  36

Registration No:

LX–2025

36
 
Subject Code

 / BIOLOGY
(Kannada and English Versions)
: 3  00  (   : 44)  : 70
Time : 3 Hours 00 Minutes] [Total No. of Questions : 44] [Max. Marks : 70
(Kannada Version)

 :
1.     . , , , .
 - , I  II,  -,  I   II  .
2. 
3.   .
    .    
4. 
.
  -           
5. 
.

 - 
      .
I.  (15 × 1 = 15)
 I :      .
1)
 II : 
       
  .
       .
(a)  I   II  .
(b)  I    II 
 I    II .
(c) 
(d)  I   II  .
36
36 BIOLOGY P.T.O. 1
S-6
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(English Version)
Instructions :
1. The question paper consists of four Parts – A, B, C and D.
2. PART – A consists of I & II and PART – D consists of Section I and Section II.
3. All the parts are compulsory.
4. Draw diagrams wherever necessary, unlabelled diagrams or illustrations do not attract
any marks.

5. For PART – A questions, only the first written answers will be considered for valuation.

PART – A
I. Select the correct alternative from the choices given below: (15 × 1 = 15)
1)
Statement I : Pollen grains of many species cause chronic respiratory disorders.
Statement II : Generative cell is bigger than vegetative cell and has abundant food
reserve.
Choose the correct answer from the options given below.
(a) Both statement I and statement II are correct
(b) Statement I is correct and Statement II is wrong
(c) Statement I is wrong and Statement II is correct
(d) Both Statement I and Statement II are wrong
2) Name the process by which spermatids are transformed into spermatozoa.
(a) Spermiation

(b) Spermatogenesis

(c) Spermiogenesis
(d) Ovulation

3) Oral contraceptive pills mainly contain

(a) Progestogen and LH
(b) Progestogen, Estrogen and LH
(c) Progestogen, HCG and Estrogen
(d) Progestogen and Estrogen

P.T.O. 9
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4) XO type of sex determination is observed in

(a) Birds

(b) Grasshopper

(c) Drosophila

(d) Honey bees

5) If a double stranded DNA has 30 percent Thymine, then calculate the percentage
of Guanine in the DNA.

(a) 20%

(b) 30%

(c) 60%

(d) 70%

6) Identify the following in the order of evolution.

(a) Neanderthal → Homo habilis → Homo erectus → Homo sapiens

(b) Homo habilis → Neanderthal → Homo erectus → Homo sapiens

(c) Homo habilis → Homo erectus → Neanderthal → Homo sapiens

(d) Neanderthal → Homo erectus → Homo habilis → Homo sapiens

7) Which of the following cells actively participate during allergy?

(a) RBC (b) B – Lymphocytes

(c) T – Lymphocytes (d) Mast cells

8) Identify the disease when lips and finger nails may turn gray to bluish in colour in
severe cases.

(a) Malaria (b) Pneumonia

(c) Hepatitis – B (d) AIDS

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9) The nutritional quality of curd is improved by which vitamin?

(a) B12 (b) B2
(c) B6 (d) B1

10) The majority of Baculoviruses used as biological control agents are rich in the
genus
(a) Nucleopoly hedro virus
(b) Retro virus
(c) DNA virus
(d) Bacterio phage

11) Restriction sequence of ECO–RII is

(a) 5' – C T T A A G – 3' (b) 5' – G A A T T C – 3'
(c) 3' – G A A T T C – 5' (d) 3' – C T T A A G – 5'

12) Which growth curve is obtained when the resources availability in a habitat is
unlimited?
(a) Exponential (b) Logistic
(c) Sigmoid (d) Linear

13) With regard to foetus in human beings, some of the following events take place
during the development.

(i) Develops limbs and digits

(ii) Major organ systems are formed

(iii) Eye lids separate and eyelashes are formed.

(iv) Heart is formed

Choose the correct option among the following which shows the correct sequence
of development:
(a) i, ii, iii & iv (b) i, iii, iv & ii
(c) ii, iii, iv & i (d) iv, i, ii & iii

P.T.O. 11
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14) The following are some of the in-situ conservation methods, except
(a) National park
(b) Wildlife sanctuaries
(c) Biosphere reserves
(d) Botanical gardens
15) The historic convention "The Earth Summit" held in Rio de Janeiro in 1992 to
discuss on
(a) Global warming (b) Sustainable developments
(c) Biological diversity (d) Ban on plastic

II. Fill in the blanks by choosing the appropriate word/words from those given below:
 (5 × 1 = 5)
(Chitin, Chitinase, Aedes, Lobefins, Nematode, Anopheles)
16) The animals called _____ evolved into the first amphibians that lived on both land
and water.
17) Dengue and chickengunya diseases are spread through ______ vector.
18) The enzyme used to break open to release DNA in fungal cells is ______.
19) Meloidogyne incognitia is a ______.
20) The rate of decomposition is slower if detritus is rich in _______.

PART – B
III. Answer any FIVE of the following questions in 3–5 sentences each wherever applicable:
 (5 × 2 = 10)

21) What is Perisperm? Give an example of perispermic seed.

22) Mention two uncurable sexually transmitted diseases.

23) Differentiate Exon and Intron.

24) What are fossils? Name the method by which ages of fossils are calculated.

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25) Why penicillin and statins drag more attention in the field of medicine?

26) Name any two biodiversity hotspots of India.

27) What is pedigree analysis? Identify the following symbol representing.

PART – C

IV. Answer any FIVE of the following questions in about 40–80 words each wherever

applicable: (5 × 3 = 15)

28) Draw a neat labelled diagram of typical Anatrophous ovule.

29) What is placenta? List the functions of Human Placenta.

30) What is infertility? How IVF method helps to overcome infertility? Explain.

31) (a) Justify the following statements: 2

(i) Flippers of Penguins and Dolphins are the results of convergent evolution.

(ii) Thorns of Bougainvillea and tendrils of Cucurbita are the result of divergent

evolution.

(b) State Hardy-Weinburg principle. 1

32) Name the Plants A, B and C from which the following drugs are extracted.

Drugs Plants
Smack A
Crack B
Marijuana C

33) Explain briefly biological treatment of sewage water.

P.T.O. 13
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34) Define the following terms:

(a) Standing Crop

(b) Stratification

(c) Trophic Level

PART – D

Section - I

V. Answer any FOUR of the following questions in about 200–250 words each wherever
applicable: (4 × 5 = 20)

35) (a) Some angiospermic plants pollinate only with the help of wind, why? 3
(b) Why apple is called false fruit? Which part of the apple flower forms the fruit?2
36) Draw a neat labelled diagram of sectional view of mammary gland.
37) Explain Mendel's law of dominance with an example and draw a conclusion.
38) List the goals of Human Genome Project.
39) Schematically represent the life cycle of retrovirus in human body with labels.
40) Briefly explain the steps of recombinant DNA technology.

41) (a) Define Aneuploidy. Give two examples of aneuploidy. 3

(b) Write a note on Phenylketonuria. 2

Section - II

VI. Answer any ONE of the following questions in about 200–250 words wherever
applicable (1 × 5 = 5)

42) In the context to Lac operon, when Jacob and Monod cultured E. Coli in a media
devoid of Lactose, E. Coli cells formed the colonies and when Lactose was added,
the E. Coli cells metabolized lactose by synthesizing enzymes. Explain how
Lac operon switches off and switches on.

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43) (a) With respect to tissue culture, define the following terms: 3
(i) Micropropagation
(ii) Somaclones
(iii) Somatic hybridization
(b) What is Biopiracy? 1
(c) Expand GEAC with regard to Biotechnology research. 1

44) Name the type of species interactions seen in each of the following example:
(a) Marine fish and copepods
(b) Balanus and chathamalus
(c) Fig tree and wasp
(d) The cattle egrets and grazing cattle
(e) Ophrys orchid and Honey bees
___________

P.T.O. 15