39 public questions tagged with this topic.
Flame cells function as the excretory organs in Platyhelminthes, playing a role in osmoregulation and waste removal.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Regulation of Kidney Function - RAAS ADH ANF
Pneumatic (hollow) bones in birds reduce body weight, enhancing flight efficiency (NCERT, Chapter 4, page 58). Birds have a four-chambered heart, scaly skin is in reptiles, and mammary glands are in mammals.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Aves and Mammalia
Pristis (Sawfish) belongs to class Chondrichthyes and has a cartilaginous skeleton.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Birds have hollow (pneumatic) bones, which reduce their body weight and aid in flight.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Petromyzon (lamprey) is a jawless fish belonging to class Cyclostomata.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
All chordates possess a dorsal hollow nerve cord at some stage in their life cycle.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Cyclostomata and Pisces
Deuterostomes exhibit radial and indeterminate cleavage, and their blastopore develops into the anus. Protostomes show spiral and determinate cleavage.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Balanoglossus belongs to phylum Hemichordata, a group of marine worm-like animals.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Cephalochordates, such as Branchiostoma, exhibit indirect development with a larval stage.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
In urochordates, the notochord is present only in the larval stage, not throughout life.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Hemichordates have a body divided into three regions: proboscis, collar, and trunk.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Hemichordata and Chordata - Protochordata
Arthropods are characterized by jointed appendages, which provide mobility and functionality.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
