BISE Multan · Class 12 · Biology

BISE Multan · Class 12 · Biology · 2025 · First Annual · Group 1

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: 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)
$\underline{}$ is not the adaptation of xerophytes.
- (A)
  Small thick leaves
- (B)
  Stomata in depressions
- (C)
  Thick waxy cuticle
- (D)
  Stomata on the upper surface of leaves
Q1(2)
Sclereides are most probably found in:
- (A)
  Xylem
- (B)
  Nut shells
- (C)
  Bundle cap
- (D)
  Stem cortex
Q1(3)
$\underline{}$ event does not occur during muscle contraction.
- (A)
  I-bands shorten
- (B)
  Z-lines get closer
- (C)
  A-bands reduce in length
- (D)
  H-zones disappear
Q1(4)
The type of receptors which produce sensation of pain are:
- (A)
  Nociceptors
- (B)
  Thermoreceptors
- (C)
  Photoreceptors
- (D)
  Pacinian corpuscles
Q1(5)
Over secretion of cortical hormones may cause the disease:
- (A)
  Addison’s disease
- (B)
  Cushing’s disease
- (C)
  Grave’s disease
- (D)
  Diabetes mellitus
Q1(6)
During vernalisation, low temperature stimulus in the seeds is received by:
- (A)
  Leaves
- (B)
  Shoot apex
- (C)
  Embryo
- (D)
  Roots
Q1(7)
$\underline{}$ organ of the plant shows indeterminate growth.
- (A)
  Leaves
- (B)
  Fruits
- (C)
  Flowers
- (D)
  Stem (vegetative)
Q1(8)
$\underline{}$ is not a non sense codon.
- (A)
  AUG
- (B)
  UAA
- (C)
  UAG
- (D)
  UGA
Q1(9)
Which type of chromosomes do not possess arms on one side of the centromere?
- (A)
  Metacentric
- (B)
  Acrocentric
- (C)
  Telocentric
- (D)
  Sub metacentric
Q1(10)
The phase of Meiosis which is considered as a reduction phase:
- (A)
  Telophase I
- (B)
  Anaphase II
- (C)
  Metaphase I
- (D)
  Anaphase I
Q1(11)
An organism has four pair of homologous chromosomes, how many linkage groups does this organism possess?
- (A)
  2
- (B)
  4
- (C)
  1
- (D)
  8
Q1(12)
What will be the best tissue culture technique to produce plants homozygous for all their alleles?
- (A)
  Anther culturing
- (B)
  Cell suspension culturing
- (C)
  Protoplast culturing
- (D)
  Meristem culturing
Q1(13)
In recombinant DNA technology, bacterial cells can be made more permeable for recombinant plasmids, if they are treated with:
- (A)
  Sodium chloride
- (B)
  Cesium chloride
- (C)
  Calcium chloride
- (D)
  Potassium chloride
Q1(14)
$\underline{}$ is not the part of Darwinism.
- (A)
  Over production
- (B)
  Struggle for survival
- (C)
  Variations
- (D)
  Use and disuse of parts
Q1(15)
The oxidation of ammonia or ammonium ions is termed as:
- (A)
  Nitrification
- (B)
  Assimilation
- (C)
  Denitrification
- (D)
  Ammonification
Q1(16)
The zone of lake ecosystem where light does not penetrate:
- (A)
  Limnetic zone
- (B)
  Littoral zone
- (C)
  Profundal zone
- (D)
  Both littoral and Limnetic
Q1(17)
$\underline{}$ is a water pollution.
- (A)
  Ozone depletion
- (B)
  Eutrophication
- (C)
  Acid rains
- (D)
  Greenhouse effect

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)
How excess salts are excreted by fishes living in marine water?
(2 marks)
Q2(ii)
Compare hydrophytes with xerophytes.
(2 marks)
Q2(iii)
Enlist main types of kidney stones.
(2 marks)
Q2(iv)
Write down the ultra structure of thin muscle filament.
(2 marks)
Q2(v)
Give briefly the mechanism of movement of cilia.
(2 marks)
Q2(vi)
Differentiate between Epinasty and hyponasty.
(2 marks)
Q2(vii)
What is seed dormancy? How it is helpful for a plant?
(2 marks)
Q2(viii)
What is apomixes?
(2 marks)
Q2(ix)
Define Eutrophication. Give its two disadvantages.
(2 marks)
Q2(x)
Differentiate between alpine and boreal forests.
(2 marks)
Q2(xi)
How acid rains are harmful for an ecosystem?
(2 marks)
Q2(xii)
Why forests are called environmental buffers?
(2 marks)
Q3
Attempt any eight parts.
Q3(i)
Define Receptors. List different types of receptors.
(2 marks)
Q3(ii)
Write two commercial applications of Gibberellin.
(2 marks)
Q3(iii)
Name the hormones of adrenal medulla with function.
(2 marks)
Q3(iv)
What is meant by MODY? Write its one cause.
(2 marks)
Q3(v)
A normal woman whose father was red blind marries a red blind man. What proportion of their children can have normal colour vision?
(2 marks)
Q3(vi)
Differentiate between Homozygous and Heterozygous.
(2 marks)
Q3(vii)
What is gene pharming? Give example.
(2 marks)
Q3(viii)
How complementary DNA are formed?
(2 marks)
Q3(ix)
Name the diseases whose antibody are made from transgenic corn and soyabeen.
(2 marks)
Q3(x)
Summarize your understanding about root nodule during symbiotic association.
(2 marks)
Q3(xi)
Compare ectoparasite with endoparasite.
(2 marks)
Q3(xii)
Write same lines about crustose lichen stage of Xerosere.
(2 marks)
Q4
Attempt any six parts.
Q4(i)
Write the role of hormones in apical dominance.
(2 marks)
Q4(ii)
What was the conclusion of experiment of Hans Dietrisch (1892)?
(2 marks)
Q4(iii)
Give the information found in a typical chromosome of homo sepiens.
(2 marks)
Q4(iv)
Give the role of ligase in DNA replication.
(2 marks)
Q4(v)
Write down the structural formulas of both the purines bases found in DNA.
(2 marks)
Q4(vi)
What is mitotic apparatus? Give its importance.
(2 marks)
Q4(vii)
Fertility of a woman is affected with age in terms of genetic disorders. How?
(2 marks)
Q4(viii)
Write the contribution of Lynn Margulis in evolution.
(2 marks)
Q4(ix)
Differentiate the homologous and analogous organs.
(2 marks)

SECTION-II

NOTE: Attempt any three questions.

Q5
(8 marks)
1. (a)
  Describe various adaptations in plants to cope with low and high temperatures.
  (4 marks)
2. (b)
  Compare mitosis with meiosis and describe their importance.
  (4 marks)
Q6
(8 marks)
1. (a)
  What is secondary growth? Explain the role of vascular cambium and cork cambium in secondary growth
  (4 marks)
2. (b)
  What is the nitrogen cycle? How does it regulate nitrogen availability in ecosystems?
  (4 marks)
Q7
(8 marks)
1. (a)
  Compare nervous system of planaria with nervous system of hydra.
  (4 marks)
2. (b)
  Briefly discuss Darwin’s theory of evolution.
  (4 marks)
Q8
(8 marks)
1. (a)
  Describe menstrual cycle in human female.
  (4 marks)
2. (b)
  Write an explanatory note on Rh blood group system.
  (4 marks)
Q9
(8 marks)
1. (a)
  Describe the process of Aging. How it is slowed down?
  (4 marks)
2. (b)
  Provide a detailed overview of PCR technique and its procedure.
  (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