IAS Zoology Examination-2003-Mains PAPER - II

PAPER - II - 2003

Time Allowed: Three Hours Maximum Marks: 300

Candidates should attempt Questions 1 and 5 which are compulsory and remaining any

THREE questions selecting at least ONE from each Section.

SECTION A

1. In about 200 words each, explain any three of the following:

(a) Double refraction and birefringence 20

(b) Textures in volcanic rocks: petrogenetic significance 20

(c) Retrograde metamorphism: the assemblage minerals, textures and their

significance 20

(d) Ripples, Dunes and cross-breeding: origin and significance 20

2. Describe the chemical composition, physical properties and mode of occurrence

of Phosphate group of minerals. 60

3. Write explanatory notes on the following:

(a) Carbonatities; their mode of occurrence, petrography and petrogenesis. 30

(b) Granulite terrains of India: their mineral assemblages and petrogenetic

characteristics. 30

4. Define provenance and its importance in Sedimentology. Describe the provenance

indicators to identify different source rocks. 60

SECTION B

5. In about 200 words each, write notes on any three of the following:

(a) Stratabound and stratiform deposits: characteristics and examples. 20

(b) Heavy media separation as ore-dressing process 20

(c) Isomorphism and isomorphous mixture, examples. 20

(d) Fertilizers/and their impact on groundwater pollution

6. Write notes on the following, in brief:

(a) Pyrometasomatic deposits: their genesis and general characteristics. 30

(b) Placer deposits of thorium in India: their geological setting and mode of

occurrence 30

7. Describe the methods of geological prospecting giving their applications and

limitations. Add a note on geobotanical prospecting methods. 60

8. Write notes on the following, in brief:

(a) Goldschmidt's geochemical classification of the elements with examples.

30

(b) Legislative measures for environmental protection in India. 30