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BISE Gujranwala · Class 12 · Biology

BISE Gujranwala · Class 12 · Biology · 2025 · First Annual · Group 2

2025 · First Annual

Transcribed from the identified examination paper. Check the board, session and course before use. SchoolOrbit is not affiliated with the issuing board.

Objective

Source code: 8462 · Printed marks: 17 · Time: 20 Minutes

You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that circle in front of the relevant question number. Use marker or pen to fill in the circles. Cutting or filling two or more circles will result zero mark in that question.

OBJECTIVE

  1. Q1(1)

    Which is Heterotherm?

    • (A)

      Bat.

    • (B)

      Frog

    • (C)

      Snake

    • (D)

      Man

  2. Q1(2)

    Sclerenchyma cells are highly lignified and found in

    • (A)

      Epidermis

    • (B)

      Cortex

    • (C)

      Pith

    • (D)

      Xylem

  3. Q1(3)

    Which one is not a joint disease?

    • (A)

      Arthritis

    • (B)

      Disc slip

    • (C)

      Spondylosis

    • (D)

      Sciatica

  4. Q1(4)

    All are related to medulla oblongata, except

    • (A)

      Long Term Memory

    • (B)

      Breathing Rate

    • (C)

      Heart Beat Rate

    • (D)

      Blood Pressure

  5. Q1(5)

    Which one is not related to Auxins?

    • (A)

      Promote cell division in cambium

    • (B)

      Promote apical dominance

    • (C)

      Induce Parthenocarpy

    • (D)

      Promote Abscission

  6. Q1(6)

    Corpus luteum secretes a hormone called

    • (A)

      Oestrogen

    • (B)

      Oxytocin

    • (C)

      Progesterone

    • (D)

      Testosterone

  7. Q1(7)

    Grey vegetal cytoplasm gives rise to

    • (A)

      Larval epidermis

    • (B)

      Gut

    • (C)

      Muscle cells

    • (D)

      Neural tube

  8. Q1(8)

    Transfer of genetic material from one cell to another, which alter the genetic make up of recipient cell is called

    • (A)

      Transformation

    • (B)

      Translation

    • (C)

      Transcription

    • (D)

      Transduction

  9. Q1(9)

    Unlike most proteins, Histones are

    • (A)

      Positively charged

    • (B)

      Negatively charged

    • (C)

      Neutral

    • (D)

      Discharged

  10. Q1(10)

    The number of sets of microtubules originates from each pair of centrioles is

    • (A)

      6

    • (B)

      5

    • (C)

      4

    • (D)

      3

  11. Q1(11)

    Secretors have dominant secretor gene Se on chromosome number

    • (A)

      24

    • (B)

      21

    • (C)

      19

    • (D)

      9

  12. Q1(12)

    Genome fragments can be separated according to their length during the process

    • (A)

      RFLPs

    • (B)

      PCR

    • (C)

      Cloning

    • (D)

      Gel Electrophoresis

  13. Q1(13)

    The production of many identical copies of a gene is

    • (A)

      Translation

    • (B)

      Cloning

    • (C)

      Replication

    • (D)

      PCR

  14. Q1(14)

    Lyell published the principles of

    • (A)

      Ecology

    • (B)

      Geology

    • (C)

      Palaeontology

    • (D)

      Genetics

  15. Q1(15)

    The total energy from sun trapped by producer in an ecosystem is

    • (A)

      1%

    • (B)

      10%

    • (C)

      60%

    • (D)

      90%

  16. Q1(16)

    The average rainfall in temperate deciduous forest is between (mm)

    • (A)

      600–1500

    • (B)

      650–1500

    • (C)

      700–1500

    • (D)

      750–1500

  17. Q1(17)

    Beri Beri is caused by

    • (A)

      Infection

    • (B)

      Physical disorders

    • (C)

      Nutritional deficiency

    • (D)

      Chemical causes

Subjective

Printed marks: 68 · Time: 2:40 Hours

Note: Section I is compulsory. Attempt any THREE (3) questions from Section II.

SECTION-I

  1. Q2

    Write short answers to any EIGHT (8) questions.

  2. Q2(i)

    What are heat shock proteins? Give their role in plants to avoid the effects of high temperature.

    (2 marks)
  3. Q2(ii)

    Briefly write about urea cycle.

    (2 marks)
  4. Q2(iii)

    Skin of animals cannot be considered as excretory organ, justify.

    (2 marks)
  5. Q2(iv)

    Differentiate between epinasty and hyponasty.

    (2 marks)
  6. Q2(v)

    How do aerobic exercises make skeletal muscles more efficient and fatigue resistant?

    (2 marks)
  7. Q2(vi)

    What is foramen trioseum? Give its role in the flight of birds.

    (2 marks)
  8. Q2(vii)

    Write down the cause and symptoms of Genitel herpes.

    (2 marks)
  9. Q2(viii)

    How would you compare short day and long day plants.

    (2 marks)
  10. Q2(ix)

    What type of life is found in the profundal zone of fresh water lake ecosystem? Also write reason.

    (2 marks)
  11. Q2(x)

    Differentiate between Alpine and Boreal forests.

    (2 marks)
  12. Q2(xi)

    What is Geothermal energy? Give demerits of using it.

    (2 marks)
  13. Q2(xii)

    What is the cause of depletion of ozone layer? Also write the consequence of its depletion?

    (2 marks)
  14. Q3

    Write short answers to any EIGHT (8) questions.

  15. Q3(i)

    Justify, calcitonin is antagonistic of parathermone.

    (2 marks)
  16. Q3(ii)

    Differentiate between etiolated and chlorosis.

    (2 marks)
  17. Q3(iii)

    Write down chemical nature of hormones with suitable examples.

    (2 marks)
  18. Q3(iv)

    How epistasis is different from dominance?

    (2 marks)
  19. Q3(v)

    Differentiate between genome and gene pool.

    (2 marks)
  20. Q3(vi)

    Define probability. Give an example.

    (2 marks)
  21. Q3(vii)

    Write down three ways to get a gene.

    (2 marks)
  22. Q3(viii)

    What is anther culture? Give its significance.

    (2 marks)
  23. Q3(ix)

    Write down two applications of polymerase chain reaction.

    (2 marks)
  24. Q3(x)

    What happens when we remove predators from an ecosystem?

    (2 marks)
  25. Q3(xi)

    Define the term niche? Who proposed this term?

    (2 marks)
  26. Q3(xii)

    Differentiate between primary and secondary succession.

    (2 marks)
  27. Q4

    Write short answers to any SIX (6) questions.

  28. Q4(i)

    Compare Morulla with Blastula.

    (2 marks)
  29. Q4(ii)

    What changes occur during phase of maturation in plant growth?

    (2 marks)
  30. Q4(iii)

    Define point mutation. Give one example.

    (2 marks)
  31. Q4(iv)

    Write down names of different enzymes that synthesize m.RNA, t.RNA and r.RNA in Eukaryotes.

    (2 marks)
  32. Q4(v)

    What are okazaki fragment? Write their composition in prokaryotes and eukaryotes.

    (2 marks)
  33. Q4(vi)

    Write down some changes that take place during S.phase of interphase

    (2 marks)
  34. Q4(vii)

    Write down two differences between Mitosis and Meiosis.

    (2 marks)
  35. Q4(viii)

    Write down names of four species declared as extinct in Pakistan.

    (2 marks)
  36. Q4(ix)

    Write down two reasons that cause the species to be endangered.

    (2 marks)

SECTION-II

  1. Q5
    (8 marks)
    1. (a)

      Describe cell cycle through illustrations.

      (4 marks)
    2. (b)

      Explain the urinary system of man.

      (4 marks)
  2. Q6
    (8 marks)
    1. (a)

      Describe different means of support in plants.

      (4 marks)
    2. (b)

      Explain food chain and food web in detail.

      (4 marks)
  3. Q7
    (8 marks)
    1. (a)

      Describe the primary functions of Thyroid Hormones in the human body.

      (4 marks)
    2. (b)

      What is the endosymbiont hypothesis? How does it explain the origin of eukaryotic cells?

      (4 marks)
  4. Q8
    (8 marks)
    1. (a)

      Explain reproductive system in human males.

      (4 marks)
    2. (b)

      What are polygenic traits? Explain with the example of genetics of wheat grain colour.

      (4 marks)
  5. Q9
    (8 marks)
    1. (a)

      Define embryonic induction. How does the organizer region play a role in embryonic induction?

      (4 marks)
    2. (b)

      What are Transgenic Bacteria? Explain benefits of genetically modified bacteria in various industries.

      (4 marks)
Original source references (2)

The original files and numbering are retained. Equivalent files do not repeat the questions above.

  • Objective · 8462 · Printed marks: 17 · Time: 20 Minutes
  • Subjective · psp_0c8575a3e490227dab4019a0d9e92ffa · Printed marks: 68 · Time: 2:40 Hours