Arrange the following in the ascending order based on their chromosome number (i) Primary endosperm cell of Maize (ii) Meristematic cell of Apple (iii) Xylem parenchyma cell of Potato (iv) Aleurone layer cell of Rice.

Options

A. iv, I, ii,iii
B. iii,iv,I,ii
C. I,ii,iv,iii
D. ii,iii,I,iv

Answer

To arrange the given cells in ascending order based on their chromosome number, we need to identify the chromosome count for each cell type mentioned in the question. Here’s how we can do that step by step:

### Step 1: Identify the chromosome number of each cell type
1. **Primary endosperm cell of Maize**:
- The primary endosperm cell is triploid (3n).
- In maize, the haploid number (n) is 10, so the chromosome number is 3n = 3 × 10 = **30**.

2. **Meristematic cell of Apple**:
- Meristematic cells are typically diploid (2n).
- In apple, the diploid number is **34**.

3. **Xylem parenchyma cell of Potato**:
- Xylem parenchyma cells are also diploid (2n).
- In potato, the diploid number is **48**.

4. **Aleurone layer cell of Rice**:
- The aleurone layer cell is triploid (3n).
- In rice, the haploid number (n) is 12, so the chromosome number is 3n = 3 × 12 = **36**.

### Step 2: List the chromosome numbers
Now we have the following chromosome counts:
- Primary endosperm cell of Maize: 30
- Meristematic cell of Apple: 34
- Aleurone layer cell of Rice: 36
- Xylem parenchyma cell of Potato: 48

### Step 3: Arrange in ascending order
Now, we can arrange these numbers in ascending order:
1. Primary endosperm cell of Maize: **30**
2. Meristematic cell of Apple: **34**
3. Aleurone layer cell of Rice: **36**
4. Xylem parenchyma cell of Potato: **48**

### Final Arrangement
Thus, the ascending order based on their chromosome number is:
1. Primary endosperm cell of Maize (30)
2. Meristematic cell of Apple (34)
3. Aleurone layer cell of Rice (36)
4. Xylem parenchyma cell of Potato (48)

### Answer
The final answer is:
**(i) Primary endosperm cell of Maize < (ii) Meristematic cell of Apple < (iv) Aleurone layer cell of Rice < (iii) Xylem parenchyma cell of Potato**