SAHIWAL BOARD 2014
PAPER BIOLOGY
PART-II
Time: 20 M.
(Objective Part)
Marks: 17
Note; Four answer are given against each question in columns A, B, C and D. Select the right answer and on the separate Answer Sheet, fill the circle A,B,C or D with pen or marker in front of that question number.

Question#1

• Mitotic apparatus is organized during.
  
  (a) Prophase
  (b) Metaphase
  (c) Anaphase
  (d) Telophase
  
  
• Nucleosome occurs every:
  
  (a) 50 nucleotides
  (b) iu0 nucleotides
  (c) 150 nucleotides
  (d) 200 nucleotides
  
  
• Apical dominance is caused by:
  
  (a) Gibberellins
  (b) Cytokinius
  (c) Ethene
  (d) Auxins
  
  
• Labour pains are induced by:
  
  (a) Progesterone
  (b) Oxytocin
  (c) Corticosteroids
  (d) Estrogen
  
  
• Cause of syphilis is:
  
  (a) Neisseria
  (b) Treponema
  (c) Mycobacterium
  (d) Hiv
  
  
• Which one is not related to others.
  
  (a) Cretinism
  (b) Myxoedema
  (c) Exophthalmic goitre
  (d) Diabetes mellitus
  
  
• Brain is protected by:
  
  (a) Cranium
  (b) Skull
  (c) Orbits
  (d) Zygomatic bone
  
  
• Complete immobilization of muscle leads to:
  
  (a) Increase in capillaries
  (b) Increase in mitochondria.
  (c) Severe atrophy
  (d) Resistance to fatigue
  
  
• Anhydrobiosis refers to tolerate.
  
  (a) Dehydration
  (b) Hydration
  (c) Anhydration
  (d) Rehydration
  
  
• Mechanism which eliminates nitrogenous waste is referred as:
  
  (a) Osmoregulation
  (b) Excretion
  (c) Thermoregulation
  (d) Ejestion
  
  
• Environmental buffers are:
  
  (a) Wild animals
  (b) Abiotic factors
  (c) Forest
  (d) Clouds
  
  
• About this much of the total energy from sun is trapped by the producers in an ecosystem:
  
  (a) 1%
  (b) 2%
  (c) 3%
  (d) 4%
  
  
• Which of the following is drifting animal?
  
  (a) Insect larva
  (b) Protozoa
  (c) Turtle
  (d) Snake
  
  
• Taq polymerase is obtained from:
  
  (a) Fungus
  (b) Algae
  (c) Bacterium
  (d) Virus
  
  
• Book "The origin of species" was written by:
  
  (a) Linnaean
  (b) Darwin
  (c) Lamarck
  (d) Wallace
  
  
• ABO blood group system is encoded by a single polymorphic gene with:
  
  (a) Three multiple alleles
  (b) Four multiple alleles
  (c) Five multiple alleles
  (d) Six multiple alleles
  
  
• Each diploid cell after meiosis produces:
  
  (a) Two cells
  (b) Four cells
  (c) Six cells
  (d) Eight cells

Time: 2:10 11ours
(Subjective Part)
Marks 83
Section-II

2. Attempt any EIGHT short questions. (8x2=16)

• Give the structural formula of uric acid.
• Draw and labelled single flame cell of planaria.
• What is pyrexia?
• Differentiate between sclerenchymatous cell and collenchymatous cell.
• Name bones of human pectoral girdle.
• Differentiate between cartilage and bone.
• How process of aging can be slow down?
• Give length of cell cycle during mitosis in human cell.
• Define non disjunction and give one autosomal example.
• Name two reptiles which have been declared extinct in Pakistan.
• Name factors affecting gene frequency.
• Define endosymbiont hypothesis.

3. Attempt any EIGHT short questions. (8x2=16)

• What are neuroglia? Give their functions.
• What are neurotransmitters? Quote examples.
• Differentiate between gastrin and secretin hormones.
• Define reproduction. What is significance?
• Differentiate between oviparous and viviparous.
• What is genital herpes? (vii) Describe genomic library?
• What is cystic fibrosis?
• Differentiate between phytoplanktons and zooplanktons.
• What are kinds of coniferous forests and where are they located?
• What are pollutants?
• What are renewable resources? Give examples.

4. Attempt any SIX short questions. (6x2=12)

• What is Test Cross? Give its significance.
• What are sex-limited traits? Give example.
• Differentiate between phenotype and genotype.
• Define chromosomal theory of inheritance.
• What is point mutation? Give example.
• Differentiate between Autecology and Synecology.
• Differentiate between heterochromatin and euchromatin.
• What is succession?
• What is mutualism? Give example.

(SECT ION-III)

Attempt any THREE questions. (8x3=24)

Question#5
(a) Explain briefly "Excretion in Planaria". (4)
(b) Write a short note on "Importance of Forests". (4)

Question#6
(a) List some major functions of the skeletal system. (4)
(b) Explain Hardy-Weinberg theorem. (4)

Question#7
(a) Write a note on Thyroid Gland. (4)
(b) Describe the Nitrogen Cycle. (4)

Question#8
(a) Describe the Female reproductive cycle. (4)
(b) How the cells use RNA to make protein? (4)

Question#9
(a) Define Regeneration. Explain it in various groups of animals. (4)
(b) Discuss Genetics of colour-blindness. (4)

SECTION-III

Question#10
(a) Draw a labelled diagram of urinogential system of a male frog.
(b) Sketch labelled diagram of humerous of frog.
(c) Draw stages of mitosis.
(d) Draw and Isbell polytene chromosomes.
(e) Give short answer:
(i) What are mesophytes?
(ii) What is quadrate?
(iii) What is Geotropism?
(iv) Write use of Agar.
(v) What are sex chromosomes?