What do the chloroplasts of algae lack?

Chloroplasts are organelles found in the cells of plants and some algae that are responsible for photosynthesis. While the chloroplasts of most algae are similar to those found in plants, there are some differences between them. One of the differences is that the chloroplasts of some algae lack grana, which are stacks of thylakoid membranes within the chloroplast that contain the photosynthetic pigments. Instead, these algae have a simpler structure of thylakoid membranes called lamellae. Therefore, the correct answer to the question is grana.