Single maize root apical meristem can give rise to more than (A)___ new cells per hour whereas cells in a watermelon may increase in size o by upto (B)____ times.

Answer

To solve the question regarding the growth rates of maize root apical meristem and watermelon cells, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for two specific values: (A) the number of new cells produced by a single maize root apical meristem per hour, and (B) the factor by which cells in a watermelon can increase in size.

2. **Finding Value for (A)**:
- The maize root apical meristem is known for its high growth rate.
- According to biological studies, a single maize root apical meristem can produce more than **17,500 new cells per hour**.
- Therefore, we can fill in (A) with **17,500**.

3. **Finding Value for (B)**:
- Watermelon cells are also known for their significant growth potential.
- It has been observed that cells in a watermelon can increase in size by up to **350,000 times**.
- Thus, we can fill in (B) with **350,000**.

4. **Final Answer**:
- Therefore, the completed statement would be:
- Single maize root apical meristem can give rise to more than **17,500** new cells per hour whereas cells in a watermelon may increase in size by up to **350,000** times.