Which pair of protists has support structures composed of silica?
a. Dinoflagellates and diatoms
b. Diatoms and radiolarians
c. Radiolarians and forams
d. Forams and amoebozoans

Verified step by step guidance

1. Understand the question: The problem is asking which pair of protists has support structures composed of silica. Silica is a mineral commonly found in the cell walls or skeletons of certain protists.
2. Recall the characteristics of diatoms: Diatoms are a type of protist that have cell walls made of silica, forming intricate and beautiful patterns. This is a key feature of diatoms.
3. Recall the characteristics of radiolarians: Radiolarians are another type of protist that have internal skeletons composed of silica. These skeletons are often elaborate and contribute to their structural support.
4. Eliminate incorrect options: Dinoflagellates do not have silica-based structures; they typically have cellulose plates. Forams have calcium carbonate shells, not silica. Amoebozoans lack silica-based support structures entirely.
5. Identify the correct pair: Based on the information above, the pair of protists with silica-based support structures is diatoms and radiolarians.

Key Concepts

Diatoms

Diatoms are a group of microalgae characterized by their unique silica cell walls, which form intricate and beautiful patterns. These cell walls, known as frustules, provide structural support and protection, allowing diatoms to thrive in various aquatic environments. Their silica composition is crucial for their identification and ecological role in primary production.

Radiolarians

Radiolarians are single-celled protists that possess intricate silica skeletons, which can take on various geometric shapes. These skeletons not only provide structural support but also contribute to the formation of siliceous ooze on the ocean floor when they die. Radiolarians play a significant role in marine ecosystems and biogeochemical cycles.

Silica as a Support Structure

Silica, a compound made of silicon and oxygen, is a key component in the support structures of certain protists, such as diatoms and radiolarians. This material provides rigidity and protection, allowing these organisms to maintain their shape and survive in diverse environments. The presence of silica in their structures is a defining characteristic that aids in their classification and ecological function.