Which is incorrect with reference to chloroplast?

Option (3) is incorrect about chloroplasts. They are spherical, ovoid or disc-shaped cell organelles. These are found in plants and algae. They are involved in photosynthesis due to the presence of chlorophyll in them. During photosynthesis, $\mathrm{O}_2$ is released. They are not associated with any type of respiration, i.e. aerobic and anaerobic and can be found in any type of cell.