The jokers of the plant kingdom are

Options

A. Bacteria
B. Archaebacteria
C. PPLO
D. Viriods

Answer

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

1. **Understanding the Question**: The question asks us to identify the "jokers of the plant kingdom." This term is often used to describe organisms that have unique characteristics that set them apart from typical members of the plant kingdom.

2. **Identifying Mycoplasma**: Mycoplasma is a type of bacteria that is known for lacking a cell wall. This absence of a cell wall allows Mycoplasma to change its shape, which is a significant deviation from the typical structure seen in most bacteria.

3. **Resistance to Antibiotics**: One of the key features of Mycoplasma is that it is not affected by antibiotics. Antibiotics typically work by targeting the cell wall of bacteria. Since Mycoplasma does not have a cell wall, antibiotics are ineffective against it.

4. **Reason for the Term "Jokers"**: The term "jokers" is used to describe Mycoplasma due to its unusual characteristics, such as shape-shifting and resistance to antibiotics, which make it stand out among other organisms in the plant kingdom.

5. **Evaluating Other Options**:
- **Bacteria**: These typically have a cell wall made of peptidoglycan, so they do not fit the description of "jokers."
- **Archaeobacteria**: Similar to bacteria, they also have a cell wall (made of pseudopeptidoglycan) and are classified under bacteria.
- **Viroids**: These are infectious agents that affect plants but are not classified as part of the plant kingdom in the same way as Mycoplasma.

6. **Conclusion**: The correct answer to the question is "Mycoplasma," also referred to as PPLO (Pleuropneumonia-like organism), which is the reason it is considered the joker of the plant kingdom.

**Final Answer**: The jokers of the plant kingdom are Mycoplasma (PPLO).

---