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Rhodophyceae or Red Algae MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Rhodophyceae is considered one of the most asked concept.

  • 21 Questions around this concept.

Solve by difficulty

Algae have cell wall made up of:

Which one of the following statements is wrong ?

Concepts Covered - 1

Rhodophyceae
  • The members of Rhodophyceae are commonly called red algae. Eg. Polysiphonia, Porphyra, Gelidium etc. 
  • They mostly live in warmer marine waters.
  • The thallus is usually multicellular and some even have complex organization.
  • Cell wall contains cellulose and pectin along with phycocolloids and carrageenan.
  • They have chlorophyll a and d. 
  • The red colour is due to R-Phycoerythrin. 
  • It also has a phycocyanin. 
  • Due to the presence of Phycoerythrin they can grow in deep waters where other algae cannot grow.
  • The reserve food is Floridean Starch which is similar to amylopectin and glycogen. 

Reproduction in Rhodophyceae:

  • Vegetative reproduction takes place by fragmentation. 
  • Asexual reproduction by non-flagellate spores called as archaeospores, neutral spores and mono spores.
  • Sexual reproduction takes place by oogamy. 
  • The female sex organ is carpogonium with a single egg cell and male sex organ spermatangium with non-motile male gametes called as spermatia. 
  • This algal group shows post fertilisation changes also. 

Economic importance of Rhodophyceae:

  • Red algae (Rhodophyceae) used in preparing solid food media in laboratories and as a thickening and binding agent in food industries.
  • Agar-agar is obtained commercially from Gelidium and Gracilaria.
  • Red algae (Rhodophyceae) used in pharmaceutical, textile, leather and cosmetic industries obtained from Chondrus crispus.
     

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Rhodophyceae

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