Question

In which group of algae are food materials stored in pyrenoids?

• A. Phaeophyceae
• B. Rhodophyceae
• C. Chlorophyceae
• D. Cyanobacteria

Hint:

Remember: Chlorophyceae = Green algae = Pyrenoids storing starch.

Answer 1

The Correct Option is C

In the study of algae, understanding how and where food materials are stored is crucial. Pyrenoids are specialized structures associated with the storage of food materials in certain groups of algae. These are typically found in the group Chlorophyceae.

Let's delve into why Chlorophyceae is associated with pyrenoids:

• Chlorophyceae: This group, commonly referred to as green algae, includes organisms that contain chlorophylls a and b, which are essential for photosynthesis, similar to higher plants. In Chlorophyceae, starch is the primary food reserve, and it is stored in the chloroplasts where pyrenoids are found. Pyrenoids facilitate the conversion and storage of these starches effectively.
• Phaeophyceae: Also known as brown algae, this group stores food mainly as laminarin and mannitol, and pyrenoids are not significant in this group.
• Rhodophyceae: This group is called red algae, and the storage product is typically floridean starch, stored in the cytoplasm rather than being related to pyrenoids.
• Cyanobacteria: These are not true algae, despite often being grouped similarly due to historical reasons; they store glycogen instead, without the use of pyrenoids.

In conclusion, within the major groups of algae, specifically Chlorophyceae (green algae), pyrenoids play a crucial role in the storage of starch, highlighting their unique biological function in this group.