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Biology Chapter 20 Section 2 Algae
Transcript of Biology Chapter 20 Section 2 Algae
Dinoflagellates have two flagella that fit in grooves between two thick plates of cellulose that protect the cell. Dinoflagellates Plantlike protists are commonly called “algae” and are grouped as either green, brown, or red.
Green algae (Chlorophyta):
Brown algae (Phaeophyta)
Red algae (Rhyodophyta).
red seaweed Plantlike Protists The base of most marine food chains is made up of
chrysophytes. Which of the following describes structures found in euglenophytes?
chloroplasts but no cell walls
chloroplasts and cell walls
cell walls but no chloroplasts
no cell walls or chloroplasts The function of accessory pigments in various groups of algae is to
absorb red and violet light.
carry out photosynthesis in the absence of chlorophyll.
increase the range of wavelengths used for photosynthesis.
carry out photosynthesis when sunlight is not available. Euglenophytes are plantlike protists that have two flagella but no cell wall. Euglenophytes Plantlike protists with gold-colored chloroplasts are the
dinoflagellates. Phytoplankton constitute the population of small, photosynthetic organisms found near the surface of the ocean.
Phytoplankton carry out half of Earth’s photosynthesis. In addition, they provide nourishment for many organisms. Ecology of Unicellular Algae Members of the phylum Chrysophyta are a diverse group of plantlike protists that have gold-colored chloroplasts. Chrysophytes Chlorophyll and Accessory Pigments Chlorophyll and accessory pigments allow algae to harvest and use the energy from sunlight.
Accessory pigments increase the range of light used for photosynthesis. Diatoms produce thin, delicate cell walls rich in silicon (Si)—the main component of glass.
The walls are shaped like the two sides of a petri dish or flat pillbox, with one side fitted snugly into the other.
Movement occurs with cilia. Diatoms Plantlike Protists: Algae Nucleus Chloroplast Carbohydrate
storage bodies Contractile vacuole Pellicle Eyespot Flagella Gullet Euglenophytes Euglena How can this
be bad for other organisms? Spirogyra Volvox Brown Algae (Phaeophyta) This group of algae includes hundreds of seaweed species.
They are found in deeper water than green algae. Red Algae (Rhodophyta) Many seaweed species are also found classified in this group of algae.
Red algae is generally found in water deeper than that of both green and brown algae species.