PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF PROVINCIAL MANAGEMENT SERVICE -2021
BOTANY (PAPER-I)
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.
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 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 structure of plant body of Lycophyta with that of Psilophyta.
(10+10=20 Marks)
Q. No. 4:
a) Write note on phylogeny of Cycads.
b) Explain Heterospory. Highlight its importance as a step towards seed habit.
(10+10=20 Marks)
Q. No. 5:
a) Discuss Natural system of classification regarding its outline, merits and demerits.
b) Explain anatomy of bifacial and isobilateral leave, with reference to their 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 ultra-structure of plant cell wall.
(10+10=20 Marks)
Q. No. 7:
a) Write detailed note on structure and function of sclerenchyma.
b) Differentiate between primary and secondary growth. Elaborate secondary growth in dicot stem with the help of suitable 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. Apomixies
iv. Polyembryony
(4×5=20 Marks)
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