Answer:
Explanation: When a plant cell is placed in an isotonic solution, the concentration of solutes inside and outside the cell is equal. In this scenario, the osmotic pressure remains balanced and no water moves in or out of the cell. As a result, the chloroplasts, which are responsible for photosynthesis, remain unchanged in an isotonic solution.
In conclusion, in an isotonic solution, there is no net movement of water into or out of the cell, so the size and structure of the chloroplasts remain unaltered.