If a diploid chromosomal number of plant "A" is doubled for once gives the haploid chromosomal number of plant B and haploid chromosome number of plant .C. is equalent to the diploid chromosomal number of plant “D”. Identify the correct sequence of plant names

Options

A. Oryza sativa, Nicotiana tobaccum, Zea mays, Saccharum officinarum
B. Pisum sativum, Zea mays, oryza sativa, Allium cepa
C. Saccharum officinarum, Gossypium hirsutum, Oryza sativa, Nicotiana tobaccum
D. Zea mays, Saccharum officinarum, Nicotiana tobaccum, Oryza sativa

Answer

To solve the question step by step, we need to analyze the information given about the chromosomal numbers of the plants involved.

### Step-by-Step Solution:

1. **Understanding the Chromosomal Numbers**:
- Let the diploid chromosomal number of plant A be represented as \( 2n \).
- When this number is doubled, it becomes \( 2 \times 2n = 4n \).
- According to the question, this doubled number \( 4n \) is equal to the haploid chromosomal number of plant B, which we can denote as \( n_B \).

2. **Setting Up the First Equation**:
- From the information, we can set up the equation:
\[ 4n = n_B \]
- This means that the haploid number of plant B is equal to four times the haploid number of plant A.

3. **Analyzing Plant C and Plant D**:
- The question states that the haploid chromosome number of plant C (denote it as \( n_C \)) is equivalent to the diploid chromosomal number of plant D (denote it as \( 2n_D \)).
- This gives us the second equation:
\[ n_C = 2n_D \]

4. **Finding the Relationships**:
- We need to find the relationships between the plants based on their chromosomal numbers.
- From the first equation, we can express \( n \) in terms of \( n_B \):
\[ n = \frac{n_B}{4} \]
- Substituting this into the second equation gives:
\[ n_C = 2n_D \]

5. **Checking Options**:
- We will check the options provided in the question to see which ones satisfy the equations we have derived.
- For each option, we will verify if the relationships hold true.

6. **Identifying the Correct Sequence**:
- After checking the options, we find that the only option that satisfies both equations is option number 4.

### Conclusion:
The correct sequence of plant names based on the given conditions is:
- Plant A: \( 2n \)
- Plant B: \( n_B = 4n \)
- Plant C: \( n_C = 2n_D \)
- Plant D: \( 2n_D \)

Thus, the answer is option number 4.