Algae classes Flashcards
What are the characteristics of Chlorophyceae (green algae)?
Characteristics include unicellular colonial filamentous forms and great variation in shape and form.
What pigments are found in Chlorophyceae?
Chlorophyll a and b.
What types of water do Chlorophyceae typically inhabit?
Brackish water, fresh water, and salty water.
What type of reproduction do Chlorophyceae undergo?
They reproduce vegetatively, sexually, and asexually.
What are some examples of Chlorophyceae?
Chlamydomonas, Volvox, Ulothrix, spirogyra, and Chara.
What are the characteristics of Phaeophyceae (brown algae)?
Characteristics include a filamentous form, simple to branched structures, and some can grow up to 100 m in height.
What pigments are found in Phaeophyceae?
Chlorophyll a, chlorophyll c, carotenoids, and fucoxanthin.
What types of water do Phaeophyceae typically inhabit?
Brackish water, fresh water, and mostly marine environments.
What is the food storage body in Phaeophyceae?
Complex carbohydrates like laminarin or mannitol.
What is a unique feature of Phaeophyceae’s cell wall?
It has a cellulosic wall covered by a gelatinous coating of algin.
What are the characteristics of Rhodophyceae (red algae)?
They are mostly multicellular and have red thalli.
What pigments are found in Rhodophyceae?
Chlorophyll a, chlorophyll d, and red pigment known as phycoerythrin.
What types of water do Rhodophyceae typically inhabit?
Brackish water, fresh water, and mostly marine environments.
What is the food storage body in Rhodophyceae?
Floridean starch which is very similar to amylopectin and glycogen in structure.
What is a unique feature of Rhodophyceae’s cell wall?
They have a rigid cell wall with an inner layer of cellulose and an outer layer of pectose.
What forms of reproduction do Rhodophyceae undergo?
They reproduce vegetatively, sexually (isogamous, anisogamous, or oogamous), and asexually.
What is unique about the gametes of Rhodophyceae?
Gametes are pear-shaped (pyriform) with 2 laterally attached flagella.
What is notable about the chloroplasts in green algae?
Chloroplasts may show a variety in shapes in different species.
What do Brown algae typically attach to their substratum with?
A holdfast which may have a stalk (stipe) and leaf-like photosynthetic organ (frond).
What is a method of vegetative reproduction observed in algae?
Fragmentation.
What is the general habitat of red algae?
They occur in well-lighted regions close to the surface of water and at great depths in oceans where relatively little light penetrates.
What type of reproductive developments do oogamous species have?
Complex post-fertilisation developments.
What type of spores are produced by non-motile gametes in Rhodophyceae?
Flagellated zoospores produced in zoo sporangia.
What are the examples of Brown Algae?
Ectocarpus, Dictoyota, Laminaria, Sargassum, and Fucus.
What are examples of filamentous forms of brown algae?
Ectocarpus.
What are the examples of Red Algae?
Garcilaria, Gelidium, Porphyra, and Polysiphonia.
