SAHIWAL BOARD 2017
(Objective Type)
Biology
Time Allowed: 20 Minutes
Maximum Marks: 17
NOTE: You have four choice for each objective type question as A. B. C and D. The choice which you think is correct, fill that circle in front of that question number. Use marker or pen to fill the circle. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type questions papers and leave others blank. No credit will be awarded in case. BUBBLE are not filled. Do not solve questions on this sheet of OBJECTIVE PAPER.

• Phytophthora infestans belongs to the group:
  
  (A) myxomycota
  (B) omycotes
  (C) euglenoids
  (D) rhodophyt


• Pill are made up of special protein called
  
  (A) flagellin
  (B) pili
  (C) tubulin
  (D) myosin


• HIV belongs to the group of viruses called
  
  (A) pox virus
  (B) DNA virus
  (C) retro virus
  (D) bacteriophage


• The process of taking in liquid material by cell membrane is called
  
  (A) phagocytosis
  (B) exocytosis
  (C) pinocytosis
  (D) lymphocytosis
• The optimum temperature for the enzymes of human body is
  
  (A) 25°C
  (B) 37°C
  (C) 40°C
  (D) 45°C


• The melting point of palmitic acid is
  
  (A) -8°C
  (B) 34°C
  (C) 63.1°C
  (D) 55.6° C


• A group of living organism of the same species located in the same place and time is called.
  
  (A) population
  (B) community
  (C) individual
  (D) biome


• Which one of the following is not cell but the fragment of large cells
  
  (A) basophils
  (B) leucocytes
  (C) platelets
  (D) erythrocytes


• Loss of liquid water through secreting glands or hygathodes is called
  
  (A) transpiration
  (B) evaporation
  (C) guttation
  (D) imbibition


• Emphysema is a disease caused by the breakdown of
  
  (A) lungs
  (B) trachea
  (C) bronchi
  (C) alveoli


• The term employed to the loss of appetite due to the fear of becoming obese is
  
  (A) bulimia nervosa
  (B) anorexia nervosa
  (C) botulism
  (D) obesity


• Photosynthetic pigments organized into clusters are called
  
  (A) thylakoids
  (B) photosystems
  (C) granna
  (D) stroma


• The moment in plants when carbon dioxide released by respiration equals the quantity required by photosynthesis is termed as
  
  (A) compensation point
  (B) homeostasis
  (C) chemiosmsis
  (D) action spectrum


• Organ of voice in birds is called
  
  (A) syrinx
  (B) larynx
  (C) tongue
  (D) pharynx


• Colonial coelenterates such as corals produce hard exoskeleton formed of
  
  (A) NaCO₃
  (B) CaCO₃
  (C) NaOH
  (D) CaOH


• In mosses, archegonia and antheridia mixed with sterile hairs are called
  
  (A) mycelium
  (B) paraphyses
  (C) hyphae
  (D) trichomes


• Loose smut of wheat is caused by the following fungi
  
  (A) puccinia
  (B) penicillium
  (C) aspergillus
  (D) ustilago

(Subjective Type)
Time 2.40 Hours
Group-I
Maximum Marks: 68

NOTE: - Write same question number and its part number on answer book, as given in the question paper.
2. Attempt any eight parts.

1. What is phosphodiester linkage? Sketch.
   
2. Differentiate between competitive and non-competitive inhibitors.
   
3. Write down the eftect of high temperature on an enzyme.
   
4. What is co-factor? Give its importance.
   
5. Write two difference between spores and conidia.
   
6. What is the importance of mycorrhizae for plants?
   
7. Differentiate between sac like and tube like digestive system.
   
8. How does transport of gases may take placed in arthopods?
   
9. Give the names of four harmful insects.
   
10. Give three basic characteristics of chordates.
    
11. Define bio energetics. Does it obey the. Law of thermodynamics?
    
12. What is compensation point? What does it indicate?

3. Write short answers of any eight parts from the following.

1. Differentiate between cristae and cistemae.
   
2. What are storage diseases? Give name of two storage diseases in man.
   
3. What do you mean by integrated disease management?
   
4. Define bioremediation and endangered species.
   
5. Name six group of animal like protists.
   
6. What is chlorella and give its importance?
   
7. What are diatoms? Clive their importance.
   
8. Differentiate between Fungi and fungi like protists.
   
9. Differentiate between microphylls and megaphylls.
   
10. Define double fertiliiation in angiosperm.
    
11. Differentiate between pulmonary circulation and systemic circulation.
    
12. What are blue babies?

4. Write short answer of any six question

1. What are prions?
   
2. Differentiate between hormogonia and akinetes.
   
3. Differentiate between detritivores and omnivours?
   
4. How the secretions of gastric juice are regulated?
   
5. What is botulism? How is it caused?
   
6. What is mechanism of inhalation of air in man?
   
7. Differentiate between Spiracles and tracheoles?
   
8. Enlist properties of respiratory surface in animals.
   
9. Why air is better respiratory medium than water?

SECTION-II

NOTE: - Attempt any three questions.
Q5:(a) Write a note on cloning.
(b) Explain pressure flow theory for translocation of food in plants.

Q6: (a) Discuss primary and secondary structure of proteins.
(b) Write a note on digestion in cockroach.

Q7: (a) Write a detailed note on chromosomes.
(b) Write a note on structure of chlorophyll.

Q8: (a) Explain structure of virus.
(b) Give economic importance of family poacae.

Q9: (a) Give an account of growth and reproduction in bacteria.
(b) Describe and sketch the life cycle of rhizopus.