Diatoms

Definition

Diatoms are a major group of algae, specifically microalgae, characterized by their unique silica cell walls. They are found in oceans, freshwater, soils, and damp surfaces.

5 Must Know Facts For Your Next Test

1. Diatoms have intricate cell walls made of silica called frustules.
2. They play a crucial role in aquatic ecosystems by producing oxygen through photosynthesis.
3. Diatoms are used in various industrial applications, such as filtration and as abrasives.
4. Their fossilized remains form diatomaceous earth, which has multiple commercial uses.
5. Diatoms reproduce both sexually and asexually, with sexual reproduction typically triggered by environmental stress.

Review Questions

• What material comprises the cell walls of diatoms?
• How do diatoms contribute to the oxygen levels in aquatic environments?
• What is one commercial use of fossilized diatoms?

Related terms

Algae: A diverse group of photosynthetic organisms found in various aquatic environments.

Silica: A hard, unreactive compound that makes up the cell walls of diatoms.

Phytoplankton: Microscopic organisms that live in watery environments and perform photosynthesis.