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  • In the five kingdom classification, Chlamydomonas and Chlorella have been included inOption: 1 Monera<div class='qna-

In the five kingdom classification, Chlamydomonas and Chlorella have been included in

Option: 1

Monera


Option: 2

Protista


Option: 3

Plantae


Option: 4

Animalia


Answers (1)

best_answer

Algae and their characteristics -

  • Algae are chlorophyll - bearing, thalloid, avascular plants and are usually aquatic.

  • Eg. Chlamydomonas, Volvox.

  • Some of them form lichens along with fungi, some are epizoic on shells and sloth bear (algae Trichophilus welckeri). Some are present on moist stones, wood and soil.

  •  Algae can be:

  • unicellular flagellates like Chlamydomonas,  

  • unicellular non-flagellates like Chlorella, colonial flagellates like Volvox, 

  • coenobial non- flagellates like Scenedesmus, 

  • unbranched filamentous forms like Spirogyra and  Ulothrix, 

  • branched filamentous like Cladophora, heterotrichous like Fritschiella, 

  • forms with nodal and intermodal demarcation like Chara

  • massive body as in case of Kelps like Macrocystis (largest algae) and Laminaria.

  • Reserve food is mainly starch. 

  • Their cell wall is made up of cellulose, galactans and mannans

  • Vascular tissue is absent.

  • Vegetative reproduction occurs by fragmentation.

  • Asexual reproduction occurs with the help of motile zoospores containing flagella.

  • Sexual reproduction takes place by syngamy i.e. fusion of gametes. 

  • Syngamy can be isogamy when fusing gametes are similar, anisogamy when fusing gametes are dissimilar or oogamy when female gamete is larger and non-motile while male gamete is smaller and motile. 

  • Embryo formation is absent. 

  • They increase the O2 level in their environment. 

Chlamydomonas and Chlorella are unicellular and eukaryotic. So they were kept under kingdom Protista. In five kingdom classification, Chlamydomonas and Chlorella (earlier placed in algae within plants and both having cell walls) have been included in kingdom protista. 

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