11th Biology

Chapter 6 (Kingdom Monera) F.Sc 1st Year Biology Short Questions

What do you know about accessory and photosynthetic pigments of cyanobacteria?

Cyanobacteria use phycobilins. as accessory pigments. Photosynthetic pigments and electron transport chain components are located in thylakoid membranes linked with particles called phycobilisomes. Phycocyanin pigment is their predominant phycobilin and CO2 in them is assimilated through the Calvin cycle.

What is the difference between cyanobacteria and plants regarding their reserve food?

Reserve food material in cyanobacteria is glycogen but in plants it is starch.

How cyanobacteria reproduce?

Cyanobacteria reproduce by binary fission and fragmentation. In cyanobacteria hormogonia, akinetes and heterocysts are present.

Give economic importance of cyanobacteria.

  • Cyanobacteria have heterocysts, which are helpful in the fixation of atmospheric nitrogen
  • They help in reclamation of alkaline soils
  • They release O2 in the environment due to their photosynthetic activity
  • Oscillatoria and few other cyanobacteria can be used as pollution indicator
  • They have symbiotic relationship with protozoa, fungi, and nitrogen fixing species of angiosperms
  • Super Blue green algae is basically expensive pond scum. In which cyanobacteria is a single celled organism that produce its own food through photosynthesis
  • Many species of cyanobacteria form water blooms, where they often  give unpleasant smell and make water unfit for consumption
  • Some species produce toxins that kill livestock and other animals that drink the water
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