Read the following matches regarding the placentation :
(i) Dianthus - Free central
(ii) Cannabis - Marginal
(iii) Sunflower - Basal
(iv) Cucurbita - Axile
Which of these are correct ?

Options

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

Answer

To determine which of the matches regarding placentation are correct, we need to analyze each option provided in the question:

1. **Dianthus - Free central**:
- In free central placentation, the ovules are attached to a central column and are not separated by septa. This type of placentation is indeed found in Dianthus. Therefore, this match is **correct**.

2. **Cannabis - Marginal**:
- Marginal placentation occurs when ovules are attached along the margin of the ovary. However, Cannabis actually exhibits apical placentation, not marginal. Thus, this match is **incorrect**.

3. **Sunflower - Basal**:
- In basal placentation, the ovule is attached at the base of the ovary. This is indeed the case for Sunflower. Therefore, this match is **correct**.

4. **Cucurbita - Axile**:
- Axile placentation occurs when the ovary is divided into two or more locules, with ovules attached to the central axis. Cucurbita (like squash) actually has a parietal placentation, not axile. Thus, this match is **incorrect**.

Now, summarizing the correctness of the matches:
- **Dianthus - Free central**: Correct
- **Cannabis - Marginal**: Incorrect
- **Sunflower - Basal**: Correct
- **Cucurbita - Axile**: Incorrect

The correct matches are the first and third ones. Therefore, the answer to the question is:

**Correct Options**: 1st and 3rd.