Robert Brown is known for his discovery of

Options

A. Chloroplasts
B. Respirometer
C. Nucelus
D. Mitochondria

Answer

**Step-by-Step Solution:**

1. **Identify the Scientist and Year**: Robert Brown is the scientist in question, and he made his discovery in the year 1831.

2. **Understand the Context of the Discovery**: Robert Brown was studying plant cells, specifically those of orchids, under a microscope.

3. **Determine What He Discovered**: During his observations, Robert Brown discovered a membrane-bound organelle that is present in eukaryotic cells. This organelle is crucial for various cellular functions.

4. **Name the Organelle**: The organelle that Robert Brown discovered is the nucleus. The nucleus is a double membrane-bound structure that contains the genetic material of the cell.

5. **Explain the Function of the Nucleus**: The nucleus is responsible for regulating gene expression and facilitating the replication of DNA, which are essential processes for cell function and reproduction.

6. **Eliminate Other Options**:
- Chloroplasts were discovered by Hugo Von Will.
- A respirometer is a device used to measure respiration rates, not an organelle.
- Mitochondria were discovered by Albert Von Kolyga.

7. **Conclude with the Correct Answer**: Based on the information, the correct answer to the question is option C: Nucleus.

**Final Answer**: C. Nucleus

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