how to classify algae
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Answers
There is three main Algae classification: Chlorophyceae – These are called green algae, due to the presence of pigments chlorophyll a and b. ... Phaeophyceae – Also called as brown algae, they are predominantly marine. They have chlorophyll a, c, carotenoids and xanthophyll pigments.
Answer:
Algae is classified into Chlorophyceae, Phoeophyceae , Rhodophyceae on the basis of their pigment composition and nature of food reserve.
Chlorophyceae:
→ It is commonly called as the green algae.
→ It is mainly found in freshwater and saline water.
→ The major pigments present are Chlorophyll a and b.
→ The body is filamentous and unicellular and is colonial.
→ It has 2 to 8 equal sized flagella and is apically positioned.
→ The cell wall is composed of cellulose.
→ The reserve food material is stored in the form of starch.
→ The asexual reproduction is done by fragmentation and by flagellated zoospores.
→ The sexual reproduction is isogamous, anisogamous and oogamous.
→ Some common examples are Chara, Ulothrix, Spirogyra etc.
Pheophyceae:
→ It is commonly called as the brown algae.
→ It is mainly found in saline water.
→ The major pigments present are Chlorophyll a, c and fucoxanthin.
→ The body is profusely branched and filamentous.
→ It has 2 unequal flagellas which are laterally positioned.
→ The cell wall is composed of cellulose and algin.
→ The reserve food material is stored in the form of mannitol and laminarin.
→ The asexual reproduction is done by fragmentation and biflagellated zoospore.
→ The sexual reproduction is isogamous, anisogamous and oogamous.
→ Some common examples are Sargassum, Ectocarpus etc
Rhodophyceae:
→ It is commonly called as the red algae.
→ It is mainly found in saline water.
→ The major pigments present are Chlorophyll a, d and phycoerythrin.
→ The body is multicellular.
→ Flagella is absent.
→ The cell wall is composed of cellulose, pectin and polysulphate esters.
→ The reserve food material is stored in the form of floridean starch.
→ The asexual reproduction is done by fragmentation and non motile spores.
→ The sexual reproduction is oogamous.
→ Some common examples are Porphyra, Gracilaria, Gelidium etc.