Advantage and disadvantages of viviparous and oviparous animals
Answers
Oviparous reproduction is the process of laying unfertilized eggs in an external environment. Such reproduction is shown by many species of snakes, lizards, etc.
In contrast, viviparous reproduction is the process of giving birth to young ones. It is mostly seen in mammals.
As it is evident, viviparous reproduction evolved from oviparous reproduction and, as we can oourselves see, has served man quite well. So the question that arises is why do some animals still reproduce oviparously?Well, since they do so there must be some advantage to it.
Traditionally viviparous reproduction has been considered inherently superior to oviparous reproduction which is somewhat bias towards mammals and fails to consider the biological significance reproductive diversity. A more sophisticated approach would be to call them reproductive ‘strategies’ both of which have their own advantages and disadvantages. Some advantages of oviparous reproduction over viviparous are :
In viviparous reproduction, during pregnancy, the feeding and locomotion of the mother is affected which subsequently effects maternal and offspring survival. There is no such risk in oviparous fertilization.Space constrains limit litter size more in viviparous forms than in the oviparous relatives because the wet mass and volume of neonates (new born mamals) exceeds that of the ovulated yolk.Furthermore, pregnancy may prevent a female from starting the next litter of offspring which effects the net reproductive output. This does not happen in oviparous reproduction.
ADVANTAGES AND Disadvantages of viviporus
Advantage- in this, young one develop inside body of female and so gets better nourishment,proper development and better chances of survival.
Disadvantage- the maturation period is long nd the offspring produced are comparatively very less.
Oviparous reproduction is the process of laying unfertilized eggs in an external environment. Such reproduction is shown by many species of snakes, lizards, etc.
In contrast, viviparous reproduction is the process of giving birth to young ones. It is mostly seen in mammals.
As it is evident, viviparous reproduction evolved from oviparous reproduction and, as we can oourselves see, has served man quite well. So the question that arises is why do some animals still reproduce oviparously?Well, since they do so there must be some advantage to it.
Traditionally viviparous reproduction has been considered inherently superior to oviparous reproduction which is somewhat bias towards mammals and fails to consider the biological significance reproductive diversity. A more sophisticated approach would be to call them reproductive ‘strategies’ both of which have their own advantages and disadvantages. Some advantages of oviparous reproduction over viviparous are :
In viviparous reproduction, during pregnancy, the feeding and locomotion of the mother is affected which subsequently effects maternal and offspring survival. There is no such risk in oviparous fertilization.
Space constrains limit litter size more in viviparous forms than in the oviparous relatives because the wet mass and volume of neonates (new born mamals) exceeds that of the ovulated yolk.
Furthermore, pregnancy may prevent a female from starting the next litter of offspring which effects the net reproductive output. This does not happen in oviparous reproduction.