Categorise the following plants into hydrophytes, halophytes, mesophytes and xerophytes. Give reasons for your answers.
(a) Salvinia (b) Opuntia
`(c)`Rhizophora (d) Mangifera

Explanation

To categorize the given plants into hydrophytes, halophytes, mesophytes, and xerophytes, we will analyze each plant based on its habitat and characteristics.

### Step-by-Step Solution:

1. **Identify Hydrophytes:**
- **Plant:** Salvinia
- **Category:** Hydrophyte
- **Reason:** Salvinia is a floating aquatic plant that is either partially or completely submerged in water. It thrives in wet environments, making it a classic example of a hydrophyte.
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