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Q. Fish identity card. How are fishes characterized according to examples of representing beings, skin, basic morphology, circulation, nitrogen waste, respiration, thermal control and types of reproduction?
Examples of representing beings: tuna, sardines, sharks, rays, salmons. Basic morphology: hydrodynamic body, fins cartilaginous skeleton in chondrichthyes, bony skeleton in osteichthyes. Skin: with scales in placoid and osteichthyes scales in chondrichthyes. Respiration: branchial, Circulation: incomplete, closed, heart with two chambers. Nitrogen waste: urea in chondrichthyes, ammonia in osteichthyes. Thermal control: heterothermic. Kind of reproduction: sexual, internal fecundation in chondrichthyes, external in osteichthyes.
Wheel organ of amphioxus.
Phylum Ciliophora 1) They have cilia at some stage in the life-cycle. The cilia are used for locomotion or creating a feeding current. 2) They feed heterotrophically usually
Q What are the two major classes into which fishes are divided? Ans. Fishes are divided into two major classes: osteichthyes, bony fishes (tuna, sardines, salmons) , and chondr
feeding habit of branchiostoma?
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