The term ecosystem was coined by :
1. E. Warming
2. E.P.Odum
3. A.G. Tansley
4. E. Haeckel

Niche is
1. all the biological factors in the organism's environment
2. the functional role played by the organism where it lives
3. the range of temperature that the organism needs to live
4. the physical space where an organism lives

Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in

1. Tropical Savannah
2. Tropical Rain Forest
3. Grassland
4. Temperate Forest