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L.S. 11
Algae
General characteristics:
● Eukaryotic
● ___________
● Cell walls of __________
● Photosynthetic autotrophs- ______________ and ____________
● Aquatic
● Reproduction: alternate ____________ with _____________
● No _____________ system to transport water and nutrients
Algae are classified into 7 phyla, based on:
● Colour (green, red, brown)
● Type of chlorophyll/accessory pigments
● Form of food storage
● Substance & cell wall composition
Structure
● Holdfast - to _________ algae to substrate
● __________ – large surface area for P.S.
● _________ – attach holdfast to blades
● Bladder or Float – gas filled bulb for _____________
Name:____________
Phlyum Chlorophyta (Green Algae)
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Single, ___________ & multicellular
Chlorophyll ___ & ____
_________ in colour
Store food as ___________
____________ cell walls
Live at ___________ of water or moist soil
Colonial Algae:
Groups of similar cells joined together,
but perform little if any specialized functions.
Example: Volvox
Example: Spirogyra
Example:
Phlyum Rhodophyta (Red Algae)
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Few unicellular, most large ________________
Chlorophyll ____ & ____, accessory pigments are ______________
________ in colour
Store sugars as ________________________
Cell walls w ________ &/or _______________
_____________ living algae
Porphyra used for nori in sushi
Phlyum Phaeophyta (Brown Algae)
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All ________________, largest forms
Chlorophyll ____ & ___, accessory pigment is _______________
Brown to __________________ in colour
Cell wall of ____________ and ___________
Food storage as _________________________ or oil
Laminaria
Fucus (rock weed)
Life Cycle
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Alternation of Generations
_____________ gametophytes produce ____________
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Gamete __________________ → diploid ____________
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Zygote matures to ________________ (__n)
Sporophytes produce _____________ (__n)
Ecological Role
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_________________________ – algae serves as first food source in aquatic food chain
____________ producer – large %
____________ for many species
Human Uses
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__________ source
______________
Food products – eg. Thickeners, ______________, & flavourings