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Questions and Answers
Which group includes diatoms and golden algae?
Which group includes diatoms and golden algae?
- Euglenoids
- Slime moulds
- Dinoflagellates
- Chrysophytes (correct)
What unique feature characterizes the cell walls of diatoms?
What unique feature characterizes the cell walls of diatoms?
- Chitin composition
- Cellulose composition
- Lignin composition
- Silica composition (correct)
Which kingdom forms a link between those dealing with plants, animals, and fungi?
Which kingdom forms a link between those dealing with plants, animals, and fungi?
- Monera
- Fungi
- Plantae
- Protista (correct)
What type of reproduction do protists primarily undergo?
What type of reproduction do protists primarily undergo?
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Which group is known for forming a link with kingdoms dealing with plants, animals, and fungi?
Which group is known for forming a link with kingdoms dealing with plants, animals, and fungi?
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'Diatomaceous earth' results from the accumulation of cell wall deposits left by which organisms?
'Diatomaceous earth' results from the accumulation of cell wall deposits left by which organisms?
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Study Notes
Protista
- All single-celled eukaryotes are classified under Protista, but its boundaries are not well-defined.
- The kingdom includes Chrysophytes, Dinoflagellates, Euglenoids, Slime moulds, and Protozoans.
- Protists are primarily aquatic and form a link with other kingdoms like plants, animals, and fungi.
- As eukaryotes, protistan cells have a well-defined nucleus and membrane-bound organelles.
- Some protists have flagella or cilia.
Reproduction in Protista
- Protists reproduce both asexually and sexually.
- Sexual reproduction involves cell fusion and zygote formation.
Chrysophytes
- Chrysophytes include diatoms and golden algae (desmids).
- They are found in fresh and marine environments, and are microscopic plankton.
- Most chrysophytes are photosynthetic.
- Diatom cell walls are made up of two thin, overlapping shells that fit together like a soap box.
- The walls are embedded with silica, making them indestructible.
- The accumulation of diatom cell walls over billions of years is referred to as 'diatomaceous earth'.
- Diatomaceous earth is gritty and used in polishing, filtration, and other applications.
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