Botany Balochistan PCS Paper 2021

BALOCHISTAN PUBLIC SERVICE COMMISSION

COMPETITIVE EXAMINATION 2021

FOR RECRUITMENT TO THE POSTS OF

ASSISTANT COMMISSIONER/SECTION OFFICER (B-17)

IN THE SERVICES & GENERAL ADMINISTRATION DEPARTMENT

BOTANY

July 09, 2021

Total Marks 150

Time Allowed 03 Hours

NOTE

i Attempt five questions in all, selecting two from each section, apart from question No 1 which is COMPULSORY All questions carry equal marks Draw diagrams where necessary

ii All the parts (if any) of each Question must be attempted at one place instead of at different places

iii Candidate must write Q No in the Answer Book in accordance with Q No in the Q Paper

iv No Page/Space be left blank between the answers All the blank pages of Answer Book must be crossed

v Extra attempt of any question or any part of the attempted question will not be considered

Q 1 a SELECT ONE BEST OPTION (10)

i Plasmids play an important role in

1. a) Conjugation b) Division c) Regulation d) Protection

ii The filament with prostrate and vertical systems are

1. a) Monotrichous b) Heterotrichous c) Coenocytes d) Coenobia

iii Enzyme Zymase is produced by

1. a) Yeast b) Pythium c) Penicillium d) Plasmodiophora

iv Match ligule with one of the following

1. a) Root b) Leaf c) Stem d) Rhizome

v The nonpolar organic molecules that are insoluble in polar water but soluble in nonpolar organic are

1. a) Protein b) Carbohydrate c) Lipids d) DNA

vi Net number of ATP produced during Glycolysis

1. a) 2 b) 9 c) 4 d) 6

vii Which of the following is secondary pollutant?

1. a) Co b) SO2 c) PAN d) HF

viii Soil transported by water is called

1. a) Residual b) Colluvial c) Aeolian d) Alluvial

ix Number of ATP formed by oxidation of one molecule of glucose are

1. a) 34 b) 43 c) 24 d) 36

x The hormone which promotes apical dominance is

1. a) Auxin b) Gibberellin c) Ethine d) Cytokinin

b FILL IN THE BLANKS (10)

i The elongated, horizontal, thick and fleshy underground stem is called ______

ii Genera are composed of one or more similar ______

iii Nucleic acid is polymer of ______

iv The division of the whole cell is called ______

v The cross in which two traits is followed at a time is called ______ cross

vi The number of moles of a solute per ______ of a solution is called molarity

vii The plants which survive two growing seasons are called ______ plants

viii The place where an organism lives is called its ______

ix All non-cultivated plants and non-domesticated animals are included in ______

x The plants which live for one year called ______

c DEFINE THE FOLLOWING TERMS (10)

i Tapetum v Asymbiotic organism ix Photoperiodism

ii Pili vi Ecological niche x Frustule

iii Sclerenchyma vii Humus

iv Polyploidy viii Succession

SECTION-I

Q No 2 a Discuss the diverse sense organs and appendages in sub phylum Crustacea and describe metamorphosis in insects (15)

b Sketch the classification of subphylum Crustacea with examples (15)

Q No 3 a Define triploblastic organization and describe the three types of triploblastic organization (15)

b Describe briefly the evolutionary perspective regarding origin of Cnidarians and also discuss its phylogenetic consideration with the help of cladogram (15)

Q No 4 a Draw the Molluscan body organization and describe the classification of Phylum Mollusca with examples (15)

b Enlist some important nematode parasites of humans Explain the life cycle of Fasciola hepatica with the help of diagram (15)

SECTION-II

Q No 5 a Classify the class Amphibia with important examples and distinguishing characteristics and discuss the evolution of axial skeleton and temperature regulation in Amphibians (15)

b Explain Circulation, osmoregulation and gaseous exchange in fishes (15)

Q No 6 a Discuss the diagnostic features of class reptilian and classify the class reptilian up to order levels with important examples (15)

b Discuss adaptations of flight in birds (15)

Q No 7 a Describe the general characteristics, evolutionary adaptations and examples of Phylum Chordata (15)

b Describe the diverse features of mammals and enlist the classification of mammals up to order level with examples (15)

SECTION-III

Q No 8 a Describe the types of Genetic mutations (15)

b Explain the patterns of sex determination in different groups of animals (15)

Q No 9 a Describe the structures, formations and diverse functions of lysosomes (15)

b Discuss the phenomenon of replication and transcription with the help of diagram (15)

Q No 10 Write short note on any two of the following (15+15)

i Nitrogen cycle

ii Greenhouse effect

iii Ecological succession

iv Linkage and crossing over

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