- A plant cell is a kind of cell
- A cell nucleus is a part of a cell
- Hence, a cell nucleus is a part of a plant cell

- A cell nucleus is a part of a plant cell
- Chloroplast is a part of a plant cell
- A cell wall is a part of a plant cell for supporting and protecting the cell membrane
- Therefore, a cell nucleus, chloroplast and a cell wall are part of a plant cell

So, a cell nucleus, chloroplast and a cell wall are part of a plant cell
Question: With a microscope, you see that an object has a cell wall, a chloroplast, and a nucleus. What is being observed?
Context: - Chloroplast is a part of a plant cell 
- A plant cell is a kind of cell 
- A cell nucleus is a part of a cell 
- A cell wall is a part of a plant cell for supporting and protecting the cell membrane