Which one of the following pairs of plant structures has diploid number of chromosomes

Options

A. Nucellus and antipodal cells
B. Antipodal cells and egg cell
C. Antipodal cells and megaspore mother cell
D. None of the above

Answer

To solve the question "Which one of the following pairs of plant structures has diploid number of chromosomes?", we will follow these steps:

### Step 1: Understand the Ploidy Levels
First, we need to understand the concept of ploidy levels in plant structures. In plants, the diploid (2n) phase is the sporophyte generation, while the haploid (n) phase is the gametophyte generation.

### Step 2: Identify Plant Structures
We will identify the relevant plant structures that are commonly discussed in the context of their ploidy:
- Nucellus
- Megaspore Mother Cell
- Embryo Sac
- Antipodal Cells
- Synergids
- Egg Cell

### Step 3: Analyze Each Structure
- **Nucellus**: This is part of the ovule and is diploid (2n).
- **Megaspore Mother Cell**: This cell is also diploid (2n) and undergoes meiosis to form haploid megaspores.
- **Embryo Sac**: This structure is haploid (n) as it develops from the megaspores.
- **Antipodal Cells**: These are haploid (n).
- **Synergids**: These are also haploid (n).
- **Egg Cell**: This is haploid (n).

### Step 4: Determine the Correct Pair
From our analysis:
- The **Nucellus** and **Megaspore Mother Cell** are both diploid (2n).
- Other structures like the **Embryo Sac**, **Antipodal Cells**, **Synergids**, and **Egg Cell** are all haploid (n).

### Step 5: Conclusion
Since we are looking for a pair of structures that are both diploid, the correct answer would be the pair consisting of the Nucellus and the Megaspore Mother Cell. However, if the question provides options and none of them contain this pair, then we would conclude that none of the options are correct.

### Final Answer
Thus, based on the analysis, the answer to the question is that the pair of structures with a diploid number of chromosomes is the **Nucellus** and **Megaspore Mother Cell**.