Go through the following statements :
(i) Lysosomes contain hydrolytic enzymes which are optimally active at the alka line pH.
(ii) A number of proteins synthesised by ribosomes on the endoplasmic reticulum are modified in the cisternae of the Golgi apparatus before they are released from its cis face.
(iii) Typically a mitochondrion has a diameter of 0.2-1.0 `mu`m and length of 1.0 - 4.1 `mu`m
(iv) Elaioplasts store oils and fats.
Find out the correct statements

Options

A. (ii) & (iv)
B. (iii) & (iv)
C. (ii), (iii) & (iv)
D. All are correct

Answer

To determine the correct statements among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i)**: "Lysosomes contain hydrolytic enzymes which are optimally active at the alkaline pH."
- **Analysis**: Lysosomes are membrane-bound organelles that contain hydrolytic enzymes. These enzymes are primarily active at an acidic pH (around pH 5) rather than alkaline pH. Therefore, this statement is **incorrect**.

2. **Statement (ii)**: "A number of proteins synthesized by ribosomes on the endoplasmic reticulum are modified in the cisternae of the Golgi apparatus before they are released from its cis face."
- **Analysis**: This statement is correct. The rough endoplasmic reticulum is involved in the synthesis of proteins, and these proteins are then transported to the Golgi apparatus where they undergo modification and packaging before being released from the cis face. Thus, this statement is **correct**.

3. **Statement (iii)**: "Typically a mitochondrion has a diameter of 0.2-1.0 µm and length of 1.0 - 4.1 µm."
- **Analysis**: The typical size of a mitochondrion is approximately 0.5 to 1.0 µm in diameter and can be about 7 µm in length. The values given in the statement do not accurately represent the typical dimensions of mitochondria. Therefore, this statement is **incorrect**.

4. **Statement (iv)**: "Elaioplasts store oils and fats."
- **Analysis**: Elaioplasts are indeed specialized plastids that store oils and fats. This statement is **correct**.

### Conclusion:
The correct statements are:
- Statement (ii): Correct
- Statement (iv): Correct

### Final Answer:
The correct statements are (ii) and (iv).

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