13 public questions tagged with this topic.
The kidneys filter nitrogenous waste from the blood and help maintain osmoregulation.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Circulatory and Excretory System
The gall bladder stores bile secreted by the liver and releases it into the duodenum for digestion.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Anatomy - Digestive and Respiratory System
Frogs use mimicry to blend into their surroundings, helping them avoid predators.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Morphology and External Features
Frogs undergo external fertilization where male frogs release sperm over eggs laid by females in water.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Frog - Morphology and External Features
Frogs excrete urea as their primary nitrogenous waste and are classified as ureotelic animals.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Animal Tissues - Muscular and Neural Tissue
Unlike mammalian RBCs, frog RBCs are nucleated and contain hemoglobin for oxygen transport.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Animal Tissues - Muscular and Neural Tissue
The olfactory lobes in a frog’s brain are responsible for the sense of smell.
Ref: NCERT Class 11 Biology Chapter 7: Structural Organisation in Animals Animal Tissues - Muscular and Neural Tissue
Condition possessing two separate external nostrils or nares connected via internal choanae to buccal cavity is termed dirhinous derived from Greek di two and rhinos nose, representing standard gnathostome vertebrate arrangement including fishes, amphibians, reptiles, birds and mammals where paired olfactory sacs sample water or air bilaterally improving gradient detection. Monorhinous or monorhiny describes single median nostril in cyclostomes lamprey and hagfish, trirhinous hypothetical anomaly, polyrhinous multiple irregular openings pathological not evolutionary term. Dirhiny facilitates bilateral olfaction and respiratory flushing through nasal passages.
Ref: Romer Vertebrate Body 6th ed. Nasal Terminology; Campbell Biology 12th ed. Chapter 34 Olfactory Evolution
Amphibians possess both hepatic and renal portal systems. Hepatic portal collects deoxygenated nutrient-rich blood from stomach, intestine, spleen via hepatic portal vein into hepatic sinusoids for detoxification, glycogen storage and plasma protein synthesis before returning to sinus venosus via hepatic veins. Renal portal connects veins from hindlimbs and pelvis to kidney peritubular capillaries enabling tubular secretion and reabsorption before caval return, aiding nitrogenous waste handling. Both present well developed not absent, double circulation separate phenomenon, illustrates ectothermic low-pressure pattern with portal routes.
Ref: Romer Vertebrate Body Portal Systems; NCERT Class 11 Chapter 18 Portal Circulation Amphibians
Erythrocytes of amphibians characteristically large, oval to elliptical, nucleated retaining central nucleus capable of transcription throughout lifespan, containing hemoglobin within cytoplasm, size up to 20-70 micrometres exceeding mammalian cells dramatically, reflecting large genome including 20-120 picogram DNA content in salamanders. Oval nucleated shape reduces surface to volume but sufficient for low metabolic rate and continuous erythropoiesis in bone marrow and spleen. Enucleated biconcave discs optimize deformability and hemoglobin packing in mammals only, spindle shaped not typical amphibian trait. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative morphology
Ref: Campbell Biology 12th ed. Chapter 42 Vertebrate Blood Cells; NCERT Class 11 Biology Chapter 18 RBC Morphology
Amphibian heart three-chambered architecture comprises two separate atria left atrium receiving oxygenated blood from pulmonary veins and cutaneous veins, right atrium receiving deoxygenated systemic venous blood via sinus venosus, and single undivided ventricle with trabeculae carneae and spiral valve within conus arteriosus partially directing streams reducing mixing. Systemic and pulmocutaneous circuits partially overlapping, less efficient than four-chambered avian mammalian. Sinus venosus and truncus arteriosus prominent embryonic remnants persisting, reflecting transition between two-chambered fish heart and fully septated amniote heart. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative
Ref: NCERT Class 11 Chapter 18 Amphibian Circulatory System; Campbell Biology 12th ed. Chapter 42 Heart Evolution
Skull of amphibians described as dicondylic bearing two occipital condyles formed by paired exoccipital ossifications bordering foramen magnum articulating with atlas first cervical vertebra permitting nodding and lateral head movements assisting prey capture on land. Paired condyles provide stable yet flexible craniovertebral joint essential after emergence from water. Reptiles and birds exhibit single monocondylic median condyle formed largely by basioccipital allowing rotation, mammals also dicondylic differing in exoccipital contribution. Acondylic condition lacking condyles not seen. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative morphology and evolutionary taxonomy within animal and fungal diversity.
Ref: Romer & Parsons Vertebrate Body 6th ed. Skull Condyles; NCERT Class 11 Biology Chapter 4 Amphibian Skull
