Wednesday, October 19, 2016

HSEB notes | Difference Between Green Algae, Red Algae and Brown algae


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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