Latest questions in this category.
Platyhelminthes (flatworms) are triploblastic, acoelomate, and bilaterally symmetrical, but they lack a circulatory system.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Echinoderms exhibit bilateral symmetry in the larval stage, which later transforms into radial symmetry in adults.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Cartilaginous fishes lack an operculum and instead have gill slits for respiration.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Annelids do not have Malpighian tubules; they use nephridia for excretion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Hemichordates possess a stomochord in the collar region, which is similar in function to the notochord but structurally different. This places them between non-chordates and chordates.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Annelids exhibit metameric segmentation, meaning their body is divided into repetitive segments.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Aschelminthes (nematodes) are bilaterally symmetrical, not radially symmetrical.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Platyhelminthes have an incomplete digestive system, meaning they have only one opening for ingestion and egestion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Birds are uricotelic, meaning they excrete uric acid, not urea.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Aschelminthes (roundworms) are pseudocoelomates, meaning their body cavity is partially lined with mesoderm.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
Vertebrates evolved a well-developed endoskeleton that provides structural support, protection, and efficient movement.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
In an open circulatory system (e.g., Arthropods), blood is pumped into open spaces (hemocoel), facilitating direct diffusion of gases and nutrients. In a closed system (e.g., Annelids, Chordates), blood circulates within vessels.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
