What do you call the disk-like membrane sacs arranged in stacks in chloroplast called?*1 pointthylakoidsvacuolesstromagranum

The disk-like membrane sacs arranged in stacks within chloroplasts are called thylakoids. Thylakoids are essential structures in the chloroplasts of plants and algae, where they play a critical role in the photosynthesis process.

Explanation:

1. Structure: Thylakoids have a flattened, disk-like shape and are interconnected, resembling stacks of coins. These stacks are known as granum (plural: grana).
2. Function: The primary role of thylakoids is to house the chlorophyll and other pigments necessary for capturing light energy, which is then used to convert carbon dioxide and water into glucose during photosynthesis.
3. Location: Thylakoids are suspended in a fluid called the stroma, which contains enzymes and substrates needed for the light-independent reactions of photosynthesis.

In summary, the key term from your options is thylakoids.