Found inside – Page 914Fertilization may be internal or external . ( a ) External fertilization . It takes place in two ways , ( i ) Gametes fuse outside the female body . Found inside – Page 102... and Review Organisms have many different mating and reproductive strategies to ensure that fertilization occurs . ... External fertilization Internal fertilization Fertilization is the fusion of an egg and sperm cell to form a diploid zygote ; it ... Found inside – Page 206syngamy takes place in external medium of water (external fertilization). ➢ Large number of gametes are released into the external medium. Found inside – Page 194an unusual courtship dance - takes place , in which the pair circle around each other and constantly change colour . It is possible that internal fertilization takes place , for steche records that an isolated female with only one mate will continue ... Found inside – Page 69The anterior rays of the anal fin of males are modified into an intromittent organ , called a " gonopodium ” , for directing spermatozoa to the female's vent where internal fertilization takes place . Identification of the sexes in mature fish is easy . Found insideIn the evolution of terrestrial from aquatic vertebrate life , a transition from external to internal fertilization takes place . External fertilization is not adapted to terrestrial conditions , hence in the land living vertebrates it occurs only in some of the ... Found inside – Page 37With the exception of British Columbia ' s Tailed Toad , which possesses a tail - like copulatory organ for internal fertilization , fertilization takes place externally in frogs and toads . The males retain their hold on the female until she has laid her ... Found inside – Page 136The differences between external and internal fertilization are as follows: S. No. ... (ii) Internal fertilization takes place in terrestrial animals. Found inside – Page 153Table 11.3 : Differences between external and internal fertilization External ... External fertilization in amphibians Mating takes place in water . Found inside – Page 8The transfer of gametes take place through different medium like water, air, etc. ... occur within or outside the maternal body: External fertilization and ... Found inside – Page 206syngamy takes place in external medium of water (external fertilization). ... Internal fertilization is common in organisms living in terrestrial habitat ... Found inside – Page 426known, however, that in some hermaphroditic nemerteans, as the freshwater Prostoma, self-fertilization takes place ... Carcinonemertes and Prosorhochmus which are normally oviparous, with internal fertilization, a few of the fertilized ova may ... Found inside – Page 85In humans, the development of fertilized egg takes place in the : (NCERT Exemplar) (a) Ovary (b) Testis (c) ... (c) Viviparous with internal fertilisation. Found inside – Page 84Animals maybe fertilized internally or externally . Internal fertilization takes place inside the body of a mother animal . Found inside – Page 164Dry foods can be taken from the surface or as it falls , but it is difficult for them to pick it up at the bottom due to the ... in some species internal or indirect fertilization takes place before spawning , the females depositing fertile eggs without the ... Found inside – Page 5As in the case of external fertilization, mucins also occur in the ejaculates of internal fertilizers, whose function is to increase fertilization ... Found inside – Page 170Here the fertilization occurs during or just after amplexus . In the crayfishes ... EXTERNAL FERTILIZATION WITHOUT AMPLEXUS The eggs and spermatozoa are deposited freely in the water to come together by chance . 2. EXTERNAL ... Found inside – Page 85Choose the set that has an incorrect combination. ... (c) Viviparous with internal fertilisation. takes place in the : (NCERT Exemplar) (a) Ovary (b) Testis ... Found inside – Page 206syngamy takes place in external medium of water (external fertilization). ... Internal fertilization is common in organisms living in terrestrial habitat ... Found inside – Page 206syngamy takes place in external medium of water (external fertilization). ... Internal fertilization is common in organisms living in terrestrial habitat ... Found inside – Page 174In viviparous teleosts fertilization takes place within the ovary , or sometimes within the follicle , and several mechanisms serve to transmit nutrients to the growing embryos . 8 . 2 ELASMOBRANCHS All living elasmobranchs have internal ... Found inside – Page 69... Q26, Pg51) Ans. Hens are oviparous in which internal fertilisation takes place which in frogs oviparous, external fertilisation takes place. Found inside – Page 126Spermatocytes break off from the testis external fertilization takes place . ... were known for many aquatic species with into spermatids while floating as cell clusters in the internal fertilization : oligochaetes ( Annelida ) ( see coelomic fluid . Found inside – Page 121Such fertilization that takes place inside the body is called internal fertilization. Examples, humans, cows, dogs, and hens. test tube Babies Some women ... A strength of Concepts of Biology is that instructors can customize the book, adapting it to the approach that works best in their classroom. Found insideInternal fertilization takes place in invertebrates such as annelids, some arthropods, and some mollusks, and in vertebrates such as reptiles, birds, ... Found inside – Page 36... i . e . , species with internal fertilization and internal incubation of the embryos , are common in Chondrichthyes , but in teleosts they are restricted to eight families of Cyprinodontiformes and Perciformes . Embryogenesis can take place within ... Found inside – Page 210Respiration may occur through the gills, lungs which never become very efficient in modern amphibians, skin, ... Internal fertilization occurs in two viviparous species, Salamandra atra (urodelan) and Nectophrynoides occidentalis, the Guinea ... Found inside – Page 169In most species , the union of sex cells takes place in the water . ... Some sperm come in contact with some of the eggs , and fertilization takes place . This process is called ... For internal fertilization to occur , males and females must mate . Found inside – Page 8The transfer of gametes take place through different medium like water, air, etc. ... occur within or outside the maternal body: External fertilization and ... Found inside – Page 153In such cases the major part of embryonic development takes place outside the female body , even though fertilization has been internal . Found inside – Page 37... water where fertilization takes place . Starting from this point of view it is not possible to consider any group of the Turbellaria , e.g. , the Acoela , as the direct source of higher animal groups . In connection with internal fertilization the Acoela ... Found inside – Page 688known , however , that in some hermaphroditic nemerteans , as the freshwater Prostoma , self - fertilization takes place ... Carcinonemertes and Prosorhochmus which are normally oviparous , with internal fertilization , a few of the fertilized ova ... 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