What are two types of auxin?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Auxins**: Auxins are a class of phytohormones or plant growth regulators (PGRs) that play a crucial role in plant growth and development. They are known for promoting cell elongation, particularly in the shoots of plants.

2. **Types of Auxins**: Auxins can be categorized into two main types:
- **Natural Auxins**: These are auxins that occur naturally in plants. The most well-known natural auxin is Indole-3-acetic acid (IAA). Another example of a natural auxin is Indole-3-butyric acid (IBA).
- **Synthetic Auxins**: These are artificially created auxins that mimic the action of natural auxins. Examples include Naphthalene acetic acid (NAA) and 2,4-Dichlorophenoxyacetic acid (2,4-D).

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