Identify the correct pair of statements
I. Movement of cytoplasm around vacuoles occurs in clockwise and anticlockwise manners in Hydrilla
II. Heteropicnosis refers to differential stainability of chromatin
III, Dissolution of synaptonemal complex occurs in diplotene
IV. Either clockwise or anticlockwise movement of cytoplasm around vacuoles occurs in Rheo discolor

Options

A. I and III
B. II and III
C. II and IV
D. I and IV

Answer

To solve the question, we need to evaluate each of the four statements provided and determine if they are correct.

### Step-by-Step Solution:

1. **Evaluate Statement I**:
- **Statement**: Movement of cytoplasm around vacuoles occurs in clockwise and anticlockwise manners in Hydrilla.
- **Analysis**: This refers to a phenomenon known as cytoplasmic streaming or cyclosis, which is observed in Hydrilla. This movement can indeed occur in both directions.
- **Conclusion**: **Correct**

2. **Evaluate Statement II**:
- **Statement**: Heteropyknosis refers to differential stainability of chromatin.
- **Analysis**: Chromatin can be classified into euchromatin (lightly stained) and heterochromatin (densely stained). The term heteropyknosis describes the differential staining properties of these chromatin types.
- **Conclusion**: **Correct**

3. **Evaluate Statement III**:
- **Statement**: Dissolution of synaptonemal complex occurs in diplotene.
- **Analysis**: The diplotene stage of meiosis is characterized by the dissolution of the synaptonemal complex, which allows homologous chromosomes to begin separating.
- **Conclusion**: **Correct**

4. **Evaluate Statement IV**:
- **Statement**: Either clockwise or anticlockwise movement of cytoplasm around vacuoles occurs in Rheo discolor.
- **Analysis**: Similar to Hydrilla, Rheo discolor also exhibits cytoplasmic streaming, which can occur in either direction around vacuoles.
- **Conclusion**: **Correct**

### Final Conclusion:
All four statements are correct. However, since the question asks for a pair of correct statements and does not provide options that include all four, we conclude that each statement is valid on its own.