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PLANT VARIETY-ALGAE AND SEA WEEDS

ALGAE  ARE   NOT  TRUE  PLANTS.They   form  a   diverse   group  of   plant  -  like   organisms  that  belong to  the  kingdom  protista .Like  plants ,   algae  possess   the  green  pigment   chlorophyll    and  make their  own  food   by    photosynthesis . Many  algae    also  possess   other  pigments &n bsp; by  which    they  can  be  classified ,   for  example ,  the  brown  pigment   fucoxanthin  is   found  in  the  brown   algae . Some   of  the   ten  phyla   of algae   are  excessively   unicellular  (single  celled ),  others  also  contain  aggregate  of  cells   in  filaments  or  colonies .
Three    phyla  -the  chlorophyta  (green  algae), rhodophyta (red   algae),  and   phaeophyta(brown  algae)-   contain   larger , multicellular ,  thalloid (flat).
Marine    organisms    commonly   known   as  seaweeds.Most  algae  can  reproduce   sexually  . For  example ,  in the  brown  seaweed  gametes  (sex cells)  are   produced  in   conceptacle(chambers) in  the  receptacles (fertile  tips  of  fronds);after  their  release  into  the  sea,antherozoids(male  gametes)  and  oospheres    (female   gametes)  fuse; the  resulting  zygote  settles  on  a  rock    and  develops  into  a  new  seaweed. algae .

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