Melniple Choice flunctions in most fishes are combined in one system dae to the
ID: 203395 • Letter: M
Question
Melniple Choice flunctions in most fishes are combined in one system dae to the common location of a number of organs and dacts c muscular e mone of the above 7. The gonads of-_ lac k sperm ductsvloviducts; therefore, sperm/eggs are shed into the body cavity and environment by passing through one/two abdominal pores. d. ancestral ray-finned fishes e derived ny-finned fises Ma fish species are-- a oviparous h ovoviviparous e viviparous d all of the above 9, Most fish species reproduce by a. external fertilization h intemal fertilization d hybridogenesis e. all of the above 10. Most female have paired oviducts that are continuous wi the covering of the ovaries. a. hagfishes b. lampreys d. osteichthyans e all of the above I1. Non-guarders (reproductive guild) are characterized by external fertilization, high fecundity, no protection of eggsyoung, and high mortality of offspring. Non-guarder fishes include a. open-substrate pelagic spawners (c.g, tunas [Scombridae], freshwater drum [Sciaenidae]) b. open-substrate benthic spawners (c.g,pikes [Esocidae], gars [Lepisosteidae]) cbrood hiders (eg, saimon [Salmonidae], many North American minnows [Cyprinidae]) d all of the above 12. Faculative intermnal bearers include a few species of oviparous cyprinodontiform fishes, in which some eggs retained by female are accidentally fertilized (internally) by the normal process of spawning on a substrate. This form of pseudo-internal fertilization is considered a a first step in the evolution of live birth seen in the family Poeciliidae (livebearers) b. an evolutionary "dead end" that occurred within the family Fundulidae (topminnows) c. an adaptation to harsh environs (e-g, high temperatures, low oxygen levels) in species within the familyExplanation / Answer
Answer 6: d) urinary
7. a) hagfish and lampreys
8. a) oviparous
9 a) external fertilization
10. c) chondricthyans
11. d) all of above
12. a) a first step in evolution of live births seen in family poecilidae