BISE Gujranwala · Class 12 · Biology

BISE Gujranwala · Class 12 · Biology · 2025 · Second Annual · Group 1

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: 8467 · 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)
Indicate the wrong statement
- (A)
  Adrenaline releases glucose from liver glycogen
- (B)
  Nor-adrenaline releases glucose from liver glycogen
- (C)
  Sympathetic system is reinforced by epinephrine
- (D)
  Pupil dilates by parasympathetic system
Q1(2)
According to endosymbiont hypothesis, tail in present day cells was developed by ingestion of
- (A)
  Cyanobacteria
- (B)
  Spirochete
- (C)
  Aerobic bacteria
- (D)
  Mitochondria
Q1(3)
Fertilizer and insecticides are similar because both increase
- (A)
  Agriculture produce
- (B)
  Fertility of soil
- (C)
  Soil pollution
- (D)
  Both “A” and “C”
Q1(4)
Indicate the wrong statement
- (A)
  Neisseria can infect the eyes of infants
- (B)
  Interstitial cells are present between seminiferous tubules
- (C)
  Treponema pallidum damage joints
- (D)
  Etiolation is promoted by red light
Q1(5)
Eutrophication is not related with
- (A)
  Rise in Nitrogen
- (B)
  Rise in $O_{2}$ level
- (C)
  Death of small fishes
- (D)
  Depletion in $O_{2}$ level
Q1(6)
Nutrasweet is
- (A)
  A Disaccharide
- (B)
  A Trisccharide
- (C)
  A Dipeptide
- (D)
  A recombinant DNA molecule
Q1(7)
$\underline{}$ is a wrong pair.
- (A)
  $β$ -chain of hemoglobin & sickle cell anemia
- (B)
  Penicillium & chromosomes
- (C)
  5′ end of 7-methyle GTP cap & 5′ end of mRNA
- (D)
  UAG & Tryptophan
Q1(8)
Blue cone monochromacy is
- (A)
  X-linked recessive trait
- (B)
  Autosomal disorder
- (C)
  Y-linked dominant trait
- (D)
  Y-linked recessive trait
Q1(9)
The amount of energy lost (as heat) as by-product of respiration is about
- (A)
  50–60%
- (B)
  60–70%
- (C)
  70–90%
- (D)
  80–90%
Q1(10)
Kidneys’ weight of a man weighing 70kg, will be
- (A)
  1kg
- (B)
  3.4kg
- (C)
  0.7kg
- (D)
  1.7kg
Q1(11)
Cardiac muscles and smooth muscles are different because cardiac muscles are
- (A)
  Branched
- (B)
  Involuntary
- (C)
  Uninucleate celled
- (D)
  Both “a” and “b”
Q1(12)
Which part of brain engages the complex activity of flight?
- (A)
  Cerebrum
- (B)
  Cerebellum
- (C)
  Medulla
- (D)
  Pons
Q1(13)
If 44 autosomes with two X-chromosomes are present in the cells, the individual will be
- (A)
  Normal male
- (B)
  Jacob syndrome
- (C)
  Metafemale
- (D)
  Normal female
Q1(14)
A bioreactor is used for
- (A)
  Production of bacteria
- (B)
  Production of recombinant yeast
- (C)
  Production of recombinant genes
- (D)
  Production of recombinant DNA
Q1(15)
$\underline{}$ is true statement.
- (A)
  First Amino Acid of polypeptides is methionine
- (B)
  At 6 position on N-terminal of $β$ -chain of haemoglobin is valine
- (C)
  Histones are negatively charged proteins
- (D)
  Arginine is specified by ACA in bacteria
Q1(16)
$\underline{}$ is false statement.
- (A)
  Aging is caused by negative physiological changes
- (B)
  Inhibitory effect of apical bud is caused by auxins
- (C)
  Higher supply of Oxygen inhibits growth
- (D)
  Blue light favors elongation of plant cells
Q1(17)
When skeletal muscle is at rest, the binding sites on actin chain are covered over by
- (A)
  Troponin
- (B)
  Tropomyosin
- (C)
  Cross Bridges
- (D)
  Myosin Heads

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)
Define homeostasis.
(2 marks)
Q2(ii)
How fresh water organisms osmoregulate?
(2 marks)
Q2(iii)
Give two functions of liver in body.
(2 marks)
Q2(iv)
Differentiate between sapwood and heartwood.
(2 marks)
Q2(v)
Give name and number of facial bones.
(2 marks)
Q2(vi)
What is microcephaly?
(2 marks)
Q2(vii)
Write down names of methods of asexual reproduction in plants.
(2 marks)
Q2(viii)
How apomixis differs from parthenogenesis?
(2 marks)
Q2(ix)
Give two salient features of Tundra Ecosystem.
(2 marks)
Q2(x)
What types of plants are present in desert ecosystem?
(2 marks)
Q2(xi)
How balance in nutrient cycle is disturbed?
(2 marks)
Q2(xii)
Give significance of wild life.
(2 marks)
Q3
Write short answers to any EIGHT (8) questions.
Q3(i)
How does Nicotine affect the human nervous system?
(2 marks)
Q3(ii)
Describe briefly the Hypothalamus as an endocrine gland.
(2 marks)
Q3(iii)
Compare sympathetic and Parasympathetic Nervous System.
(2 marks)
Q3(iv)
How is the ABO blood group system inherited?
(2 marks)
Q3(v)
Why Rh-compatibility is important in pregnancy?
(2 marks)
Q3(vi)
What is epistasis? Differentiate it from dominance.
(2 marks)
Q3(vii)
Why urine is preferred to isolate biotechnology products than milk?
(2 marks)
Q3(viii)
Discuss Sanger’s method of gene sequencing.
(2 marks)
Q3(ix)
What is the role of restriction enzyme in Genetic Engineering?
(2 marks)
Q3(x)
Give the significance of Root Nodules in Nitrogen Fixation.
(2 marks)
Q3(xi)
How does predation affect the prey population?
(2 marks)
Q3(xii)
What do you know about the Biotic components of an ecosystem?
(2 marks)
Q4
Write short answers to any SIX (6) questions.
Q4(i)
How meristem is divided into different types?
(2 marks)
Q4(ii)
What is morula?
(2 marks)
Q4(iii)
How Rosalind Franklin determined the DNA molecule had shape of helix?
(2 marks)
Q4(iv)
What is dispersive model of DNA replication?
(2 marks)
Q4(v)
How translation starts in prokaryotes?
(2 marks)
Q4(vi)
How cancerous cells can be distinguished from normal cells?
(2 marks)
Q4(vii)
What is inheritance of acquired characters?
(2 marks)
Q4(viii)
How would analogous organs be defined?
(2 marks)
Q4(ix)
How apoptosis is important for organisms?
(2 marks)

SECTION-II

Q5
(8 marks)
1. (a)
  Describe excretion in cockroach. Also draw labelled diagram.
  (4 marks)
2. (b)
  Define cell cycle. Explain diagrammatically its various stages.
  (4 marks)
Q6
(8 marks)
1. (a)
  Describe a Hinge joint and explain how it is moved by antagonistic muscles?
  (4 marks)
2. (b)
  What is denitrification? Explain Nitrogen depletion and its remedies in Nitrogen Cycle.
  (4 marks)
Q7
(8 marks)
1. (a)
  Describe in details the hormones secreted by the anterior pituitary.
  (4 marks)
2. (b)
  Explain various factors affecting gene frequency of a population.
  (4 marks)
Q8
(8 marks)
1. (a)
  Write down a comprehensive note on STD’s.
  (4 marks)
2. (b)
  Write down any two patterns of sex determination in animals.
  (4 marks)
Q9
(8 marks)
1. (a)
  What is Growth Correlation? Write down its mechanism.
  (4 marks)
2. (b)
  Define Invivo Gene Therapy. Explain it with two examples.
  (4 marks)

Original source references (2)

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

Objective · 8467 · Printed marks: 17 · Time: 20 Minutes
Subjective · psp_0ec8bb76c41ab125e42b274468b014cf · Printed marks: 68 · Time: 2:40 Hours