10 public questions tagged with this topic.
Birds have hollow (pneumatic) bones, which reduce their body weight and aid in flight. 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 (Zoology section), Chapter: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
Both reptiles and birds lay amniotic eggs, which provide protection and a stable environment for the developing embryo. 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 (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Birds are the only vertebrates that possess feathers, which help in flight and insulation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Aschelminthes and Annelida
Birds have complete double circulation, meaning oxygenated and deoxygenated blood are fully separated.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Birds are homeothermic (warm-blooded), not poikilothermic (cold-blooded).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Attract females and deter rivals reflects key principle in quiz on behavior pyqs solved-section f, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Attract females and deter rivals 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 Attract females and deter rivals fits helps integrate natural selection, drift and species concepts essential for NEET, CSIR-NET and GATE exami
Ref: Alcock, Animal Behavior, Inclusive Fitness and Haplodiploidy.
