Chrysophytes - studybuddyshareline

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Chrysophytes

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Chrysophytes

Members:
- Diatoms
- Golden algae (desmids)
Habitat:
- Freshwater and marine environments
Characteristics:
- Microscopic
- Planktonic (float passively in water currents)
- Mostly photosynthetic
Diatoms:
- Unique cell walls:
  - Two thin overlapping shells (like a soapbox)
  - Embedded with silica (indestructible)
- Form diatomaceous earth:
  - Accumulation of cell wall deposits over billions of years
  - Gritty texture used in polishing, filtration of oils and syrups
- Chief producers in the oceans (major contributors to primary production)

Test: Chrysophytes

Check your knowledge from the topic: Chrysophytes

1 / 5

Why are diatoms referred to as “chief producers” in the oceans?

Because they produce a lot of oxygen

Because they are a major source of food for marine animals.

Because they help to filter pollutants from the water

Both a and b

2 / 5

Which of the following is NOT a use of diatomaceous earth?

Polishing

Building material for houses

Filtration of oils and syrups

Food source for whales

3 / 5

What is “diatomaceous earth”?

A type of soil formed from the accumulation of diatom cell walls.

A layer of the Earth’s crust rich in diamonds.

A type of algae found in freshwater.

A microscopic organism that floats in water currents.

4 / 5

What is a distinctive feature of diatoms’ cell walls?

They are made up of cellulose

They are soft and flexible

They form two overlapping shells embedded with silica.

They lack cell wall

5 / 5

Chrysophytes are typically found in which type of environment?

Only fresh water

Only marine (salty water)

Both fresh water and marine water

Desert environment

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The average score is 40%