Which of the following statements is/are correct?
(i) The nucleus and the cytoplasm together make up the protoplasm. (ii) Chloroplasts are a type of plastids, which occur in plant cells. (iii) In many multicellular organisms, all cells have projections called cilia and flagella. (iv) Cell destruction occurs by centrosome.

Options

A. (i) and (ii) only
B. (i), (ii) and (iii) only
C. (i) only
D. (iii) and (iv) only

Explanation

To determine which statements are correct, let's analyze each one step by step:

1. **Statement (i)**: "The nucleus and the cytoplasm together make up the protoplasm."
- **Analysis**: Protoplasm refers to the living substance within a cell, which includes both the nucleus and the cytoplasm. Therefore, this statement is correct.

2. **Statement (ii)**: "Chloroplasts are a type of plastids, which occur in plant cells."
- **Analysis**: Chloroplasts are indeed a type of plastid found in plant cells. They are responsible for photosynthesis, allowing plants to convert sunlight into energy. Hence, this statement is also correct.

3. **Statement (iii)**: "In many multicellular organisms, all cells have projections called cilia and flagella."
- **Analysis**: This statement is incorrect. Not all cells in multicellular organisms have cilia and flagella. These structures are typically found in specific cells that require movement, such as sperm cells (which have flagella) or cells lining certain organs (which may have cilia). Therefore, this statement is false.

4. **Statement (iv)**: "Cell destruction occurs by centrosome."
- **Analysis**: This statement is incorrect. The centrosome is involved in cell division and organization of the microtubules but is not responsible for cell destruction. The correct organelle responsible for breaking down waste and cellular debris is the lysosome. Thus, this statement is false.

**Conclusion**: The correct statements are (i) and (ii). Therefore, the answer is that statements 1 and 2 are correct.

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