Class sporozoa of phylum protozoa is characterised by

The correct option is A Parasitism
Members of the phylum Sporozoa have simple body organisation due to their parasitic mode of life; all of them being endoparasitic and pathogenic. Locomotory and food-capturing sub-structures are absent due to a parasitic life. The mode of nutrition is always heterotrophic and saprozoic. Sporozoa generally show alternation of generation between asexual and sexual generation and are monogenetic or diagenetic. Life cycle always involves the formation of haploid cells called sporozoites. Thus, the correct answer is option C.