1. Conidia: Conidiophores are formed from protozoan bacteria. Conidiophores produce tiny conidia. The conidia are arranged like chains. The mature conidia detach and germinate in a favorable environment to form new bacteria. For example, Streptomyces.
2. Gonidia: protoplasts of protoplasts of protozoan bacteria divide to form smaller parts in unfavorable environment. Cytoplasm accumulates around each segment to form gonidia. New bacteria are formed from the transformed gonidia. For example, Leucothris.
3. Zoospores: Bacteria produce zoospores in unfavorable environment. Zoospores produce new bacteria. Such as Azotobactor, Rhizobium.
4. Endospore: Bacterial protoplast shrinks and becomes spherical or ovoid due to lack of food in unfavorable environment. It is then enveloped by a thick coat and becomes an endospore. This is called a resting spore. New bacteria are born from resting spores under favorable conditions. For example, Bacillus subtilis, Clostridium tetanus, Escherichia coli.
5. Microcyst: Several cells of myxobacteria unite to form a swarm. Each cell of the swarm becomes a microcyst. New bacteria are born from microcysts. For example – Myxococcus fulvus, Chondromyces crocatus.