Question

Longest gestation period is that of
(a)Human being
(b)Camel
(c)Rhino
(d)Salamandra atra

Answer 1

This is a species of amphibian. It is found in the Palearctic and individuals can grow to 150 mm. They have sexual reproduction. Reproduction is dioecious. They are usually black or brown where males are slightly more pronounced cloaca than females.

Complete answer:
Salamandra atra , give birth to live offspring that develop in the posterior portion of the oviducts. The young one develops and undergoes metamorphosis in each oviduct during a 4-year gestation. Gestation is shorter in S. salamandra, which gives birth to larval salamanders. The large size of those offspring indicates that considerable nutrient contributions are made by the mother during these prolonged gestation periods.

Additional Information: -Gestation is the interval between fertilization of an egg and therefore the birth of the young. It begins at fertilization and ends with parturition.
-Gestation lengths vary in different species.
-Gestation costs about 3% of the daily energy requirement during the primary 3 months and 20% during the last 2 months.
-The minor alterations which persist throughout life, like the increased size of the mammary glands, enlargement of the uterus, and of the entire of the genital canal, aren't generally obvious except after repeated breeding, and in from 4 to 6 weeks the dam has returned to normal to all intents and purposes, always expecting the flow of milk in the mammary glands.
-There are three stages or trimesters of pregnancy in the bitch.
-The first stage begins with fertilization and ends when the embryos implant in the uterus, the second stage begins at implantation and ends when the fetuses undergo ossification.
-Many factors affect conception rates and gestation in livestock.
-Most of those factors may contribute to early pregnancy failure, including factors intrinsic to the conceptus, factors intrinsic to the dam, extrinsic factors, and combinations of all of those factors causing conception and gestation problems.
-The gestation may be a period of development and there's an endless process of tissue differentiation, organogenesis, and maturation.
-The process is complex, and important periods of development occur at different times within the different species. Agents causing embryonic loss are therefore highly variable.
So, the correct answer is, ‘ Salamandra atra.’

Note: -Elephants have the longest gestation of all mammals. These gentle giants' pregnancies last for quite a year and a half.
-The average gestation of an elephant is approximately 640 to 660 days or roughly 95 weeks. By comparison, a person's pregnancy lasts a mean of 280 days or 40 weeks.