I would like to tell you that Environment subject come under which section of general science in assistant post exam conducted by Oil and Natural Gas Corporation and here I will get syllabus for you.

Here is the syllabus
General Aptitude
Number Systems.
Decimals & Fractions.
Whole Numbers.
Fundamental Arithmetical Operations.
Mixtures & Allegations.
Profit & Loss.
Time and Distance.
Time & Work.
Data Interpretation.
Percentages.
Mixture & Alligator.
Discount.
Ratios and Proportions.
The rate of Interest.

General Awareness
Static GK.
General Science.
Current Affairs.

Topics For Static GK
Indian History.
Politics.
Geography.
Arts.
Culture.

Topics For General Science
Physics.
Chemistry.
Defence.
Agriculture.
Space.
Environment.
Biology.
Agriculture.

Topics For Current Affairs
Economy.
Banking.
Awards.
Sports.
International Affairs.
Current Events.