PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION 2017
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC.
SUBJECT: BOTANY (PAPER-II)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE: Attempt Any FIVE Questions in All. Attempt ONE Question Each from Section 1, 2, 3 and TWO Questions from Section 4. Attempt in Urdu or English.
SECTION-1
Q No. 1: a) Discuss water conservation strategies adopted by a plant in a desert environment for its successful survival. b) Describe the role of macro-nutrients in growth and development of a plant.
c) Define Vernalization and seed dormancy? Discuss in detail the ecological consequences of these phenomena.
d) Write a note on Biochemistry of carbohydrates. (5×4=20 Marks)
Q No.2: a) Write a note on factors affecting photosynthesis in plants.
b) Discuss the mechanism of action and role of ethylene in plants.
c) Write a note on photoperiodism. Discuss commonly occurring short-day, long-day and day neutral plants.
d) Describe the economic importance of secondary metabolites in plants. (5×4=20 Marks)
SECTION-2
Q No. 3: a) Discuss the role of abiotic factors in growth and development of a plant.
b) How can you compare a marine and a forest ecosystem keeping in view their productivity?
c) What is a quadrant method for sampling vegetation? How can you compare this method with other sampling techniques?
d) Discuss the importance ex-situ conservation for rare, threatened and endangered plant species. (5×4=20 Marks)
Q No. 4: a) Discuss different vegetation zones in the Punjab with reference to dominant plant species.
b) Write a note on structural and functional modifications for salinity tolerance In crop species.
c) Discuss the hazardous effects of industrial effluents on native vegetation of the Punjab region
d) What is soil erosion? Discuss its causes and control In Pakistan. (5×4=20 Marks)