NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Lichens are called pioneer colonisers of bare rock. How can they help in formation of soil?
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Lichens release small quantity of acids which corrode the surface of rock creating minute pores and releasing minerals. With the passage of time these minerals deposit on rock to form a thin layer of soil.