Practice questions covering Phylum Porifera and Cnidaria, including their characteristics and classification. Useful for biology exam preparation.
Obelia, a cnidarian, exhibits metagenesis where polyps reproduce asexually and medusae reproduce sexually.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Cnidoblasts (stinging cells) in cnidarians are used for defense and capturing prey by injecting toxins.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Spongilla is a freshwater sponge, whereas Sycon and Euspongia are marine sponges.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Reptiles are uricotelic, meaning they excrete uric acid, not urea.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Mammals have a complete double circulation, meaning oxygenated and deoxygenated blood do not mix.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Mammals are warm-blooded (homeothermic), not cold-blooded (poikilothermic).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Cnidarians digest food partially in the gastrovascular cavity (extracellular digestion), and further digestion occurs inside cells (intracellular digestion).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Cnidarians have an incomplete digestive system with a single opening serving as both mouth and anus.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Sponges (Phylum Porifera) exhibit intracellular digestion as they lack a digestive cavity.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Frogs undergo indirect development with a larval stage (tadpole) that metamorphoses into an adult.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Mammals have a four-chambered heart, not a three-chambered one.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Both birds and mammals are warm-blooded (endothermic), meaning they maintain a constant internal body temperature.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
