Odd One Out: Mustard

Explanation:
The odd one out among the given plants is Mustard. Let's analyze each plant to understand why it is the odd one out.

1. Neem:
- Neem is a type of tree that belongs to the mahogany family.
- It is native to the Indian subcontinent and can also be found in other tropical and subtropical regions.
- Neem is known for its medicinal properties and is used in various traditional remedies.
- It is a valuable source of timber, oil, and fodder.

2. Mango:
- Mango is a fruit-bearing tree that belongs to the Anacardiaceae family.
- It is native to South Asia and is widely cultivated in tropical and subtropical regions.
- Mango is known for its sweet and juicy fruit, which is consumed fresh or used in various culinary preparations.
- There are many different varieties of mango, each with its own unique taste and characteristics.

3. Mustard:
- Mustard is a plant that belongs to the Brassicaceae family.
- It is grown for its seeds, which are used to produce mustard oil and various condiments.
- Mustard plants are annual herbs that can reach a height of 1 to 3 meters.
- They have yellow flowers and produce small, round seeds that are typically brown or black.

4. Coconut:
- Coconut is a large, palm-like tree that belongs to the Arecaceae family.
- It is native to tropical regions and is widely cultivated for its fruit, known as the coconut.
- Coconuts are known for their versatility and are used in various ways, such as food, oil, fiber, and building materials.
- Coconut trees can grow up to 30 meters in height and have large, feather-like leaves.

Conclusion:
Among the given plants, Mustard is the odd one out because it is the only plant that is primarily grown for its seeds, while the other plants (Neem, Mango, and Coconut) are known for their fruits and other valuable parts.