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Question
Which of the following group of organisms bear young ones with short development period inside the mother and complete their development in a pouch outside mother's body?
Which of the following group of organisms bear young ones with short development period inside the mother and complete their development in a pouch outside mother's body?
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Solution
The correct option is A Marsupials
Marsupials carry their underdeveloped young ones in an abdominal pouch for some time after birth as young ones spend shorter period inside mother as compared to placental mammals. The presence of fluid-filled sac (amnion) around the embryo during its development is the key feature of amniotes. Placental mammals have long gestation period and produce comparatively developed young ones. Monotremes are egg-laying mammals and prokaryotes are the unicellular organisms without any defined nucleus. Thus, the correct answer is option A.
Marsupials carry their underdeveloped young ones in an abdominal pouch for some time after birth as young ones spend shorter period inside mother as compared to placental mammals. The presence of fluid-filled sac (amnion) around the embryo during its development is the key feature of amniotes. Placental mammals have long gestation period and produce comparatively developed young ones. Monotremes are egg-laying mammals and prokaryotes are the unicellular organisms without any defined nucleus. Thus, the correct answer is option A.
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