S.G.V’s Nobel Science P.U.

College, Bailhongal
P.U.C – IInd Year – Mid Term Examination – October – 2024
Sub: Biology (36)
Time : 3 Hrs. Max. Marks :70

General Instructions: This Question paper consists of parts A, B, C, D & E

Part – A consists of I and II and Part D consists of V and VI
All the parts are compulsory
The answers for Part – A written in the first two pages of the answer booklet are only considered for evaluation
Part – E consists of questions for visually challenged students only
PART- A
I. Select the correct alternative from the choices given below: 15 x 1=15
1.The Ploidy of Perisperm present in beet seed is
a) Haploid b) Diploid c) Tetraploid d) Triploid
2. Some plants such as Viola (common pansy), Oxalis and Commelina produce two types of flowers namely
a) Chasmogamous and Xenogamous b) Cleistogamous and Geitonogamous
c) Geitonogamous and Xenogamous d) Chasmogamous and Cleistogamous
3.The correct sequence of embryonic development in angiosperm is
a) Zygote Globular Pro –embryo Heart shaped Mature embryo
b) Zygote Heart shaped Pro –embryo Globular Mature embryo
c) Zygote Pro –embryo Globular Heart shaped Mature embryo
d) Zygote Globular Heart shaped Pro –embryo Mature embryo
4. During pregnancy the foetus develops limbs and digits
a) After three weeks b) after eight weeks c) After six weeks d) after nine weeks
5. In spermatogenesis, if FSH hormone is not secreted from the anterior pituitary gland, which stage is
affected
a) Formation of primary spermatocyte b) formation of spermatozoa
c) Formation of spermatid d) formation of secondary spermatocyte
6. To produce 2000 sperm and 400 ova, how many spermatogonia and oogonia are required?
a) 500 spermatogonia and 200 oogonia b) 500 spermatogonia and 400 oogonia
c) 250 spermatogonia and 250 oogonia d) 250 spermatogonia and 400 oogonia
7. (p + q)2 = p2 + 2pq + q2 represents an equation used in:
a) Population genetics b) Molecular genetics c) Mendelian genetics d) Biometrics
8. Out of the options given below choose the correct stage for transfer to the fallopian tube for successful
IVF results.
a) Embryo up to 8 blastomeres b) embryo up to 16 blastomeres
c) Embryo up to 32 blastomeres d) Embryo up to 32 blastomeres
9. In Lac –operon, if mutation occurs in the Z – gene
a) Transacetylase will not be synthesized b) β- galactosidase will not be synthesized
c) Permease will not be synthesized d) Lactose digestion will be rapid

10. Match the type of Man with their origin periods and choose the correct answer
 Column I Column II
A. Ramapithecus i) 1.5 mya
B. Australopithecines ii) 15 mya
C. Homo erectus iii) 1, 00, 000 -40,000 years back
D. Neanderthal man iv) 2 mya
v) 3 mya
a) A-i, B -iv, C –iii, D-ii b) A –ii, B- iv, C-i, D – iii
c) A –iii, B- i, C-iv, D- v d) A- iv, B –ii, C –iii, D – v
11. The factors that affect Hardy – Weinberg equilibrium are listed below;
i) Crossing over, Independent assortment ii) Crossing over, Mutation, iii) Genetic drift, Crossing over
iv) Independent assortment, Mutation Choose the correct options:
a) i, ii and iii b) ii, iii and iv c) i, iii and iv d) i, ii, iii and iv
12. Triploid condition is observed in
a) Egg Cell b)Antipodals c)Synergid d)Primary endospearm nucleus
13. The first movements of the foetus are observed during which month of pregnancy?
a) First month b) Second month c)Fifth month d)Sixth Month
14. An example for non-medicated IUD is
a)Cu-T b) Lippes loop c. c)LNG-20 d)multiload -375
15. Appearance of autosomal recessive traits results in a condition called
a) Phenyl ketonuria b)Turner’s Syndrome c) Haemophilia d)Colour blindness
II. Fill in the blanks by choosing the appropriate word/words from those given in the bracket. 5x1 = 5
(Different ancestry, Coelacanth , Amniocentesis, Stamen,Haploid,common ancestry,)
16. Statutory ban on ____________ is required to check increasing female foeticides.
17. A fish thought to be extinct and caught in South Africa in 1938 is __________.
18. The male reproductive part of a flower is _______.
19. Homology indicates __________
20. Male and female gametes are _____________

PART –B
III.Ans any five the following questions in 3-5 sentences wherever applicable: 5 x 2 =10
21. What are emergency contraceptives? Write their hormonal combination.
22. Differentiate between geitonogamy and xenogamy.
23. Derive the phenotypic and genotypic ratio of a cross between AB blood group parents.
24. What is haplo-diploid sex determination mechanism? Mention an animal which exhibits this.
25. Write a note on the role of sigma factor and the rho factor in transcription in prokaryotes.
26. Write a short note on Neanderthal man.
27.Why are human testes located outside the abdominal cavity? Name the pouch in which they are present.
PART – C
IV. Answer any FIVE of the following questions in 40-80 words each, wherever Applicable 5x3 =15
28. Draw a labelled diagram of Transverse section of young anther.
29. 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) Name the organs/glands which secrete the hormones represented in labelled parts A and B. (1M)
b) State the role of hormones secreted from part B on the uterus of human female during menstrual
cycle.(2M)
30. Suggest three simple principles through which we can prevent sexually transmitted diseases
31. Write the salient feature of the following human ancestors;
i) Dryopithecus ii) Ramapithecus iii) Australopithecus iv) Homo habilis v) Neanderthal man
vi) Homo erectus
32. Mention any three applications of DNA fingerprinting technique.
33. Write the karyotype of the following syndromes,
i) Down’s syndrome ii) Klinefelter’s syndrome iii) Turner’s syndrome
34. Draw a labeled diagram of Miller’s experimental set up.
PART – D
V. Answer any FOUR of the following questions in about 200–250 words each wherever applicable:4 x 5 =
20
35. With reference to flower colour in Snapdragon, explain incomplete dominance..
36. List the salient features of Human genome Project (HGP)
37. Describe the Harshey – chase experiment to prove that the DNA is genetic material
38. Draw a labeled diagrammatic sectional view of the human female reproductive system.
39. In Mendel’s Experiment, When two pairs of traits are combined in a hybrid segregation of one pair of
characters. Justify this by representing schematically the two gene inheritance
40. Give reasons for the following:
a) A simple cut result in non-stop bleeding in haemophilia affected individuals.
b) Turner’s syndrome affected females are usually sterile.
c) In Morgan’s dihybrid cross experiments on Drosophila showed that flies having genes for yellow
body and white eyes exhibited less recombination.
d) Inheritance of skin colour in the humans shows different phenotypes.
e) Accumulation of phenylalanine in the body of phenylketonuria affected individuals
41.

a) Identify the polarity of X and Y in the above given diagram and how many more amino acids are
expected to be added to this elongating polypeptide chain (2M)
b) Which sequences of bases are generally found at the X and Y polarity? (1M)
c) Mention the anticodon for alanine and valine amino acids based on the diagram (1M)
d) What is the composition of the catalyst involved in the peptide bond formation in this process?

VI. Answer any ONE of the following questions in 200-250 words each, wherever applicable: 1x5 = 5
42. Picture of a mature angiosperm embryo sac is given below and answer the question that follows.

a) Which cells/nuclei of the embryo sac produce zygote and primary endosperm nucleus? (2M)
b) What is the ploidy of antipodal cells and primary endosperm nucleus?(2M)
c) Why the endosperm development precedes embryo development? (1M)

43. a) State Hardy –Weinberg Principle. Mention any four factors affecting Hardy- Weinberg Equilibrium.
b) What are analogous organs? Give an example in plants.
44. a)Mention any two natural methods of birth control.
b)How do the following assisted reproductive technologies assist the couple to have children?
i) In Vitro Fertilisation (IVF)
ii) Zygote Intra Fallopian Transfer (ZIFT)
iii)Gamete Intra Fallopian Transfer (GIFT)