viviparity वाक्य
उदाहरण वाक्य
मोबाइल
- Adenotrophic viviparity differs from ovoviviparity in that the eggs ( usually one at a time ) are retained within the female's body, hatch and are nourished through " milk glands " until the developed larvae are ready to pupate.
- The degree of viviparity varies; some species simply retain the eggs until just before hatching, others provide maternal nourishment to supplement the yolk, and yet others lack any yolk and provide all nutrients via a structure similar to the mammalian placenta.
- There is no one mode of reproduction that is universally superior in selective terms, but in many circumstances viviparity of various forms offers good protection from parasites and predators and permits flexibility in dealing with problems of reliability and economy in adverse circumstances.
- Lizards from high elevation sites ( greater than ) in north-eastern New South Wales are viviparous, while low-elevation populations from northern and southern in New South Wales exhibit short-period oviparity, an intermediate between viviparity and typical oviparious behaviors.
- "' Matrotrophy "'is a form of maternal care during animal development, associated with live birth ( viviparity ), in which the embryo of an animal or flowering plant is supplied with additional nutrition from the mother ( e . g . through a placenta ).
- Especially since fishes which [ independently ] evolved viviparity do not revert to egg-laying, suggesting that it " is " advantageous in some way ( with the exception of some elasmobranchs which might have reverted, probably because their eggs are very well-protected anyway ).
- BTW, OP has this anything to do with " Polycotylus " ? : P Interestingly, that one seems to be a common thing shared by large pelagic air-breathers-extinct archosaurians, ichthyosaurs, mosasaurs, and plesiosaurs ( mammals can perhaps be discounted as viviparity is the default ).
- The traditional modes of reproduction include oviparity, taken to be the ancestral condition, traditionally where either unfertilised oocytes or fertilised eggs are spawned, and viviparity traditionally including any mechanism where young are born live, or where the development of the young is supported by either parent in or on any part of their body.
- Thorson's rule states that benthic marine invertebrates at low latitudes tend to produce large numbers of eggs developing to pelagic ( often planktotrophic [ plankton-feeding ] ) and widely dispersing larvae, whereas at high latitudes such organisms tend to produce fewer and larger lecithotrophic ( yolk-feeding ) eggs and larger offspring, often by viviparity or ovoviviparity, which are often brooded.
- His revised modes are ovuliparity, with external fertilisation; oviparity, with internal fertilisation of large eggs containing a substantial nutritive yolk; ovo-viviparity, that is oviparity where the zygotes are retained for a time in a parent's body, but without any sort of feeding by the parent; histotrophic viviparity, where the zygotes develop in the female's oviducts, but are fed on other tissues; and hemotrophic viviparity, where the developing embryos are fed by the mother, often through a placenta.
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