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Questions and Answers
What characteristic distinguishes diatoms from golden algae in terms of their structure?
What characteristic distinguishes diatoms from golden algae in terms of their structure?
- Golden algae are non-photosynthetic organisms.
- Diatoms have indestructible cell walls embedded with silica. (correct)
- Diatoms have a single, solid shell structure.
- Golden algae possess thick cell walls that provide buoyancy.
Which of the following statements about diatomaceous earth is accurate?
Which of the following statements about diatomaceous earth is accurate?
- It is primarily composed of organic material.
- It is found only in marine environments.
- It has valuable applications in filtration and polishing due to its gritty texture. (correct)
- It is formed solely from the remains of golden algae.
In which habitats can diatoms be found?
In which habitats can diatoms be found?
- Only in freshwater ecosystems.
- Both freshwater and marine environments. (correct)
- Exclusively in extreme saline environments.
- Only in terrestrial habitats.
What role do diatoms play in oceanic ecosystems?
What role do diatoms play in oceanic ecosystems?
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How do diatoms remain suspended in the water column?
How do diatoms remain suspended in the water column?
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Study Notes
Diatoms and Golden Algae
- Group includes diatoms and golden algae (desmids), important in aquatic ecosystems.
- Found in both freshwater and marine environments, showcasing ecological diversity.
- Microscopic size allows them to float passively in water currents as plankton.
- Majority are photosynthetic, contributing to oxygen production and food webs.
Structure and Composition
- Diatom cell walls consist of two thin, overlapping shells resembling a soap box.
- Walls embedded with silica, making them indestructible and durable.
- Over billions of years, the accumulation of diatom cell wall deposits has formed ‘diatomaceous earth.’
Uses of Diatomaceous Earth
- Diatomaceous earth possesses a gritty texture, utilized in various applications.
- Employed in polishing agents, enhancing the shine of surfaces.
- Used for filtration purposes, particularly for oils and syrups, highlighting its practical importance.
Ecological Role
- Diatoms are the principal producers in oceanic environments, forming the base of marine food webs.
- Their photosynthetic activity is crucial for sustaining marine life and balancing ecosystems.
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