While comparing invertebrate groups, a student examines Plasmodium and fails to find cilia, flagella, or pseudopodia in the mature blood stages. The feature being tested is:

Correct Answer: A

absence of typical locomotory organelles in adult stage

Many sporozoans, including Plasmodium, lack obvious locomotory organelles in mature stages. They are parasitic protozoans with complex life cycles and specialized stages for invasion and transmission. This MCQ belongs to the Sporozoans topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.