Name an alga which has spiral chloroplast.

Explanation

To answer the question "Name an alga which has spiral chloroplast," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Algae**: Algae belong to the kingdom Plantae and are classified under the division Thallophyta. They have a simple body structure without true roots, stems, or leaves.

2. **Identify the Types of Algae**: Within the division Thallophyta, there are three main groups of algae:
- Red algae (Rhodophyta)
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