Bacillariophyta

Definition

Bacillariophyta, commonly known as diatoms, are a major group of algae characterized by their unique silica cell walls. They are found in both marine and freshwater environments and play a crucial role in aquatic ecosystems.

5 Must Know Facts For Your Next Test

1. Diatoms have intricate, glass-like cell walls made of silica called frustules.
2. They contribute significantly to global oxygen production through photosynthesis.
3. Diatoms are a major component of phytoplankton and serve as primary producers in aquatic food webs.
4. Their fossilized remains form diatomaceous earth, which has various industrial applications.
5. Reproduction in diatoms primarily occurs through binary fission, but they can also reproduce sexually.

Review Questions

• What is the primary material composing the cell walls of Bacillariophyta?
• How do diatoms contribute to the oxygen levels on Earth?
• In what types of environments are Bacillariophyta commonly found?

Related terms

Algae:

Photosynthetic organisms that live in water and range from single-celled forms to large multicellular structures.

Phytoplankton:

Microscopic organisms that live in watery environments and perform photosynthesis.

Frustule: The hard and porous cell wall or external layer of diatoms made of silica.