Section 2 Flashcards
(21 cards)
What are algae?
Algae are mostly unicellular and sometimes multicellular plant-like protists that produce food through photosynthesis.
What is the body structure of algae called?
The body of algae is called thallus.
How are algae classified?
Algae are classified into 4 types based on their structure: unicellular, colonial, filamentous, and multicellular.
What are unicellular algae?
Unicellular algae consist of single cells and are mostly aquatic, like Chlamydomonas, which form phytoplankton.
What are colonial algae?
Colonial algae, like Volvox, have a structure made of a group of cells.
What are filamentous algae?
Filamentous algae, like Spirogyra, have a slender rod shape.
What are multicellular algae?
Multicellular algae have large leaf-like structures, for instance, Ulva.
How do algae reproduce?
Algae reproduce both sexually and asexually.
How are algae grouped?
Algae are grouped into 7 phyla based on color, type of chlorophyll, cell wall composition, and food storage substances.
What is common among all algae?
All algae have chlorophyll A and some may have different chlorophylls and accessory pigments.
What is Phylum Chlorophyta?
Phylum Chlorophyta includes green algae that live in aquatic or terrestrial environments and have chlorophyll A and B.
What is Phylum Phaeophyta?
Phylum Phaeophyta includes brown algae, mostly large multicellular marine organisms like seaweed and giant kelp.
What is the pigment in brown algae?
Brown algae appear brown due to the pigment fucoxanthin.
What is Phylum Rhodophyta?
Phylum Rhodophyta includes red algae that live in fresh water or on land, mostly as marine seaweeds.
What pigments do red algae contain?
Red algae contain chlorophyll A and phycobilins, which are red and blue pigments.
What is Phylum Bacillariophyta?
Phylum Bacillariophyta includes diatoms found in both fresh water and marine environments.
What is unique about diatom cell walls?
Diatoms have a unique cell wall called shells made of two interlocking parts called valves.
What is Phylum Dinoflagellata?
Phylum Dinoflagellata includes mostly small, unicellular, photosynthetic organisms.
What phenomenon can dinoflagellates cause?
When their population grows rapidly, dinoflagellates can cause red tide.
What is Phylum Chrysophyta?
Phylum Chrysophyta includes gold algae, mostly found in fresh water and some in marine environments.
What is Phylum Euglenophyta?
Phylum Euglenophyta includes organisms like Euglena, which are plant-like and animal-like.
