SAHIWAL BOARD 2016
PAPER BIOLOGY PART-II
Time: 20 Min.
(Objective Part)
Marks: 17
Note: You have four choice for each objective type question as A, B, C and The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

Question#1

• Environmental factors causing abnormal development are grouped together as:
  
  (a) Toxins
  (b) Carcinogens
  (c) Mutagens
  (d) Teratogens
  
  
• The particular array to chromosomes that an individual possesses is called its:
  
  (a) Kinesis
  (b) Karyotype
  (c) Kinetochore
  (d) Kinetomere
  
  
• In the case of human cell, average cell cycle is about.
  
  (a) 24 hours
  (b) 26 hours
  (c) 28 hours
  (d) 30 hours
  
  
• The pairing of homologous chromosomes is completed in:
  
  (a) Leptotene
  (b) Zygotene
  (c) Pachytene
  (d) Diplotene
  
  
• The true color blindness is:
  
  (a) Monochromacy
  (b) Dichromacy
  (c) Trichromacy
  (d) Tetrachromacy
  
  
• Urine is preferable vehicle for a biotechnology product than.
  
  (a) Milk
  (b) Blood
  (c) Plasma
  (d) Tissue fluid
  
  
• Endangered species of plants have been recorded to more than:
  
  (a) 300
  (b) 400
  (c) 500
  (d) 600
  
  
• Diseases in living organisms caused by parasites are called:
  
  (a) Plaques
  (b) Infestations
  (c) Influxes
  (d) Swarms
  
  
• Fresh water ecosystem covers less than.
  
  (a) 7 %
  (b) 5 %
  (c) 3 %
  (d) 1 %
  
  
• A treasure of all types of resources essential to maintain life on earth is:
  
  (a) Environment
  (b) Water
  (c) Land
  (d) Sun
  
  
• Non-surgical removal of kidney stone is called:
  
  (a) Dialysis
  (b) Lithotripsy
  (c) Uremia
  (d) Kidney transplant
  
  
• Which part of the plant body serves as excretophore?
  
  (a) Root
  (b) Stem
  (c) Leaves
  (d) Flowers
  
  
• Turgor pressure is generated by high osmotic pressure of the cell.
  
  (a) Cytoplasm
  (b) Vacuole
  (c) Mitochondria
  (d) Chloroplast
  
  
• Which animal moves by jet-propulsion?
  
  (a) Earth warm
  (b) Star fish
  (c) Snail
  (d) Jelly fish
  
  
• The onset of epilepsy is usually before age of:
  
  (a) 10 years
  (b) 20 years
  (c) 30 years
  (d) 40 years
  
  
• Fertilization is the process which leads to the union of:
  
  (a) Individuals
  (b) Gametes
  (c) Sperms
  (d) Eggs
  
  
• P 660 a quiescent absorption of:
  
  (a) Red light
  (b) Blue light
  (c) Yellow light
  (d) Orange light

Section I
SUBJECTIVE TYPE

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

• What is peritoneal dialysis?
• Briefly describe urea cycle.
• Write a short note on kidney transplantation.
• How does tendon differ from ligament?
• Differentiate between sapwood and heartwood.
• What are disadvantages of exoskeleton?
• Define teratology.
• What are intercalary meristems?
• How does cell death help in development of multicellular organisms?
• What is the importance of kinetochore in the alignment of chromosomes during mitosis?
• What is Neo-Darwinism?
• Differentiate between endangered and threatened species.

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

• What is chlorosis?
• Differentiate between chemoreceptors and mechanoreceptors.
• What is a neurotransmitter? Give one example.
• Differentiate between isomorphic and heteromorphic generations.
• Define parthenogenesis.
• What is apomixis?
• What is meant by a genomic library?
• What are bioreactors?
• Differentiate between phytoplanktons and zooplanktons.
• What is layering in grassland ecosystem?
• What are environmental buffers?
• What is meant by biodiversity?

4. Attempt any SIX short questions. (6 x 2 = 12)

• Define and briefly explain the term karyotype.
• What is a nucleosome?
• What is meant by universality of genetic code?
• Define gene and locus.
• Define probability. What is product rule?
• What are pseudoautosomal genes?
• What is commensalism? Give an example?
• (viii) How does over grazing affect a grass land ecosystem?
• (ix) What is autecology?

SECTION - II

Attempt any TIIREE-questions: (8x3=24)
Question#5
(a) Give osmoregulatory adaptations in terrestrial animals.
(b) What is acid rain? How does it affect ecosystems?

Question#6|
(a) Describe the process of repair of broken bones.
(b) Explain factors affecting gene frequency.

Question#7
(a) Define and explain briefly nerve impulse.
(b) Discuss nitrogen depletion and its remedies.

Question#8
(a) Discuss male reproductive system of human being.
(b) Write a note on mutations.

Question#9
(a) Write note on abnormal development.
(b) Explain Mendel's law of independent assortment example.

SECTION-III

Attempt any THREE questions. (5 x 3 = 15)
(a) Sketch and label the nervous system of cockroach.
(b) Sketch and label the forelimb of frog.
(c) Write procedure and observations to study the phenomenon of phototropism in plants.
(d) Write procedure and observations to study the water contents of a soil sample.
(e) Write the short answer of the following questions.

• Define geotropism.
• What is trophic level.
• What is hinge joint?
• What is polytene chromosome?
• What is humus?