TLS Online TPP Program

#Question id: 10366


Cyanobacteria can fixes nitrogen in an anaerobic conditions. Which of the following statements about heterocyst which is specialized cell of blue-green algae is incorrect?

#Unit 6. System Physiology – Plant
  1. Anaerobic conditions are created in specialized cells called heterocysts, it appear to represent an adaptation for nitrogen fixation
  2. A heterocyst in a nonfilament of the nitrogen-fixing cyanobacterium Anabaena, which forms associations with the water fern Azolla
  3. Heterocysts are thick-walled cells that differentiate when filamentous cyanobacteria are deprived of NH4 +
  4. These cells lack photosystem II, the oxygen-producing photosystem of chloroplasts, so they do not generate oxygen