Question

How do lichens prepare bare rock to support the growth of plants?

A.
They add nutrients to the rock and have roots that hold the rock together.
B.
They release acids that help break down the rock to form soil.
C.
They use nitrogen from the air to make nutrients that plants can use.
D.
They replace smaller trees and shrubs that can't get enough sunlight.

Answer 1

B. They release acids that help break down the rock to form soil.

Lichens chemically and physically weather bare rock: their acids dissolve minerals, they fracture the surface, and their bodies trap dust and organic matter. Over time this creates a thin soil layer that allows mosses and plants to grow.