Spindle fibers which extend from pole to kinetochores are :–

Options

A. Chromosomal or tractile fibers
B. Interzonal fibers
C. Supporting fibers
D. Astral rays

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking about the type of spindle fibers that extend from the poles of the spindle apparatus to the kinetochores of chromosomes during cell division.

2. **Identifying the Options**: The options provided are:
- Option 1: Chromosomal and Tractile Fibers
- Option 2: Interzonal Fibers
- Option 3: Supporting Fibers
- Option 4: Astral Rays

3. **Analyzing Option 1 (Chromosomal and Tractile Fibers)**:
- During metaphase, the spindle fibers, specifically the tractile fibers, extend from the poles of the spindle apparatus to the kinetochores of the chromosomes.
- The kinetochores are protein structures on the chromosome where the spindle fibers attach, allowing for the movement of chromosomes during cell division.

4. **Analyzing Option 2 (Interzonal Fibers)**:
- Interzonal fibers are formed during anaphase and are located between the two sets of chromatids. They do not extend from the poles to the kinetochores.

5. **Analyzing Option 3 (Supporting Fibers)**:
- Supporting fibers are not a recognized type of spindle fiber that connects from the poles to the kinetochores. This option is incorrect.

6. **Analyzing Option 4 (Astral Rays)**:
- Astral rays are microtubules that radiate from the centrioles but do not connect directly to the kinetochores. They help in positioning the spindle apparatus but are not the fibers that attach to the kinetochores.

7. **Conclusion**: Based on the analysis, the correct answer is **Option 1: Chromosomal and Tractile Fibers**, as these are the spindle fibers that extend from the poles to the kinetochores during cell division.