BISE Gujranwala · Class 12 · Biology

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

2025 · Second 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: 8464 · 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

Q1(1)
Solar energy used for evaporation of water and heating up soil is about
- (A)
  01%
- (B)
  95%
- (C)
  99%
- (D)
  90%
Q1(2)
In which plant flowering is induced by Ethene?
- (A)
  Banana
- (B)
  Rose
- (C)
  Pine Apple
- (D)
  Orange
Q1(3)
The most critical phase of mitosis which ensures equal distribution of chromatids in daughter cells is
- (A)
  Anaphase
- (B)
  Metaphase
- (C)
  Prophase
- (D)
  Telophase
Q1(4)
Bombay phenotype is an example of
- (A)
  Pleiotrophy
- (B)
  Dominance
- (C)
  Probability
- (D)
  Epistasis
Q1(5)
A powerful tool of forensic science is a test called
- (A)
  RNA test
- (B)
  DNA test
- (C)
  mRNA test
- (D)
  tRNA test
Q1(6)
Amount of water used in irrigation is about
- (A)
  10%
- (B)
  20%
- (C)
  90%
- (D)
  95%
Q1(7)
Which hormone is chemically steroid?
- (A)
  ADH
- (B)
  Cortisone
- (C)
  Thyroxine
- (D)
  Insulin
Q1(8)
Viral infection can be diagnosed by
- (A)
  PCR
- (B)
  Cloning
- (C)
  Conjugation
- (D)
  Transformation
Q1(9)
Where Urea is produced in human body?
- (A)
  Kidneys
- (B)
  Pancreas
- (C)
  Liver
- (D)
  Lungs
Q1(10)
According to Erwin Chargaff
- (A)
  A+T=C+G
- (B)
  A+G=C+T
- (C)
  A+C=G+T
- (D)
  C+T=A+T
Q1(11)
The methyl group containing Nitrogenous base is
- (A)
  Cytosine
- (B)
  Thymine
- (C)
  Uracil
- (D)
  Adenine
Q1(12)
Lyell published the principle of
- (A)
  Ecology
- (B)
  Geology
- (C)
  Paleontology
- (D)
  Genetics
Q1(13)
A dominant plant of the deciduous forest is
- (A)
  Cactus
- (B)
  Euphorbia
- (C)
  Acacia
- (D)
  Taxus baccata
Q1(14)
The type of light favours cell elongation
- (A)
  Blue
- (B)
  Red
- (C)
  Yellow
- (D)
  Green
Q1(15)
From which cells bone is formed?
- (A)
  Osteoblasts
- (B)
  Osteocytes
- (C)
  Osteoclasts
- (D)
  Chondrocytes
Q1(16)
It has been observed that hyponasty is due to
- (A)
  Auxins
- (B)
  Gibberellins
- (C)
  Cytokinin
- (D)
  ABA
Q1(17)
Germinating pollen grain is rich source of
- (A)
  Gibberellins
- (B)
  Auxins
- (C)
  Cytokinins
- (D)
  Abscisic Acid

Subjective

Printed marks: 68 · Time: 2:40 Hours

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

SECTION-I

Q2
Write short answers to any EIGHT (8) questions.
Q2(i)
What are hydrophytes?
(2 marks)
Q2(ii)
Define anhydrobiosis.
(2 marks)
Q2(iii)
Differentiate between Nephrostome and Nephridiopore.
(2 marks)
Q2(iv)
What is phytochrome?
(2 marks)
Q2(v)
How would you define syphilis?
(2 marks)
Q2(vi)
Differentiate between sapwood and heartwood.
(2 marks)
Q2(vii)
How ecdysis occurs in arthropods?
(2 marks)
Q2(viii)
What is herniation of disc?
(2 marks)
Q2(ix)
Differentiate between limnetic zone and profundal zone.
(2 marks)
Q2(x)
How plants and animals are adapted to Terrestrial Ecosystem?
(2 marks)
Q2(xi)
How balance in nutrient cycle of the ecosystem becomes upset?
(2 marks)
Q2(xii)
Differentiate between health and disease.
(2 marks)
Q3
Write short answers to any EIGHT (8) questions.
Q3(i)
How is Myxoedema different from Cretinism?
(2 marks)
Q3(ii)
What are neurotransmitters? Write down names of two common neurotransmitters.
(2 marks)
Q3(iii)
What are the effects of Adrenaline on the body?
(2 marks)
Q3(iv)
How does incomplete dominance differ from complete dominance?
(2 marks)
Q3(v)
What is pleiotropy? Give its example.
(2 marks)
Q3(vi)
What is hemolytic disease of the newborn?
(2 marks)
Q3(vii)
What are benefits of human genome project?
(2 marks)
Q3(viii)
Why is Taq polymerase used in PCR?
(2 marks)
Q3(ix)
How does gene therapy target cystic fibrosis?
(2 marks)
Q3(x)
What is the significance of decomposers in nutrient recycling?
(2 marks)
Q3(xi)
How do trophic levels relate to energy flow in an ecosystem?
(2 marks)
Q3(xii)
What is commensalism? Give one example.
(2 marks)
Q4
Write short answers to any SIX (6) questions.
Q4(i)
What are teratogens?
(2 marks)
Q4(ii)
Define embryonic induction
(2 marks)
Q4(iii)
Draw acrocentric chromosome.
(2 marks)
Q4(iv)
Differentiate between heterochromatin and euchromatin?
(2 marks)
Q4(v)
What is primer? Give its significance.
(2 marks)
Q4(vi)
What happens in G1 phase of interphase?
(2 marks)
Q4(vii)
Write down the reason and symptoms of turner syndrome.
(2 marks)
Q4(viii)
Define theory of special creation.
(2 marks)
Q4(ix)
State Hardy-Weinberg Theorem.
(2 marks)

SECTION-II

Q5
(8 marks)
1. (a)
  Describe the functions of Nephron.
  (4 marks)
2. (b)
  Explain mitosis by drawing the necessary diagram.
  (4 marks)
Q6
(8 marks)
1. (a)
  Write down four phases during which repair process of simple fracture takes place.
  (4 marks)
2. (b)
  Define Ecosystem. Explain its Biotic Components.
  (4 marks)
Q7
(8 marks)
1. (a)
  Write down two hypothesis that explain how prokaryotic cells transform into eukaryotic cells.
  (4 marks)
2. (b)
  Describe the role of pancreas as endocrine gland.
  (4 marks)
Q8
(8 marks)
1. (a)
  Explain various steps of female reproductive cycle.
  (4 marks)
2. (b)
  What is incomplete dominance? Explain with the example of flower colour of 4’O clock plants.
  (4 marks)
Q9
(8 marks)
1. (a)
  Explain the cleavage in chick embryo.
  (4 marks)
2. (b)
  What is tissue culture? Explain with reference to production of somatic embryos.
  (4 marks)

Original source references (2)

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

Objective · 8464 · Printed marks: 17 · Time: 20 Minutes
Subjective · psp_7e10ba52e92fb4cf8fb132e369fa09f8 · Printed marks: 68 · Time: 2:40 Hours