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ALGAE (CHLOROPHYCEAE (CHLOROPHYLL (OTH PIGMENTS (CAROTENOIDS …
ALGAE
CHLOROPHYCEAE
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pigments
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chloroplasts are discoid ,plate like ,reticulate cup-shaped ,spiral ,ribbon shaped
most of them have more than one storage bodies called pyrenoids located in the chloroplasts pyrenoids contain proteins besides starch some algae may store food in the form of oil droplets
green algae usually have a rigid cell wall made of inner layer of cellulose and an outer layer of pectose
REPRODUCTION
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sexual reproduction may show variation in the type and formation of sex cells and it may be isogamous ,anisogamous ,oogamous
CHLOROPHYLL
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OTH PIGMENTS
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XANTHOPLHYLL ,eg fucoxanthin - yellow
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USES
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they are the primary producers of energy rich compounds which form the basis of food cycles of all aquatic animals
many species of PORPHYRA , LAMINARIA AND SARGASSUM are among the 70 species used as food
certain marine red and brown algae produce large amounts of hydrocolloids red algae - carrageen and brown algae - algin
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REPRODUCTION
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ASEXUAL BY PRODUCTION OF DIFFERENT TYPES OF SPORES -most common are the zoospores that are biflagellated pear shaped and on germination give rise to new plants
SEXUAL BY ISOGAMY ,ANISOGAMY ,OOGAMY- OOGAMY BY VOLVOX AND FUCUS
They are largely aquatic (both fresh water as well as marine )they occur in other habitats also like moist stones, soils, wood They are also in associations #with fungi = lichen and with animals #with sloth
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SEAWEED - COMMON NAME FOR SPECIES OF MARINE ALGAE AND PLANTS THAT GROW IN THE OCEAN AS WELL AS IN RIVERS, LAKES AND OTHER WATER BODIES
