Vertical distribution of different species occupying different levels in a biotic community is known as:

By the definition of stratification, it is the distribution of a community in different levels by various socioeconomic means. The different growth form (trees, shrubs, under shrubs, herbs) determines the structure of a plant community. Stratification is based on mode of arrangement of various growth forms.

In the deep lake, zonation or stratification may be according to the need of light. There are three types of zones differentiated is a deep lake - 

• Littoral Zone
• Limnetic zone
• Profundal zone

The clear stratification (vertical arrangement) in various growths from plants according to the need for light is any dense forest.

Surface dwellers $\to$  Herbs $\to$  under shrubs $\to$ Shrubs $\to$ Trees