84 public questions tagged with this topic.
Organisms are primarily classified based on morphological characteristics in taxonomy. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Species is the most specific taxonomic rank, and organisms within a species share the most characteristics. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
The correct taxonomic hierarchy is: Species → Genus → Family → Order → Class → Phylum → Kingdom. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Classification helps categorize organisms into convenient groups based on shared characteristics. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Classification helps group organisms based on similarities and differences, making identification and study easier. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
CH₃CH₂CH₂NH₂ has one alkyl group attached to nitrogen, making it a primary aliphatic amine, as per the PDF’s classification.
Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions
Sea urchins display classic echinoderm traits that place them firmly within phylum Echinodermata alongside starfish, brittle stars, and sea cucumbers. Adults show pentaradial symmetry, endoskeletal ossicles with spines, and a water vascular system operating tube feet for locomotion and feeding. Embryologically they are deuterostomes with radial cleavage, enterocoelic coelom formation, and blastopore becoming anus, aligning them phylogenetically closer to chordates than molluscs or arthropods. Bilateral larvae metamorphose into radial adults, confirming echinoderm affiliation rather than chordate, molluscan, or arthropod body plans.
Ref: Gilbert, Developmental Biology, 12th ed., Chapter 1: Echinoderm embryology and phylogenetic position within Deuterostomia.
Ecosystems are categorized as terrestrial, aquatic, and man-made. Biotic is a component of an ecosystem, not a category.
Ref: NCERT Class 12 Biology Chapter 12: Ecosystem Ecosystem - Structure Components Stratification
Reptiles (except crocodiles) have a three-chambered heart with incomplete separation of ventricles.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Amphibia and Reptilia
Chondrichthyes, such as sharks and rays, have a cartilaginous endoskeleton.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Amphibia and Reptilia
All members of the class Pisces (fishes) are exclusively aquatic.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Amphibia and Reptilia
Vegetative reproduction in algae occurs by fragmentation, where each fragment develops into a thallus.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Plant Kingdom - Comparative Studies and Economic Importance
