In which of the following species does holozoic nutrition occur?

Holozoic nutrition refers to a type of nutrition in which an organism consumes solid food particles and then internally digests them to extract the required nutrients. Animals, including humans, regularly consume this kind of diet.

Paramecium has the holozoic mode of nutrition.

Earthworms are heterotrophic organisms that obtain their nutrition by ingesting organic matter from the soil. They are detritivores and feed on dead plant and animal material, as well as organic matter in the soil.

Plasmodium obtains its nutrition by feeding on the haemoglobin in red blood cells.

Hence, the correct option is Paramecium.