Submerged aquatic plants are different from terrestrial plants in that they can use HCO₃⁻ as a carbon source for photosynthesis.

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Submerged aquatic plants have adapted mechanisms to utilize bicarbonate (HCO₃⁻) as a source of carbon for photosynthesis, a process known as bicarbonate use or HCO₃⁻-utilization. This adaptation allows them to survive in aquatic environments where dissolved CO₂ concentrations are low or limited. Terrrestrial plants, on the other hand, rely on atmospheric CO₂ for their carbon source.

Submerged Aquatic Plants Are Different from Terrestrial Plants in That