PUNJAB PUBLIC SERVICE COMMISSION
Combined Competitive Examination (CCE) 2020
For Recruitment to the Posts of Provincial Management Service (PMS)
SUBJECT: Botany (Paper-1)
Time Allowed: 3 Hours
Maximum Marks: 100
Attempt FIVE questions in all. Attempt in Urdu or English.
Q. No. 1:
a) Discuss the economic importance of Cyanophyta.
b) Write a note on distribution and general characteristics of Phaeophytes.
(10 + 10 = 20 Marks)
Q. No. 2:
a) Describe the structure of a fungus. How is a fungal body different from a plant?
b) Describe the importance of fungi for mankind.
(10 + 10 = 20 Marks)
Q. No. 3:
a) Write a note on the evolution of sporophyte in Bryophytes.
b) Describe the differences between liverworts and mosses.
(10 + 10 = 20 Marks)
Q. No. 4:
a) Discuss the characteristic features of Pteridophytes.
b) Write a note on evolution of seed.
(10 + 10 = 20 Marks)
Q. No. 5:
a) Describe the evolutionary tendencies of Cycadophytes.
b) Write a note on life history of conifers.
(10 + 10 = 20 Marks)
Q. No. 6:
a) Describe the rules of plant nomenclature.
b) Write a note on importance of botanic gardens.
(10 + 10 = 20 Marks)
Q. No. 7:
a) Give the structure and function of epidermal hairs and bulliform cells.
b) Write a note on abnormal secondary growth in dicots.
(10 + 10 = 20 Marks)
Q. No. 8:
a) What is polyembryony? Give its types and practical significance in plants.
b) Explain the development of microgametophyte and male gametes in angiosperms.
(10 + 10 = 20 Marks)
SUBJECT: Botany (Paper-II)
Time Allowed: 3 Hours
Maximum Marks: 100
Note: Attempt FIVE questions, including at least ONE question from each section. Attempt in Urdu or English.
SECTION – I
Q. No. 1:
a) Define photoperiodism. Classify plants on the basis of photoperiodism with concept of critical day length and role of phytochromes.
b) Discuss various types of photosynthetic pigments. Give detail of chemistry of chlorophyll with structural formula.
(10 + 10 = 20 Marks)
Q. No. 2:
a) Describe auxins regarding their mode of action, effects and applications in agriculture.
b) What are enzymes? Explain their chemical nature and mechanism of action with models and enzyme kinetics.
(10 + 10 = 20 Marks)
SECTION – II
Q. No. 3:
a) Discuss eco-physiological responses of plants to light and effects of temporal and spatial variations.
b) Differentiate between trophic level and ecological pyramid. Describe types of ecological pyramids.
(10 + 10 = 20 Marks)
Q. No. 4:
a) Write a note on Himalayan moist temperate forest with characteristics and location in Pakistan.
b) What is conservation of natural resources? Discuss issues and strategies in Pakistan.
(10 + 10 = 20 Marks)
SECTION – III
Q. No. 5:
a) Write a note on cytoskeleton and its role in movement.
b) Differentiate between cytokinesis and karyokinesis with reference to mitosis.
(10 + 10 = 20 Marks)
Q. No. 6:
a) Write notes on nuclear envelope and Golgi apparatus.
b) Explain meiosis as reductional and equational division with Prophase I events.
c) Differentiate apoptosis and necrosis.
d) What is cancer? Discuss causes and control.
(4 × 5 = 20 Marks)
SECTION – IV
Q. No. 7:
a) Differentiate between linkage and crossing over. Construct three-point linkage map with example.
b) Explain transcription and its differences in prokaryotes and eukaryotes.
(10 + 10 = 20 Marks)
Q. No. 8:
a) Explain fine structure of gene in eukaryotes.
b) Write short notes on:
i) Genetic code
ii) Autopolyploidy and Allopolyploidy
(10 + 10 = 20 Marks)
SECTION – V
Q. No. 9:
a) Explain evidences in favour of evolution by natural selection with examples.
b) Define Hardy-Weinberg law and factors affecting allele frequency.
(10 + 10 = 20 Marks)
Q. No. 10:
a) Compare Lamarckism and Darwinism. Explain giraffe evolution according to both.
b) Define adaptive mutations and explain with experiments in E. coli.
(10 + 10 = 20 Marks)
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