The haploid chromosome number in sugarcane is how many times greater than diploid number of maize?

Options

A. One
B. Three
C. Two
D. Six

Answer

To solve the question, "The haploid chromosome number in sugarcane is how many times greater than the diploid number of maize?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Diploid Number of Maize**:
- The diploid chromosome number (2n) for maize is given as 20.

2. **Calculate the Haploid Number for Maize**:
- The haploid chromosome number (n) is half of the diploid number.
- Therefore, for maize:
\[ n = \frac{2n}{2} = \frac{20}{2} = 10 \]

3. **Identify the Diploid Number of Sugarcane**:
- The diploid chromosome number for sugarcane is given as 80.

4. **Calculate the Haploid Number for Sugarcane**:
- Similarly, the haploid chromosome number for sugarcane is:
\[ n = \frac{2n}{2} = \frac{80}{2} = 40 \]

5. **Compare the Haploid Number of Sugarcane with the Diploid Number of Maize**:
- Now, we need to find out how many times the haploid number of sugarcane (40) is greater than the diploid number of maize (20).
- We can calculate this by dividing the haploid number of sugarcane by the diploid number of maize:
\[ \text{Times greater} = \frac{40}{20} = 2 \]

6. **Conclusion**:
- Therefore, the haploid chromosome number in sugarcane is 2 times greater than the diploid number of maize.

### Final Answer:
The haploid chromosome number in sugarcane is **2 times** greater than the diploid number of maize.