Photosynthesis is absent in:

Explanation

Mushrooms, being fungi, do not have chlorophyll and therefore cannot perform photosynthesis. Seaweeds, purple sulphur bacteria, and angiosperms all contain pigments that allow them to conduct photosynthesis, albeit through different mechanisms. Seaweeds and angiosperms use chlorophyll, while purple sulphur bacteria utilize bacteriochlorophyll, enabling them to harness light energy to create food.