The cuticle is the waxy, waterproof layer that covers the epidermis of plants, helping to reduce water loss. In this question, we are asked to identify where the cuticle is absent. The correct answer is option 3, root.

Explanation:

1. Leaf: Leaves have a well-developed cuticle on their surface to prevent excessive water loss through evaporation. So, the cuticle is present in leaves.

2. Stem: Similar to leaves, stem also has a cuticle to minimize water loss. Therefore, the cuticle is present in stems as well.

3. Root: The root is primarily responsible for absorbing water and nutrients from the soil. It does not have a cuticle since it needs to allow water uptake from the surrounding soil.

4. Fruit: Fruits are derived from flowers and possess various structures, including a protective layer called the cuticle. So, the cuticle is present in fruits.

In summary, the cuticle is absent in roots, making option 3 the correct answer.