**The main function of roots is to absorb water and nutrients from the soil.**

**Explanation:**

Roots are an essential part of plants and perform several important functions. One of the main functions of roots is to absorb water and nutrients from the soil. This is crucial for the survival and growth of the plant.

**Absorbing Water:**
- The root system of a plant consists of numerous tiny root hairs that increase the surface area for water absorption.
- These root hairs are in close contact with the soil particles and can absorb water through a process called osmosis.
- The root hairs have a higher concentration of solutes inside them compared to the soil, causing water to move into the roots.

**Absorbing Nutrients:**
- In addition to water, roots also absorb essential nutrients from the soil.
- These nutrients include minerals such as nitrogen, phosphorus, and potassium, which are necessary for plant growth.
- The root hairs have specialized structures called root cap cells and mycorrhizae that help in the absorption of nutrients.

**Transporting Water and Nutrients:**
- Once absorbed, water and nutrients are transported through the roots to the rest of the plant.
- The roots contain conducting tissues called xylem and phloem, which help in the movement of water and nutrients.
- The xylem transports water and minerals from the roots to the leaves, while the phloem transports sugars and other organic substances from the leaves to the rest of the plant.

**Anchoring and Support:**
- Roots also play a vital role in anchoring the plant in the soil.
- They provide stability and support, preventing the plant from being easily uprooted by wind or other external forces.
- The root system extends underground, spreading out and forming a strong network that helps keep the plant upright.

**Conclusion:**
In conclusion, the main function of roots is to absorb water and nutrients from the soil. This ensures the plant's survival and growth by providing it with essential resources. Additionally, roots also play a crucial role in anchoring and supporting the plant.