Question

Which symbiotic Algae are found in the secretory cells of Hydra?
1. Chlorellaceae
2. Prototheca
3. Helicosporidium
4. Zoochlorella

Answer 1

Correct Answer - Option 4 : Zoochlorella

The Correct Answer is ​Zoochlorella.

• Zoochlorella is the symbiotic algae are found in the secretary cell of hydra.
• Zoochlorella, plural zoochlorellae, small green alga (often Chlorella) or, sometimes, a flagellate protozoan, that lives within the bodies of various freshwater protozoans and invertebrates. 
  • Zoochlorellae often color their hosts green (eg green hydra and green Paramecium bursaria). 

• Chlorellaceae
  • They are a family of green algae in the order Chlorellales. This genus includes some important emerging pathogens of humans and farm animals, such as Prototheca zopfii.
• Prototheca
  • It is a genus of algae in the family Chlorellaceae. All the species within this genus, even though classified as green algae, have forfeited their photosynthetic ability and have switched to parasitism.
• Helicosporidium
  • It is a genus of green algae in the class Trebouxiophyceae. It is a parasite found in the gut of insects, and a close relative of Prototheca.