What type of perennating structures are produced by lower plants to overcome adverse environmental conditions ?

Explanation

### Step-by-Step Solution:

1. **Understanding Adverse Environmental Conditions**:
- Lower plants, such as algae, face adverse environmental conditions like drought, waterlogging, high temperatures, and high light intensities. These conditions hinder their growth.

2. **Definition of Perennating Structures**:
- Perennating structures are specialized structures that allow plants to survive unfavorable conditions. They help in enduring periods of stress until conditions improve.

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