What activity is best to correct the misconception that all plant cells have chloroplasts?

Observing root cells under a microscope is the most effective activity to correct the misconception that all plant cells have chloroplasts. This hands-on activity allows students to directly examine root cells, which do not contain chloroplasts, thus providing clear, observable evidence that challenges their initial assumption. By seeing the cells themselves, students can gain a deeper understanding of the various functions and structures of plant cells, such as the presence of chloroplasts primarily in the green parts of plants where photosynthesis occurs, while root cells serve different functions and typically lack these organelles.

This direct observation reinforces the lesson by linking the concept of cell structures to their specific functions within the plant, promoting a more nuanced understanding of plant biology. Additionally, this experiential learning can be more impactful than simply reviewing textbook material or discussing theoretical concepts, as it engages students actively in the learning process.