DG Khan Board 2017
(Objective Type)
Biology
Time Allowed: 20 Minutes
Maximum Marks: 17
Part II
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.

• The most toxic nitrogenous waste in animals is:

(A) Uric acid
(B) Ammonia
(C) Urea
(D) Creatine

• Flame cells are part of excretory system of:

(A) Hydra
(B) Cockroach
(C) Earthworm
(D) Planaria

• The cell wall of scierenchymat cell are usually impregnated with:

(A)  Cutin
(B) Pectin
(C) Suberin
(D) Lignin

• The number of pelvic vertebrae in vertebral column of man is:

(A) 5
(B) 7
(C) 9
(D) 12

• Cell membrane of neuron is slightly permeable to:

(A) K+
(B) Na+
(C) Ca++
(D) Fe++

• A burst of respiratory activity during ripening of fruit is known as:

(A) Parthenogenesis
(B) Climacteric
(C) Fruit set
(D) Apomixis

• The disease caused by a gram positive bacterium Neisseria is called:

(A) Gonorrhea
(B) Syphilis  
(C) Herpes 
(D) AIDS

• The branch of biology which deals with abnormal development Is called:

(A) Tetralogy
(B) Palaeontology
(C) Gerontology
(D) Mythology  

• In bacteria the newly synthesized mRNA is released in;

(A) Nucleus
(B) Cytoplasm
(C) Mitochondria
(D) Nucleolus

• Cancer is caused mainly by mutation in:

(A) Germ cells
(B) Stomatic cell
(C) Epidermal cells
(D) Reproductive cell

• Synapsis takes place in:

(A) Leptotene
(B) Zygotene
(C) Pachytene
(D) Diakinesis

• True colour blindness is called:

(A) Monochromacy
(B) Protanopia
(C) Tritanopia
(D) Myopia

• The coconut milk contains the plant hormone called:

(A) Auxin
(B) Cytokinins
(C) Gibberellins
(D) Abscisic acid

• An example of natural selection in action is evolution of antibiotic resistance in:

(A) Algae
(B) Fungi
(C) Bacteria
(D) Viruses

• Biosphere is spread out over the surface of planet earth extending about:

(A) 3-6 kilometers
(B) 4-8 kilometers
(C) 8-10 kilometers
(D) 8-12 Kilometers

• Arctic tundra stretches across North America, North Europe and:

(A) Siberia
(B) Cyprus
(C) Morocco
(D) Algeria

• Utilization of water in irrigation is:

(A) 70%
(B) 80%
(C) 85%
(D) 90%

DG Khan Board 2017
(Subjective Type)
Time 2.40 Hours
Part II
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.

• What is peritoneal dialysis?
  
• Differentiate between asmoregulation and thermoregulation.
  
• How marine mammals regulate their body temperature?
  
• Define ball and socket joints.
  
• What is pulvinus?
  
• Differentiate between sapwood and heartwood.
  
• What is meant by fruit set?
  
• Define seed dormancy, give its importance.
  
• Name any two zones of fresh water takes.
  
• Differentiate between phytoplanktons and zooplanktons.
  
• Define demography.
  
• Why forests are called environmental buffers?

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

• Write down any four functions of Auxins.
  
• Differentiate active membrane potential from resting membrane potential.
  
• What are neutrotransmitters? Write down the names of any two
  
• Write down few lines about co-dominance.
  
• What is epistasis? Give an example.
  
• Write down testicular feminization syndrome.
  
• What do you know about recombinant DNA technology?
  
• How cancer patients are being treated by gene therapy?
  
• Briefly write down Maxarn Gilibert method of gene sequencing.
  
• What is predation, give its significances?
  
• Define mutualism by giving an example.
  
• Write down few lines on crustose lichen stage.

4. Write short answer of any six question

• What are chromosomal aberrations?
  
• Write down its reasons. Define genetic code. Write its properties.
  
• Define central dogma.
  
• What is difference between inhibitory effect and compensatory effect?
  
• What is difference between area pellucid and area opaca?
  
• Write three importances of mitosis? What is mitotic apparatus? Give its importance.
  
• Only name the factors that effect population.
  
• What are vestigial organs? Give examples.

SECTION-II

NOTE: - Attempt any three questions.

Q5:

1. What is the effect of high and low temperature on plants?
2.  What are biogeochemical cycles? Explain nitrogen cycle.

Q6:

1. Write down the process of ecdysis in Arthropoda.
2. Discuss one gene one polypeptide hypothesis.

Q7:

1.  Write a note on anterior lobe of pituitary gland.
2.  Discuss greenhouse effect and acid rain.

Q8:

1.  Describe the human female reproductive system.
2. What is incomplete dominance? Explain with an example.

Q9:

1. Analyze various factors involved in aging.
2. State Hardy-Weinberg theorem. Discuss any two factors affecting gene frequency.