catfishes, are forked. Caudal fin aspect ratios are around 1.5 for largemouth ba
ID: 189028 • Letter: C
Question
catfishes, are forked. Caudal fin aspect ratios are around 1.5 for largemouth bass and 2.0 for brorn ol a. Anguilliform b. Subcarangiform c. Carangiform 11. Many fishes have dorsal fins that extend the length of the back and can swim by sending undulating fter the bowfin. waves along that fin to propel the body forward or backward depending on the direction of the waves This swimming mode is called fin, and it can move either f he fin in an appropriate direction (i.e., front to back for forward movenvent a The bowfin often swims by unduiating its dorsal or backwards using this technique by pass undulation along to front for d movement). Other examples include the Gy mnarchidac (African knifefishes) and some of its relatives in Mormyridac (elephantishes); these are electric fishes that commonly maintain a straight posture except when swimming rapidly a. Amiiform b. Balistiform C. iform e. Tetraodontiform 12 develop in dermis but project through epidermis to reach the surface. O to that of a vertebrate tooth with a pulp cavity, dentine, and enamel. Pulp cavity central cavity blood vessels, nerves, and connective tissue. Dentine layer - hard calcareous tissue than bone) that forms major portion of the scale, layer. Enamel layer- hard, glossy calcareous covering a. Cosmoid b. Cycloid c. Ctenoicd d. Ganoicd surrounds the pulp cavity, and is situated beneath enamel on outer surface of scale. e. Placoid 13. The kerati nized protuberances depicted in the illustration, (A) snout of fish (river chub Nocomis [Cyprinidae) and (B) "bump" at surface of fish epidermis, are a. mucous glands b. breeding tubercles c. chromatophores (cells) d. modified placoid scalesExplanation / Answer
11) The answer is AMIIFORM.
Bowfins swim by undulating its dorsal fin by moving it in either forward or backward direction.
This mode of swimming is called as AMIIFORM after BOWFIN (generic name- AMIA CLAVA) who is the ONLY EXTANT species of the order AMIIFORMES.
12) The answer is PLACOID SCALES.
PLACOID SCALES grow out of dermis and are also called Dermal Denticles.
Its structure includes three layers.
> The innermost layer is made up of blood vessels, nerves and connective tissue- similar to the pulpal cavity of a vertebrate tooth.
> Covering this pulpal layer is the hard calcareous layer, similar to tooth dentin, also secreted by odontoblastic cells.
> The outermost layer is made up of Vitrodentine,secreted by Ectoderm, which is similar to harder Enamel layer of a vertebrate tooth.
13) The answer is BREEDING TUBERCLE.
During reproduction phase, the males of RIVER CHUB (NOCHOMIS) of the family CYPRINIDAE develops a conical bump or a cap of purpulish hue, which are TESTOSTERONE induced, functioning to maintain body contact between the male and the female to ensure the flow of genetic material to the next generation.
They are also called NUPITAL TUBERCLE or HORNYHEAD.
They can be non-keratinized or keratinzed.
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