1. Heterotrophic microorganisms must take organic matter as carbon source and inorganic matter or organic matter as nitrogen source. Some even need different growth factors to gain energy through oxidation and grow microorganisms.

Reason: Heterotrophic microorganisms can't directly synthesize inorganic substances into organic substances, and must take ready-made organic substances to maintain a nutritious lifestyle.

2. Autotrophic microorganisms use carbon dioxide as the main or only carbon source.

Reason: Autotrophic microorganisms can obtain energy through bacterial photosynthesis or chemical synthesis, and inorganic nitrides are used as nitrogen sources.

Extended data

1. Heterotrophic microorganisms can be divided into saprophytic microorganisms and parasitic microorganisms in nature. According to the different energy required for microbial growth, it can be divided into light energy: heterotrophic microorganisms and chemotactic heterotrophic microorganisms. Most microorganisms are chemotactic heterotrophic.

2、? Heterotrophic relative autotrophic; Plants are basically autotrophic and animals are basically heterotrophic. Heterotrophication includes growth, parasitism and saprophy.

Saprophytic organism Most molds, bacteria, yeast and some higher plants are saprophytes. Aerobic decomposition of saprophytic bacteria in soil is a necessary link of material circulation.

Baidu encyclopedia-heterotrophic

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