Adventitious roots absorb moisture from atmosphere in

Options

A. Cuscuta
B. Avicennia
C. Vanda
D. Striga

Answer

**Step-by-Step Solution:**

1. **Understanding Adventitious Roots**: Adventitious roots are roots that arise from an unusual place, such as from stems or leaves, rather than from the primary root. They can serve various functions, including absorption of moisture.

2. **Identifying Types of Adventitious Roots**: Some adventitious roots are specialized for absorbing moisture from the atmosphere. These roots often have a unique structure that allows them to perform this function effectively.

3. **Recognizing the Velamen**: The roots that absorb moisture from the atmosphere are often covered with a layer of dead spongy tissue known as the "velamen." This velamen helps in the absorption of moisture from the air, dew, and rain.

4. **Classifying Epiphytic Roots**: Roots that are adapted to absorb moisture from the atmosphere are referred to as epiphytic roots. These roots are commonly found in certain plant species that grow on other plants but do not harm them.

5. **Evaluating the Options**: The question provides several options:
- **Cascuta**: A parasitic plant that does not have epiphytic roots.
- **Avicennia**: A mangrove plant that has specialized roots for salt tolerance, not primarily for atmospheric moisture absorption.
- **Vanda**: An epiphytic orchid known for its adventitious roots that can absorb moisture from the atmosphere.
- **Striga**: A parasitic plant that does not have the capacity to absorb moisture from the atmosphere like epiphytic plants.

6. **Conclusion**: Based on the characteristics of the roots and the definitions provided, the correct answer is **Vanda**, as it possesses adventitious roots that absorb moisture from the atmosphere.

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