About the description of photosynthesis and chemical synthesis, it is correct that (1) both belong to heterotrophs's nutrition mode, and (2) both belong to autotrophs.

(1), they will CO2 and water into organic matter, so all belong to autotrophic nutrition, (1) wrong;

(2) They all hydrate CO2 into organic matter, so they all belong to the nutritional model of autotrophs, which is correct;

③ Photosynthesis utilizes light energy, and chemical synthesis utilizes chemical energy released during redox reaction. 3 mistakes;

④ Photosynthesis is to use light energy to synthesize organic matter from CO2 and H2O, and chemical synthesis is to synthesize organic matter from CO2 and H2O, which is correct;

⑤ Photosynthesis needs light, but chemical synthesis does not. ⑤ Error.

Therefore, choose: B.

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