The correct answer is option 1: Chloroplast.
Chloroplasts are organelles found in plant cells and some algae cells that are involved in the process of photosynthesis. Photosynthesis is the process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen.
Option 2: Mitochondrion is not involved in photosynthesis. Mitochondria are responsible for cellular respiration, which is the process of converting glucose into energy.
Option 3: Endoplasmic reticulum is not directly involved in photosynthesis. It is responsible for protein synthesis and lipid metabolism.
Option 4: Golgi bodies are not directly involved in photosynthesis. They are responsible for modifying, sorting, and packaging proteins and lipids for transport to their destination within the cell or outside of the cell.
In summary, only option 1 - Chloroplast is involved in photosynthesis, making it the correct answer.