Chondrichthyes

Match the following {:(A.,"Amphibia",(i),"Air bladder",),(B.,"Mammals",(ii),"Cartilaginous notochord",),(C.,"Chondrichthyes",(iii),"Mammary glands",),(D.,"Osteichthyes",(iv),"Pneumatic bones",),(E.,"Cyclostomata",(v),"Dual habitat",),(F.,"aves",(vi),"Sucking and circular mouth with out jaws".,):}

Read the following matches about chordates and it's characteristics. I. Petromyzon - belongs to cyclostomata and are endoparasites on some fishes. II. Scoliodon - a Chondrichthyes in which teeth are modified placoid scales. III. Hippocampus - a cartilaginous aquarium fish known as a sea horse. IV. lchthyophis is a limbless viviparous amphibian with direct development. Select the incorrect statements ?

Which of the following characteristic features always holds true for the corresponding group of animals {:("(a)","Cartilaginous endoskeleton",,"Chondrichthyes"),("(b)","Viviparous",,"Mammalia"),("(c)","Possess a mouth with an upper and a lower jaw",,"Chordata"),("(d)","3- chambered heart with one incompletely divided ventricle",,"Reptilia"):}

Select the corect combinations is respect of characterstics of cartilaginous and bony fishes . {:("Character","Chondrichthyes","Osteichthyes"),((i)"Habitat","Freshwater","Marine"),((ii)"Scales","Placoid scales","Cyloid/Ctenoid"), ((iii)"Mouth","Suking mouth","Ventral mouth"),((iv)"Gills","4 pairs","5-7 pairs"):}

Which one of the following groups of animals is correctly matched with its one characteristic feature without even a single exception (a) Mammalia : Give birth to young ones . (b) Reptilia : Possess three - chambered heart with one incompletely divided ventricle (c) Chordata: Possess a mouth provided with an upper and a lower jaw (d) Chondrichthyes : Possess cartilaginous endoskeleton

Which of the following represents the correct combination without any exception {:(,"Characteristics","Class",),((a),"Mouth ventrcal, gills without operculum, skin with placoid scales, persistent notochord","Chondrichthyes",),((b),"Sucking and circular mouth, jaws absent, integument without scales, paired appendages","Cyclostomata",),((c),"Body covered with feather, skin mosit and glandular, fore-limbs form wings, lungs from wings, lungs with air sacs","Aves",),((d),"Mammary gland, hair on body, pinnae, two pair of limbs","Mammalia",):}

Select the correct option in respect of characteristics of each group. {:("Cyclostomes","Chondrichthyes","Osteichthyes"),((i)"Suking mouth","Ventral mouth","Terminal mouth "),((ii)"Scales absent","Placoid scales","Cycloid/Ctenoid scales"),((iii)"Marine","Marine","Marine adn freshwater"),((iv)6-15"pairs of gills",5-7 "pairs of gills without operculum",4 "pairs of gills with operculum"):}

Read the following statements and choose the correct option (i) Aves are homothermous (ii) Pinnae are present in mammals (iii) Operculum is present in chondrichthyes (iv) Skin of amphibians is dry and horny . (v) Open type of circulation is found in cyclostomes

Choose the correct statements : I. Cartilaginous fish swims continously due to the presence of an air bladder. II. Osteichthyes have four pairs of gills that are covered by an operculum. III. The notochord is persistent throughout life in Chondrichthyes. IV. Teeth of cartilaginous fishes are modified placoid scales.