In which of the following cases, conversion of leucoplasts to chloroplasts is observed?
(i) Tubers of radish
(ii) Potato tubers
(iii) Ovary of tomato
(iv) Maize kernels

Options

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

Answer

To determine in which cases the conversion of leucoplasts to chloroplasts is observed, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Leucoplasts and Chloroplasts**:
- Leucoplasts are non-pigmented plastids primarily involved in the storage of starch, oils, and proteins.
- Chloroplasts are green plastids that contain chlorophyll and are responsible for photosynthesis.

2. **Analyzing Each Option**:
- **(i) Tubers of Radish**:
- Radish tubers are storage organs that initially contain leucoplasts. When they start to develop green parts or are exposed to light, these leucoplasts can convert to chloroplasts, enabling photosynthesis.
- **Conclusion**: Yes, conversion occurs.

- **(ii) Potato Tubers**:
- Similar to radish, potato tubers are also storage organs that contain leucoplasts. Under certain conditions, such as exposure to light, these leucoplasts can convert to chloroplasts.
- **Conclusion**: Yes, conversion occurs.

- **(iii) Ovary of Tomato**:
- The ovary of a tomato is not a storage organ; it primarily functions in reproduction. Therefore, it does not involve the conversion of leucoplasts to chloroplasts.
- **Conclusion**: No conversion occurs.

- **(iv) Maize Kernels**:
- Maize kernels are primarily storage tissues that contain leucoplasts. However, they do not typically convert to chloroplasts as they are not exposed to light in the same way as tubers.
- **Conclusion**: No conversion occurs.

3. **Final Answer**:
- The cases in which conversion of leucoplasts to chloroplasts is observed are:
- (i) Tubers of Radish
- (ii) Potato Tubers

### Summary:
The correct options are (i) Tubers of Radish and (ii) Potato Tubers.

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