Which of the following statements about mammals is incorrect?
Some mammals, such as whales and dolphins, lack external ears (pinnae).
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Phylum Ctenophora and Platyhelminthes
Practice questions covering Phylum Ctenophora and Platyhelminthes, including their key features and classification. Designed for biology exam preparation.
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Which of the following statements about cartilaginous fishes is incorrect?
Cartilaginous fishes lack a swim bladder, which is present in bony fishes for buoyancy control.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which characteristic is unique to phylum Ctenophora?
Ctenophores, also known as comb jellies, use comb plates for locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which feature is unique to phylum Ctenophora?
Bioluminescence, the ability to emit light, is a characteristic feature of Ctenophores.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which feature is a characteristic of phylum Ctenophora?
Ctenophores, or comb jellies, are characterized by the presence of eight comb plates that aid in locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which of the following animals possesses flame cells for excretion?
Planaria (a platyhelminth) uses flame cells for osmoregulation and excretion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which of the following is a distinguishing characteristic of reptiles?
Reptiles have dry, cornified skin covered with epidermal scales or scutes, adapted for terrestrial life.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which type of fertilization occurs in reptiles?
Reptiles exhibit internal fertilization, where fertilization occurs inside the female’s body before laying eggs.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which excretory structure is present in Platyhelminthes?
Platyhelminthes use flame cells for excretion and osmoregulation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which phylum does the animal 'Pleurobrachia' belong to?
Pleurobrachia is a ctenophore, characterized by the presence of comb plates used for locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which of the following is a characteristic feature of mammals?
Mammals are characterized by the presence of hair or fur, which provides insulation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which phylum consists of animals with a segmented body and nephridia for excretion?
Annelids have a segmented body and use nephridia for excretion and osmoregulation.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes