Organisms , known as Jokers of the plant kingdom, are characterised by :

Options

A. presence of mesosomes and absence of flagella
B. presence of flagella and absence of cell wall
C. absence of cell wall and presence of mesosomes
D. absence of flagella and cell wall

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to organisms known as the "jokers of the plant kingdom." This term is commonly associated with Mycoplasma.

2. **Understand the Characteristics**: Mycoplasma is characterized by:
- The absence of a cell wall.
- The presence of mesosomes (which are infoldings of the plasma membrane).
- The absence of flagella.

3. **Explain the Significance**: Mycoplasma can change its size and shape based on environmental conditions due to the lack of a rigid cell wall. This adaptability is one of the reasons it is referred to as the "joker" of the plant kingdom.

4. **Summarize the Key Features**:
- **Absence of Cell Wall**: This allows for flexibility in shape.
- **Presence of Mesosomes**: These structures are involved in various cellular processes.
- **Absence of Flagella**: Mycoplasma does not have flagella, which are typically used for movement.

5. **Select the Correct Option**: Based on the characteristics discussed, the correct answer to the question is:
- Absence of cell wall and absence of flagella.

### Final Answer:
The organisms known as the jokers of the plant kingdom are characterized by the absence of cell wall and absence of flagella.

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