Following are a few organisms Which among the above can grow on stones, and also help in formation of soild? Write the mode of their action from making soil.

Options

A. lichen
B. mosses
C. mago tree
D. cactus

Answer

A

Explanation

Out of the above given organisms lichens can grown on rocks. During growth, they release certain substances that cause the rock surface to powder down and form a thin layer of soil. Lichens grow on the rock surface, extract minerals from them. This creates small crevices at places where a thin layer of soil builds up. Mosses grow over these crevices and cause deepening of the crevices and result in wider and deeper when the roots of short lived herbs pass into them. With the passage of time, the roots of bigger plants, (e.g., peepal banyan tree) pass into the cracks. Cracks gradually widen and cause slow fragmentation and eventually pulverisation of rocks.