SAHIWAL BOARD
Biology
(Session: 2015)
Class – 2nd Year
Time: 20 Minutes
(OBJECTIVE)
Marks: 20
Note: Write answers to the questions on objective answer sheet provided. Four possible answers A, B, C,D to each question are given. Which answer you consider correct, fill the corresponding circle A, B, C or D given in front of each question with Marker or pen ink on the answer sheet provided.

Question#1

• Aldosterone helps in the active uptake of
  
  (A) Potassium
  (B) Sodium
  (C) Calcium
  (D) Phosphorus
  
  
• With each cardiac beat, kidneys receive blood
  
  (A) 1%
  (B) 5%
  (C) 15%
  (D) 20%
  
  
• Which bone provides attachment site for muscles?
  
  (A) Compact bone
  (B) Spongy bone
  (C) Cartilage
  (D) Soft bone
  
  
• Rickets is due to deficiency of vitamin D and
  
  (A) Magnesium
  (B) Calcium
  (C) Phosphorus
  (D) Iodine
  
  
• Gibberellins are produced commercially from
  
  (A) Plants
  (B) Fungi"
  (C) Bacteria
  (D) Made chemically
  
  
• Sertoli cells are cells of
  
  (A) Testes
  (B) Ovaries
  (C) Urethra
  (D) Bladder
  
  
• Human gestation period is of
  
  (A) 280 days
  (B) 28 days
  (C) 3-7 days
  (D) 4 months
  
  
• Study of aging Is called:
  
  (A) Embryology
  (B) Teratology
  (C) Serology
  (D) Gerontology
  
  
• Which standard of DNA elongates towards the replication fork?
  
  (A) Parent strand
  (B) Leading strand
  (C) Lagging strand
  (D) Sense strand
  
  
• Period of non-apparent division is called:
  
  (A) Cell cycle
  (B) Inter phase
  (C) Mitotic phase
  (D) Meiosis
  
  If mother's age is above 45 years, then ratio of Down's syndrgme is:
  
  (A) 1/1000
  (B) 3/1000
  (C) 1/100
  (D) 3/100
  
  
• The blood serum containing antibodies is called:
  
  (A) Lymph
  (B) Plasma
  (C) Antiserum
  (D) Antigen
  
  
• Plasmid p" sea has antibiotic resistance gene for:
  
  (A) Tetracycline
  (B) Ampicillin
  (C) Tetracycline and ampicillin
  (D) Penicillin
  
  
• Most fossils are found in:
  
  (A) Ice
  (B) Stony rock
  (C) Mud
  (D) Sedimentary rock
  
  
• A predator is a:
  
  (A) Producer
  (B) Consumer
  (C) Decomposer
  (D) Reducer
  
  
• Northern coniferous forests are called:
  
  (A) Tundra
  (B) Taiga
  (C) Alpine
  (D) Boreal
  
  
• The chemical waste from industry is called:
  
  (A) Pollution
  (B) Effluent
  (C) Toxins
  (D) Pollutant

SAIIIWAL BOARD
BIOLOGY
(Session: 2015)
Glass-2nd Year
Time: 2: 10 Hours
(SUBJECTIVE)
Marks: 80
Note: Section I is compulsory. Attempt any Three questions from Section II and any Two parts from Section III.
SECTION-I

2. Write short answers to any Eight questions.(2*8=16)

• What is vasa recta?
• What changes will occur in a cell when placed in hypotonic solution.
• Differentiate between Ectotherms and Endotherms.
• What are haptonastic movements? Give example.
• Describe briefly about sciatica.
• Write two differences between bone and cartilage
• Differentiate between growth and development.
• What is metastasis?
• Define mitosis.
• What is the cause of Down's syndrome?
• What is New Darwinism?
• Name four factors affecting gene frequency

3. Write short answers to any eight questions. (2*8=16)

• What are modalities of sensation?
• Define reflex are and give its components.
• How Ca' concentration in human blood is regulated?
• Define phytochromes and give its types.
• Differentiate between identical and fraternal twins.
• What are sertoli cells, give their role?
• Define genomic library, how it can be made?
• Give briefly the application of PCR amplification and analysis.
• What is difference between alpine and boreal forests?
• What are graminoids, in which biome they exist?
• Define eutrophication.
• What is tone cancer, give its causes?