to say that it will take just as much time, three years, for the second half of the
pond to become as filled as the first. The answer, of course, is one month.
On the basis of the above case, answer the following questions:
(A) One of the characteristics of ................ is the geometric representation of
age structure.
(a) ecosystem (b) landscape
(c) population (d) biotic community
(B) During the rainy season, the population of an insect species shows an
explosive increase in numbers, followed by its disappearance at the end
of the season. What does this indicate?
(a) S-shaped or sigmoid population growth of insect.
(b) Increase in the population of insect predators.
(c) Elimination of their food plants at the end of the rainy season.
(d) Its population growth curve is of J-type.
(C) Along the East coast of Australia, the Great Barrier Reef can be catego-
rised as:
(a) population (b) community
(c) ecosystem (d) biome
(D) All the following are correct about the exponential growth of population
except:
(a) Resources in the habitat are unlimited.
dt
(b) It is represented by the equation = rN.
dN

57/1/1 11 P.T.O.
 (c) The rate of natural increase is represented by “r”.
(d) In 1981, the ‘r ’ value for human population in India was 0.0205.
(E) When a population grows in a habitat with limited resources then fol-
lowing phases of achievement are observed.
(a) Lag-Acceleration-Deceleration-Asymptote
(b) Log-Deceleration-Acceleration-Asymptote
(c) Log-Acceleration-Deceleration-Asymptote
(d) Log-Acceleration-Asymptote-Deceleration
OR
Most likely, you've observed a dog with fleas or ticks. You didn't realize those were parasites,
did you? A relationship between a parasite and a host that is advantageous to the parasite
but harmful to the host is referred to as a parasitic relationship or parasitism. A parasite
is an organism that inhabits a host and causes harm, sometimes even death, to the host.
As fleas are parasites, it makes sense that the dog would be the host. Humans have a lot of
parasites that can be found inside and outside of their bodies. While most parasites aren't
looking to kill their host (because they need them to survive), they can cause serious issues.
Observe the following pictures and answer the questions that follow:

(A) N
 ame and explain the type of parasitism which is shown in the above
given pictures.
(B) D
 efine the adaptation in which a species of prey avoids being detected
by a predator.
(C) W
 hat standard is utilised to determine if a host is an intermediate host
or a definitive host? 4

57/1/1 12
 SECTION - E
31. A village health worker was taking a session with women. She tells the
women that one has to be very careful while using oral pills as method of
birth control. Wrong usage can actually promote conception.
(A) Analyse the statement and compare the merits and demerits of using
oral pills and surgical methods of birth control.
(B) Village woman were confused as to how a thin metallic copper loop can
provide protection against pregnancy. Justify the use, explaining the
mode of action of IUDs. 5
32. (A)How are the following formed and involved in DNA packaging in a
nucleus of a cell?
(i) Histone octamer
(ii) Nucleosone
(iii) Chromatin
(B) Differentiate between euchromatin and heterochromatin.
OR
(A) A true breeding homozygous pea plant with green pods and axial flowers
as dominant characters, is crossed with a recessive homozygous pea
plant with yellow pods and terminal flowers. Work out the cross upto F2
generation respectively.
(B)State the Mendelian principle which can be derived from such a cross
and not from monohybrid cross.  5
33. A patient admitted in hospital was diagnosed with cancer. The condition of
his body cells is depicted in the image below.
A tumour is forming

Cancer cells dividing Normal cells

Observe the image carefully and answer the following questions.

(A) How does a cancerous cell differ from a normal cell?
(B) Benign tumor is less dangerous than a malignant tumor. Why?
(C) Describe the causes of cancer.
(D) Mention the methods of treatment of the disease.

OR
(A) What are the early symptoms of STD’s?
(B) Why do most of the people with STD’s remain undetected for a long
period?
(C) STD’s can get transmitted unknowingly. How? 5
57/1/1 13 P.T.O.