8 public questions tagged with this topic.
Amoebiasis, also known as amoebic dysentery, is caused by Entamoeba histolytica, a protozoan parasite.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Common Diseases - Protozoan - Malaria Amoebiasis
Amoebiasis is caused by the protozoan Entamoeba histolytica, which infects the intestine.
Ref: NCERT Class 12 Biology Chapter 7: Human Health and Disease Common Diseases - Protozoan - Malaria Amoebiasis
Red Queen hypothesis reflects key principle in quiz on type of evolution+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Red Queen hypothesis aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Red Queen hypothesis fits helps integrate natural selection, environment.
Ref: Futuyma, Evolution, Chapter 2: Homology, Convergence, Coevolution.
Tapeworms within class Cestoda exhibit highly specialized body plan for intestinal endoparasitism in vertebrate hosts. Scolex serves as holdfast organ bearing four muscular suckers and, in Cyclophyllidea, retractable rostellum with hooks anchoring firmly to host mucosa resisting peristalsis. Immediately behind lies proliferative neck generating strobila composed of serial proglottids, each containing complete set of hermaphroditic reproductive organs maturing anteroposteriorly becoming gravid containing eggs. Nutrient absorption occurs across syncytial tegument due to absent alimentary canal.
Ref: Campbell Biology, 12th ed., Chapter 33: Cestoda scolex proglottids parasitic adaptations
Giardia intestinalis synonym Giardia lamblia duodenalis belongs to order Diplomonadida in supergroup Excavata, diagnosed by binucleate trophozoite with adhesive ventral disc composed of microtubule spiral providing attachment to intestinal microvilli, four pairs of flagella, and median bodies. Inhabiting anaerobic duodenum, it lacks conventional mitochondria possessing instead microaerophilic mitosomes. Transmission occurs through quadrinucleate cysts in contaminated water causing malabsorptive diarrhea. SSU rRNA phylogeny places it among diplomonads alongside Spironucleus, distinctly separate
Ref: CDC DPDx Giardiasis Giardia intestinalis diplomonad; Harrison Principles Internal Medicine diplomonads binucleate parasite adhesive disc
