Describe the process of primary succession on bare rocks.

Explanation

In primary succession on rocks, lichens are the pioneer species. Lichens secrete acids
to dissolve rock helping the weathering and soil formation.
These later pave way to some very small plants like bryophytes, which are able to take hold in the small amount of soil.
They are with time succeeded by bigger plants and after several more stages, ultimately a stable climax forest community is formed.
The climax community remains stable as long as the environment remains unchanged.