The term pneumathode is used for

Options

A. Old root with lenticels
B. Pneumatophore
C. Lenticel on pneumatophore
D. Both B and C.

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Pneumatothode":**
- The term "pneumatothode" refers to a band or pore of aerating tissue. This type of tissue is primarily associated with certain plants, especially ferns, and is involved in the process of gas exchange.

2. **Analyzing the Options:**
- The question provides several options to choose from regarding the meaning of "pneumatothode."

3. **Option A: Old Root with Lenticel:**
- Lenticels are porous tissues found in the bark of woody stems and roots. They facilitate respiration but are not directly related to the term "pneumatothode." Therefore, this option is incorrect.

4. **Option B: Pneumatophore:**
- Pneumatophores are specialized aerial roots that are adapted for gaseous exchange. Since pneumatophores consist of aerating tissue, this option aligns with the definition of "pneumatothode." Thus, this option is correct.

5. **Option C: Lenticels on the Pneumatophores:**
- Pneumatophores can have lenticels on their surface, which are small openings that allow air to enter. This means that this option also relates to the concept of "pneumatothode," making it correct as well.

6. **Conclusion:**
- Both options B (Pneumatophore) and C (Lenticels on the Pneumatophores) are correct interpretations of the term "pneumatothode." Therefore, the final answer is that the term "pneumatothode" is used for both B and C.

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