Federal Board HSSC-II 2013
BIOLOGY HSSC-II
SECTION — A
(Marks 17)
Time allowed 25 Minutes
Marks: 17
NOTE: Section-A is compulsory. All parts of this section are to be answered on the question paper itself. It should be completed in the first 25 minutes and handed over to the Centre Superintendent Deleting/overwriting is not allowed. Do not use lead pencil.1 Circle the correct option i.e. A / B / C/.D. Each part carries one mark.

Question#1

• Which of the following animals fits into the category of Digitigrade mammals?
  
  a) Monkey
  b) Deer
  c) Goat
  d) Rabbit
  
  
• The annual rainfall in a temperate deciduous forest is about:
  
  a) 250-750 mm
  b) 600-750 mm
  c) 750-1500 mm
  d) 750-1550 mm
  
  
• Who proposed the term Niche?
  
  a) Charles Eton
  b) Joseph Grinnell
  c) Charless Lyll
  d) Ernst Hackel
  
  
• During which phase of Interphase is the number of chromosomes doubled?
  
  a) G₁Phase
  b) G₂ Phase
  c) G₀Phase
  d) S Phase
  
  
• Basking of Lizard in the sun to gain heat is an example of
  
  a) Structural adaptations
  b) Behavioural adaptations
  c) Physiological adaptations
  d) Ecological adaptations
  
  
• The maximum speed of nerve impulse in humans is
  
  a) 100 m/s
  b) 110 m/s
  c) 120 m/s
  d) 130 m/s
  
  
• Which part of the brain is involved in the feelings of fear and rage?
  
  a) Hippocampus
  b) Amygdala
  c) Hypothalamus
  d) Medulla
  
  
• Which meristematic tissue plays an important role in the production of leaves and flowers?
  
  a) Apical meristems
  b) Intercalary meristems
  c) Lateral meristems
  d) Intermediate meristems
  
  
• Excess melanophore stimulating hormone (MSH) is produced in .
  
  a) Addison's disease
  b) Graves disease
  c) Goiter
  d) Diabetes mellitus
  
  
• Diploid number of chromosome in sugar cane is….
  
  a) 80
  b) 20
  c) 26
  b) 40
  
  Which of the following is a stop codon?
  
  a) UUG
  b) UGA
  c) UCA
  d) UAC
  
  
• Different alleles of a gene that are both expressed in heterozygous condition are called…..
  
  a) Codominant
  b) Complete dominance
  c) Over dominance
  d) incomplete dominance
  
  
• Which of the conditions is red colour blindness?
  
  a) Protanopia
  b) Deuteranopia
  c) Tritanopia
  d) Metanopia
  
  
• Which of the following is Incorrectly matched?
  
  a) Protoplast - piant cell engineering
  b) RFLPS - DNA finger printing
  c) DNA polymerase - PCR
  d) DNA ligase - mapping human chromosomes
  
  
• The ozone layer extends about____above the earth.
  
  a) 10 - 50 km
  b) 10 - 40 km
  c) 10 - 30 km
  d) 10 - 60 km
  
  
• Hardy-Weinberg equation is used fo…..
  
  a) Establishing dominant gene in a population
  b) Calculating recessive alleles in a population
  c) Calculating the frequency of alleles in population
  d) None of these

Section-II

2. Attempt any Fourteen parts. 42
Note:The answer to each part should not exceed 3 to 4 lines

• Draw a labeled diagram of a Sensory neuron.
  a) What is a Reflex arc?
• "Nature of excretory products is related to habitats". Justify the statement.
• Secondary function of gonads is to act as an endocrine gland.
  (a) Write an account of the ovary as an endocrine gland.
• What is Test cross? Also write its significance.
• Define the following;
  a) Karyotype
  b) Nucleosome
  c) Nucleotide
• Define a Joint. Name the types of Synovial joints.
• What is the function of DNA polymerase III?
• What do you mean by Non-disjunction of chromosomes?
  a) Briefly write about Turner's syndrome.
• Differentiate between Tetany and Tetanus.
• What is the role of comparative embryology and molecular biology as evidences of evolution?
• Write briefly about the Littoral and Limnetic Zones of Lake Ecosystem.
• Define Acid rain. Also write its harmful effects.
• Write down the commercial applications of Auxins and Gibberellins.
• Write briefly about Apical dominance. How is it important?
• What are the causes and symptoms of Gonorrhoa and Syphilis
• Draw Urea Cycle
  a) Give any two functions of Liver in relation to homeostasis.
• Write the contribution of the following biologists:
  a) Frederick Griffith
  b) Erwin Chargaff
  c) Watson and Crick
• How does Hypothalamus regulate homeostatic function by feedback mechanism?
• How can we get the gene of interest?

Section-III

Attempt any Two questions. 26
Question#3
(a) Explain sliding filament model of muscle contraction How are the bridges controlled? 9
(b) Explain Rh Blood group system. 4

Question#4
(a) Define Biogeocnemical cycle Also explain Nitrogen cycle. 6
(b) Write about Symbiosis and Mutualism . Explain the structure and function of a Nephron. How is concentration of excretory product maintained.5