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) Explain thallus organization and reproduction in Chlorophyta.
b) Give phylogeny (origin and classification) of Ascomycetes.
(10 + 10 = 20 Marks)
Q. No. 2:
a) Write a note on loose smut of wheat and its control measures.
b) Give auxospore formation and economic importance of diatoms.
(10 + 10 = 20 Marks)
Q. No. 3:
a) Mention general characteristics of Ginkgophyta.
b) Discuss comparison of plant body structure of Lycophyta with Psilophyta.
(10 + 10 = 20 Marks)
Q. No. 4:
a) Write a note on phylogeny of Cycads.
b) Explain heterospory and highlight its importance as a step towards seed habit.
(10 + 10 = 20 Marks)
Q. No. 5:
a) Discuss natural system of classification including its outline, merits and demerits.
b) Explain anatomy of bifacial and isobilateral leaves with reference to dermal, ground and vascular systems.
(10 + 10 = 20 Marks)
Q. No. 6:
a) Explain endosperm with reference to its types and nature.
b) Give structure, chemical composition and ultrastructure of plant cell wall.
(10 + 10 = 20 Marks)
Q. No. 7:
a) Write a detailed note on structure and function of sclerenchyma.
b) Differentiate between primary and secondary growth. Elaborate secondary growth in dicot stem with diagrams.
(10 + 10 = 20 Marks)
Q. No. 8:
Write short notes on the following:
i) Monocot stem and dicot stem
ii) Monocot root and dicot root
iii) Apomixis
iv) Polyembryony
(4 × 5 = 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) How do roots of vascular plants absorb water from soil?
b) Discuss energy balance of respiration (ATP yield per molecule of glucose).
c) What are physiological effects of ethylene on plants?
d) Write a note on nature of enzymes.
(5 × 4 = 20 Marks)
Q. No. 2:
a) Define vernalization. Discuss mechanism and factors required.
b) What is seed dormancy? How can it be broken?
(10 + 10 = 20 Marks)
SECTION – II
Q. No. 3:
a) Discuss soil erosion by water and its control measures.
b) Define water logging. Effects on plant growth and reclamation methods.
(10 + 10 = 20 Marks)
Q. No. 4:
a) Give detailed account of grassland ecosystem and productivity.
b) Write short notes on any TWO:
i) Acid rain
ii) Global warming
iii) Photochemical smog
iv) Eutrophication
(10 + 10 = 20 Marks)
SECTION – III
Q. No. 5:
a) Describe mitosis in plant cells with diagrams.
b) Differentiate: mitosis vs meiosis, cytokinesis vs karyokinesis.
(10 + 10 = 20 Marks)
Q. No. 6:
a) Describe plasma membrane structure with diagrams.
b) Differentiate:
i) Hypertonic vs hypotonic solution
ii) Pinocytosis vs phagocytosis
iii) Exocytosis vs endocytosis
iv) Active transport vs simple diffusion
v) Primary vs secondary lysosomes
(10 + 10 = 20 Marks)
SECTION – IV
Q. No. 7:
a) What are types of RNA? Discuss structure and role in translation.
b) Define mutation. Types of point mutations and causes.
(10 + 10 = 20 Marks)
Q. No. 8:
a) What is sex linkage? Explain X-linked inheritance with examples.
b) Write short notes on:
i) Barr bodies
ii) Post-transcriptional changes in mRNA
(10 + 10 = 20 Marks)
SECTION – V
Q. No. 9:
a) What is organic evolution? Explain contributions of Uniformitarianism and Malthus to Darwin’s theory.
b) Write notes on:
i) Neo-Darwinism
ii) Adaptive radiation
(10 + 10 = 20 Marks)
Question 10:
a) What is the theory of inheritance of acquired characteristics and how did Lamarck use it to explain the phenomenon of evolution?
b) What are the four assumptions of Hardy-Weinberg law? How do the allelic frequencies of a population change? Explain with some suitable examples.
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