Reproduction in bacteria is shown in following diagram. Select the correct match.

Step-by-step solution

Reproduction: Mainly by fission (during favorable conditions). These also reproduce by spore formation (during unfavorable conditions) or by primitive type of DNA transfer from one bacteria to another. Heterotrophs are most abundant in nature. These also play important role in curdling of milk, production of antibiotics, nitrogen fixation in legumes, etc.