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Placoid scales are found in...

Placoid scales are found in

A

Cartilaginous fishes/sharks/chondri-chthyes

B

Bony fishes/osteichthyes

C

Lung fished

D

All the above

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The correct Answer is:
A
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Which types of scales are found in chondrichthyes and osteichthyes?

Which type of scales are found on the skin of cartilaginous fishes ?

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Count the number of statements which are not related to the members of class chondrichthyes:- (a) terminal mouth (b) placoid scales on skin (c) presence of air bladder (d) poikilothermal (e) internal fertilization (f) vivipary

What are not true? a. Dermal scales of fishes form the exoskeleton b. cycloid and ctenoid scales have distinct lines of growth which aid in determining the age of the fish. c. Fish scales are never shed. d. The skin in elasmobranchs is covered with placoid scales. e. The development of a placoid sale is not like the development of a tooth

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",):}

Which of the following characters are seen in sharks ? (i) Body is streamlined and mouth is terminal . (ii) Gill slits are not covered by operculum . (iii) Skin is tough ,containig minute placoid scales . (iv) many of them are oviparous .

Which of the following statement are not true about shark? a. The skin is tough and covered with placoid scales. b. They possess a swim bladder which regulates buoyancy. c. the tail of shark is heterocercal. d. Ampulla of lorenzini present in the snout of shark is thermoreceptor. e. it has five pairs of gill slits covered by operculum.