Which cell organelle provides supporting skeletal framework to cell ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Cell Organelles**: Begin by recognizing that cells contain various organelles, each with specific functions. Some organelles provide structure and support, while others are involved in processes like energy production, protein synthesis, and storage.

2. **Identifying the Organelles**: Among the various organelles, we need to focus on those that contribute to the cell's skeletal framework. The cytoskeleton, which includes microtubules, microfilaments, and intermediate filaments, is crucial for providing structural support to the cell.

3. **Focusing on Endoplasmic Reticulum (ER)**: The endoplasmic reticulum (ER) is a significant organelle in the cell. It exists in two forms: rough ER (with ribosomes) and smooth ER (without ribosomes). The ER plays a vital role in the synthesis of proteins and lipids and also provides mechanical support to the cell.

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