Question

Ferns are simultaneously involved in promoting rock weathering, while preventing soil erosion. Explain how a single plant can perform both these functions, and how these functions are beneficial to its ecosystem.

Short answer

• A fern roots work through the top layer of earth, they might encounter rocks and slowly grow through them.
• This will break the rock down into small pieces (weathering).
• However, the roots hold the earth, preventing soil erosion.

Step-by-step solution

Step 1. Introduction

A fern roots into the soil through its rhizome system.

Step 2. Explanation

• The working of roots through the top layer of earth helps in encountering rocks and ultimately moves slowly through them.
• This leads to weathering, contributing rock cycle to the prevention of soil erosion.
• Many other living plants and animals will benefit from the added habitat (e.g. dunes on a shoreline).