An all information categorized and included graphical tabulated short note of all the biomes in the world and ecosystems in Sri Lanka appearing in the environmental biology unit of the G.C.E. Advanced Level 2019.

Year wise classification of all definitions appearing in G.C.E. Advanced Level Biology past papers from year 2000 – 2019 (20 years).

Definitions of all terms appearing in the G.C.E. Advanced Level Biology 2019 Syllabus from unit 1 to 10.

Alphabetical classification of all definitions appearing in the book.

A brief description on memorizing methods.

All definitions of terms have been written with reference to the resource books as the examinations will mostly be tested in regards to the content appearing in the resource book.