Green Algae, Red Algae and Brown algae are grouped under the class Rhodophyceae
The comparison or difference between red algae(rodopyceae) and green algae(chloropyceae) and brown algae (Phaeopycea) are as follows :
Chloropyceae - Green
Algae
1.They are mostly found is freshwater form. (eg: Spirogyra sp, Chlamydomonas sp etc)
2. They are found mostly in Plantonic for i.e free floating form (eg: Spirogyra sp) and few are found in benthic form (eg : Ulothrix sp)
3. They store their reserved food in the form of starch.
4. The cell wall of Green Algae or Chloropyceae is made up outer pectose layer and inner cellulosic layer.
5. They contain photosynthetic pigment like chlorophyll a and b and xanthophyll and carotenoid.
6. They are found in the range of microscopic unicellular and multicellular form.
7.Green algae reproduce by vegetative propagation by fragmentation,stolon , reproduce asexually by motile zoospore, apalanospore akinetic etc and sexuall reproduction is of isogamous, oogamous and anisogamous type.
Phaeopycea - Brown algae
1.They are mostly found is marine(eg : Fucus sp) form and few are found in freshwater form. (eg : Pleurocladia sp)
2.
They are found mostly in Benthic form (eg: Fucus sp) and few are found in
Plantonic
form (eg : Laminaria sp)
3. They
store their reserved food in the form of mannitol or laminarin.
4. The
cell wall of Phaeopycea or Brown algae is made up outer phycocolloid
layer and inner cellulosic layer.
5.They
are found in the multi-cellular form and unicellular form is
unknown.
6. They
contain photosynthetic pigment like chlorophyll a and c and xanthophyll and
carotenoid. Brown
colour is due to dominance of xanthophyll such as Fucoxanthin.
7. Brown
algae reproduce by reproduce asexually by formation of motile or non-motile
spores etc and sexual reproduction is of isogamous, oogamous and anisogamous
type.
Rodophyceae
- Red algae
1. 1.They
are mostly found is marine(eg : Polysiphonia sp) form and few are found in freshwater
form. (eg : Batrochospermom sp)
2. They
are found mostly in Benthic form (eg: Polysiphonia sp) and few are
found in
Plantonic
form (eg : Batrochospermom sp)
3. They
store their reserved food in the form of floridean starch.
4. The
cell wall of Rodophyceae - Red algae is made up outer pectic layer
and inner cellulosic layer.
5. They
are found mostly in the form and multi-cellular form and few are found in
uni-cellular form.
6. They
contain pigment phcyobilin such as phycoerthyrin (Red colour is due
to dominance of phycoerthyrin)and phycocyanin (Blue colour).
7. Red
algae reproduce asexually by formation of non-motile spores such as
carpospore, nuetral spore, meiospore , monospore etc and sexual reproduction is
of oogamous type only.
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