Which part of the plant should be watered?

The correct answer is option 'A': Roots.

Explanation:

1. Introduction
Plants require water for their survival and growth. Water is essential for various physiological processes in plants, including photosynthesis, nutrient absorption, and transportation. However, not all parts of the plant need to be directly watered. The most critical part that requires water is the roots.

2. Roots - The Absorbing Organ
Roots are the primary absorbing organs of a plant. They are responsible for taking up water and nutrients from the soil. The root system consists of fine, hair-like structures called root hairs, which greatly increase the surface area for absorption. These root hairs absorb water and dissolved nutrients through a process called osmosis.

3. Water Absorption Process
When the soil around the roots is moist, the root hairs absorb water from the soil. This water then moves through the root system, reaching the stem and leaves. From there, water is transported to different parts of the plant through specialized tissues called xylem vessels.

4. Watering the Roots
To ensure that plants receive an adequate water supply, it is essential to water the roots directly. When water is applied to the soil around the roots, it allows the root hairs to absorb the water efficiently. Watering the leaves, flowers, or branches may not provide direct access to the root system, and the water may not reach the roots effectively.

5. Watering Techniques
There are various techniques to water the roots effectively. One common method is watering the soil around the base of the plant using a watering can or a hose with a gentle flow. This allows the water to penetrate the soil and reach the root zone. Another technique is drip irrigation, where water is delivered directly to the roots through a network of tubes or pipes.

Conclusion
In conclusion, the roots of a plant should be watered as they are responsible for absorbing water and nutrients from the soil. Watering the roots directly ensures that the plant receives an adequate water supply for its growth and survival.