Nematodes mainly have longitudinal muscles and lack circular muscles. Their movement is a whip-like thrashing produced against the elastic cuticle and pseudocoelomic fluid. This MCQ belongs to the Nematoda topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Most bivalves are filter feeders. Their gills function in both gas exchange and food collection, while the radula is absent. This MCQ belongs to the Bivalvia topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Sponges show cellular level organization. Their cells perform specialized functions, but they are not organized into true tissues, organs, or organ systems. This MCQ belongs to the Porifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Cnidarians are diploblastic animals because they develop from two germ layers. The mesoglea lies between epidermis and gastrodermis but is not a true mesodermal layer. This MCQ belongs to the Cnidaria topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Many flatworms, especially parasitic forms like tapeworms, are hermaphroditic. This increases reproductive success when mates are limited inside a host. This MCQ belongs to the Platyhelminthes topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Rotifers possess a corona, a ciliated crown that helps in locomotion and feeding. The beating cilia may appear like rotating wheels under the microscope. This MCQ belongs to the Rotifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Entamoeba histolytica causes amoebiasis or amoebic dysentery. The parasite invades the intestinal wall and may produce ulcers, abdominal pain, and blood or mucus in stool. This MCQ belongs to the Entamoeba histolytica topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Gemmules are resistant internal buds produced by many freshwater sponges. They allow survival during harsh conditions and can develop into new sponges when conditions improve. This MCQ belongs to the Porifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Cnidarians have a nerve net, a diffuse nervous arrangement suitable for radial animals. It coordinates simple movements and responses without forming a centralized brain. This MCQ belongs to the Cnidaria topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Many flatworms have an incomplete digestive tract with a single opening. Food enters and undigested material exits through the same opening. Tapeworms are an exception because they lack a gut entirely. This MCQ belongs to the Platyhelminthes topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
The mastax is a muscular pharynx in rotifers containing trophi, which function like jaws for grinding food. This is a diagnostic feature of Rotifera. This MCQ belongs to the Rotifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
Plasmodium causes malaria and is transmitted by female Anopheles mosquitoes. Its life cycle includes stages in human liver and blood cells as well as sexual stages in the mosquito. This MCQ belongs to the Plasmodium topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.
