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Questions and Answers
What is the primary environment in which diatoms are found?
What is the primary environment in which diatoms are found?
- Both fresh water and marine environments (correct)
- Only in marine environments
- In terrestrial habitats exclusively
- Only in fresh water
What is a significant characteristic of the cell walls of diatoms?
What is a significant characteristic of the cell walls of diatoms?
- They are thin and easily damaged
- They are indestructible and embedded with silica (correct)
- They are made of carbon
- They consist mainly of protein
What is diatomaceous earth primarily composed of?
What is diatomaceous earth primarily composed of?
- Organic matter remnants
- Cell wall deposits from diatoms (correct)
- Coal and mineral deposits
- Sediment from marine creatures
What ecological role do diatoms play in the ocean?
What ecological role do diatoms play in the ocean?
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For what purposes is diatomaceous earth commonly used?
For what purposes is diatomaceous earth commonly used?
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Study Notes
Diatoms and Golden Algae
- Include both diatoms and golden algae (desmids).
- Found in both freshwater and marine environments.
- Microscopic organisms that float passively in water currents, classified as plankton.
- Majority are photosynthetic, contributing to the ecosystem.
Structure and Composition
- Diatoms possess unique cell walls composed of two thin, overlapping shells, resembling a soap box.
- Shells are embedded with silica, making them indestructible.
- Accumulation of diatom cell wall deposits over billions of years creates 'diatomaceous earth.'
Uses of Diatomaceous Earth
- Diatomaceous earth has a gritty texture, making it useful in various applications.
- Commonly used for polishing and as a filtration medium for oils and syrups.
Ecological Role
- Diatoms are the primary producers in ocean ecosystems, forming the foundation of the food web.
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Description
Explore the fascinating world of diatoms and golden algae, crucial components of aquatic ecosystems. This quiz covers their structure, ecological roles, and practical applications, including the use of diatomaceous earth. Test your knowledge on these microscopic organisms and their importance in the environment.
