PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION FOR
RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE-2022
BOTANY (PAPER-II)
TIME ALLOWED: THREE HOURS
MAXIMUM MARKS: 100
NOTE:
1. All the parts (if any) of each Question must be attempted at one place instead of at different places.
2. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
3. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
4. Extra attempt of any question or any part of the question will not be considered.
NOTE: Attempt FIVE Questions. Attempt in Urdu or English.
Q. No. 1
a) Explain in detail how does the process of glycolysis help in the conversion of hexoses into pyruvic acid?
b) Describe Formation of acetyl coenzyme A.
c) Discuss energy transformation in respiration.
(10+5+5=20 Marks)
Q. No. 2
a) Write the mechanism of Electron Transport System (ETS) in respiration process.
b) Differentiate among C3, C4 and CAM Plants.
(10+10=20 Marks)
Q. No. 3
a) Discuss the role of edaphic and climatic factors on plant growth.
b) Discuss briefly the following ecosystems:
i). Wetlands
ii). Mangroves
(10+10=20 Marks)
Q. No. 4
Differentiate between the following:
a) Glyoxisomes and peroxisomes.
b) Chromoplast and leucoplast.
c) Primary cell wall and secondary cell wall.
d) Smooth endoplasmic reticulum and rough endoplasmic reticulum.
(5X4=20 Marks)
Q. No. 5
Describe the similarities and differences between RNA and DNA. Also discuss the three main types of RNA used in protein synthesis.
(20 Marks)
Q. No. 6
Explain the process of linkage. Also differentiate between the following:
i) Test cross vs Back cross
ii) Monohybrid cross vs Dihybrid cross
(20 Marks)
Q. No. 7
a) What do you understand by Lamarckism? Discuss its all points, including the example of long neck and legs of giraffe along with other examples.
b) Differentiate between microevolution and macroevolution.
(15+5=20 Marks)
Q. No. 8
How is random mutation hypothesis different from adaptive mutation hypothesis? Elaborate with suitable examples.
(20 Marks)
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