BISE Multan · Class 12 · Biology

BISE Multan · Class 12 · Biology · 2025 · Second Annual · Code 4461

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: 4461 · Printed marks: 17 · Time: 20 Minutes

Q.No.1 You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.

OBJECTIVE

Q1(1)
Fish of fresh water environment does not possess one of the given strategy for osmoregulation:
- (A)
  Produces dilute urine
- (B)
  Prefers salty food
- (C)
  Drinks a lot of water
- (D)
  Actively uptakes salts through gills
Q1(2)
One of the given is not a paired facial bone:
- (A)
  Vomer
- (B)
  Inferior concha
- (C)
  Lacrimal
- (D)
  Nasal
Q1(3)
You are wishing to eliminate broad leaved weeds from your lawn, which plant hormone be the best option to spray:
- (A)
  NAA
- (B)
  2,4-D
- (C)
  GA
- (D)
  $G A_{3}$
Q1(4)
Distension of cervix, decrease progesterone level and suckling are the stimuli for the release of which hormone?
- (A)
  Vasopressin
- (B)
  Secretin
- (C)
  Melanophore stimulating hormone
- (D)
  Oxytocin
Q1(5)
In human females, pregnancy is most likely to occur in the week of menstrual cycle:
- (A)
  $1^{s t}$
- (B)
  $2^{n d}$
- (C)
  $3^{r d}$
- (D)
  $4^{t h}$
Q1(6)
The stage in the development of animals during which three germinal layers are formed is known as:
- (A)
  Cleavage
- (B)
  Organogenesis
- (C)
  Gastrulation
- (D)
  Blastulation
Q1(7)
Genetic code is universal, because:
- (A)
  It is same for all the organisms
- (B)
  It is without punctuation
- (C)
  It consists of three nucleotides
- (D)
  It is universally accepted
Q1(8)
An enzyme which catalyzes the attachment of tRNA with specific amino acid is:
- (A)
  Helicase
- (B)
  Aminoacyl-tRNA synthetase
- (C)
  RNA polymerase
- (D)
  Amino peptidase
Q1(9)
Considering the events of telophase, this phase appears to be the reverse of:
- (A)
  Anaphase
- (B)
  Metaphase
- (C)
  Prophase
- (D)
  Interphase
Q1(10)
Androgenic insensitivity is found in one of the x-linked traits:
- (A)
  Testicular feminization syndrome
- (B)
  Haemophilia A
- (C)
  Hypophosphatemic ricket
- (D)
  Red-green blindness
Q1(11)
During DNA finger printing, a unique collection of various sized DNA fragments are produced by:
- (A)
  Gel electrophoresis
- (B)
  Applying radioactive probe
- (C)
  Performing autoradiography
- (D)
  Digesting genome with restriction enzymes
Q1(12)
Cystic fibrosis patients lack a gene that codes for trans-membrane carrier of the:
- (A)
  Potassium ions
- (B)
  Chloride ions
- (C)
  Sodium ions
- (D)
  Calcium ions
Q1(13)
The organs which are functionally different but structurally alike are called:
- (A)
  Homologous organs
- (B)
  Analogous organs
- (C)
  Vestigial organs
- (D)
  Rudimentary organs
Q1(14)
The process in which soil living bacteria convert soil nitrates back to atmospheric nitrogen is called:
- (A)
  Ammonification
- (B)
  Nitrification
- (C)
  Assimilation
- (D)
  Denitrification
Q1(15)
Layering is the characteristic of which type of ecosystem?
- (A)
  Tundra
- (B)
  Desert
- (C)
  Grassland
- (D)
  Forests
Q1(16)
The heat energy which is trapped underground as volcanoes, hot springs and geysers:
- (A)
  Nuclear energy
- (B)
  Geothermal energy
- (C)
  Fossil fuels
- (D)
  Soil energy
Q1(17)
During contraction of muscles, calcium ions bind with the protein:
- (A)
  Troponin
- (B)
  Tropomyosin
- (C)
  Actin
- (D)
  Myosin

Subjective

Source code: 27 · Printed marks: 68 · Time: 2.40 Hours

NOTE: Write same question number and its parts number on answer book, as given in the question paper.
NOTE: Attempt any three questions.

SECTION-I

Q2
Attempt any eight parts.
Q2(i)
Write definition of osmoregulation.
(2 marks)
Q2(ii)
What are Malpighian tubules?
(2 marks)
Q2(iii)
How kidney stones are removed from body without surgery?
(2 marks)
Q2(iv)
Compare Hyponasty with Haptonasty.
(2 marks)
Q2(v)
What is structure and chemical composition of Exoskeleton?
(2 marks)
Q2(vi)
What is Spondylosis?
(2 marks)
Q2(vii)
How pollen tube is important for plants?
(2 marks)
Q2(viii)
What are fraternal twins or triplets?
(2 marks)
Q2(ix)
What are the soil conditions in grassland ecosystem?
(2 marks)
Q2(x)
Differentiate between Alpine & Boreal Forest.
(2 marks)
Q2(xi)
How soil plays vital role for organisms?
(2 marks)
Q2(xii)
Acid rain is harmful. Why?
(2 marks)
Q3
Attempt any eight parts.
Q3(i)
Describe briefly the role of Hindbrain.
(2 marks)
Q3(ii)
Give chemical classification of Hormones.
(2 marks)
Q3(iii)
What is Latent learning? Give an example.
(2 marks)
Q3(iv)
Describe Testicular feminization syndrome.
(2 marks)
Q3(v)
Write a short note on Over Dominance.
(2 marks)
Q3(vi)
Why was test cross devised by Mendel?
(2 marks)
Q3(vii)
Define Plasmids. How were they discovered?
(2 marks)
Q3(viii)
Discuss advantages of PCR.
(2 marks)
Q3(ix)
How is SCID treated by Ex-vivo gene therapy in humans?
(2 marks)
Q3(x)
Differentiate between hydrosere and xerosere.
(2 marks)
Q3(xi)
What is the importance of Decomposers?
(2 marks)
Q3(xii)
Why secondary succession is rapid than primary succession?
(2 marks)
Q4
Attempt any six parts.
Q4(i)
How Apical Meristem differs from intercalary meristem?
(2 marks)
Q4(ii)
What is primitive streak?
(2 marks)
Q4(iii)
Write the structure of a Nucleosome.
(2 marks)
Q4(iv)
What is Alkaptonuria? Write its causes.
(2 marks)
Q4(v)
Is Interphase a resting phase? Why?
(2 marks)
Q4(vi)
Differentiate between Mitosis of animals and plants.
(2 marks)
Q4(vii)
Give events of semi-conservative model.
(2 marks)
Q4(viii)
What is the concept of Neo-Darwinism?
(2 marks)
Q4(ix)
What are hydrothermal vents? How do they support life?
(2 marks)

SECTION-II

NOTE: Attempt any three questions.

Q5
(8 marks)
1. (a)
  Describe the structure of Nephron in detail.
  (4 marks)
2. (b)
  Define Meiosis. Explain its significance.
  (4 marks)
Q6
(8 marks)
1. (a)
  What is Locomotion? Explain it with example of Paramecium.
  (4 marks)
2. (b)
  Explain Biogeochemical Cycles with an example of Nitrogen Cycle.
  (4 marks)
Q7
(8 marks)
1. (a)
  Give a flow chart showing classification of Nervous System of Man.
  (4 marks)
2. (b)
  What are Endangered Species? Give your suggestions for their preservation.
  (4 marks)
Q8
(8 marks)
1. (a)
  Discuss the role of Phytochrome in Photoperiodism.
  (4 marks)
2. (b)
  State law of Segregation. Explain it with one suitable example.
  (4 marks)
Q9
(8 marks)
1. (a)
  What are Restriction Endonucleases? Describe their role in Biotechnology.
  (4 marks)
2. (b)
  Discuss the phases of growth in a multicellular plant.
  (4 marks)

Original source references (5)

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

Objective · 4461 · Printed marks: 17 · Time: 20 Minutes
Objective · 4463 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4465 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4467 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · 27 · Printed marks: 68 · Time: 2.40 Hours