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  • Select the correct statement regarding phaeophyceae: A. Vegetative reproduction is by fragmentation B. Sexual reproduction is by biflagellate zoospores C. Zoospores are pear

Select the correct statement regarding phaeophyceae:

A. Vegetative reproduction is by fragmentation
B. Sexual reproduction is by biflagellate zoospores
C. Zoospores are pear shaped and have two equal laterally attached flagella

Option: 1

B and C
 


Option: 2

A
 


Option: 3

A and B
 


Option: 4

B
 


Answers (1)

best_answer

 

 

Phaeophyceae -

  • The members of Phaeophyceae are commonly called as Brown algae. Ex: Ectocarpus, Dictyota, Laminaria, Sargassum, Fucus
  • These are mostly found in Marine habitats. 
  • They are large sized and also known as Kelps (Laminaria, Macrocystis). 
  • Some forms are filamentous as in Ectocarpus.
  • Members of this group are olive green to brown in colour 
  • Major pigments present are chlorophyll a, c, carotenoids and xanthophylls (fucoxanthin).
  • The food is stored in the form of complex carbohydrates such as mannitol and laminarin.
  • The cell wall has cellulose covered by gelatinous substance Algin. Algins are component of phycocolloids.
  • The plant body consists of the holdfast, a short stipe and elaborate photosynthetic frond. Vegetative reproduction takes place by fragmentation.
  • Asexual reproduction is by Zoospore formation. These are pear-shaped and have two unequal lateral flagella. These flagella are tinsel and whiplash type.
  • Sexual reproduction is by isogamy, anisogamy and oogamy. 
  • Fertilisation takes place either outside or inside the oogonium. 
  • The male gametes are smaller and resemble the zoospores with two lateral flagella and pyriform shape.
  • Fucus and Laminaria are a rich source of iodine.
  • Durvillea has anti-worm properties.
     

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In phaeophyceae, vegetative reproduction is by fragmentation

Posted by

Pankaj Sanodiya

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