If you are provided with root-tips of onion in your class and are
asked to count the chromosmes, which of the following stages can
you most convenintly look into.

Options

A. Telophase
B. Anaphase
C. Prophase
D. Metaphase.

Answer

To determine the most convenient stage for counting chromosomes in the root tips of onions, we can analyze each phase of cell division.

### Step-by-Step Solution:

1. **Understand the Stages of Cell Division**:
- The stages of cell division include Interphase, Prophase, Metaphase, Anaphase, and Telophase. Each stage has distinct characteristics regarding the visibility and arrangement of chromosomes.

2. **Analyze Each Stage**:
- **Prophase**: In this stage, chromosomes begin to condense and become visible, but they appear thin and filamentous, forming a network-like structure. This makes them not clearly visible for counting.
- **Metaphase**: During metaphase, chromosomes are at their most condensed and are arranged along the equatorial plate (metaphase plate). They are tightly coiled, shortest, and most clearly visible, making this stage ideal for counting.
- **Anaphase**: In anaphase, the chromatids separate and begin moving towards opposite poles of the cell. While chromosomes can be counted, they are in motion, which complicates accurate counting.
- **Telophase**: In telophase, chromosomes begin to uncoil and lengthen, becoming less distinct and not clearly visible for counting.

3. **Conclusion**:
- The best stage to count and study the number and morphology of chromosomes is **Metaphase**. This is because the chromosomes are tightly coiled, clearly visible, and arranged in a way that allows for easy counting.

### Final Answer:
The most convenient stage to look into for counting chromosomes in onion root tips is **Metaphase**.

---