Q: 268 (SSC/NA)
question_subject:
Science
question_exam:
SSC
stats:
0,4,10,5,5,4,0
keywords:
{'allantois': [1, 0, 0, 0], 'embiyo': [1, 0, 0, 0], 'digestion': [3, 0, 1, 3], 'excretion': [1, 0, 0, 0], 'respiration': [2, 0, 1, 3]}
The correct answer is option 3, excretion. The allantois is a membranous sac found in the embryos of reptiles, birds, and mammals. It primarily functions as a storage organ for waste products produced by the embryo. As the embryo develops, metabolic waste such as nitrogenous compounds (e.g., uric acid) accumulate in the bloodstream. The allantois acts as a temporary storage site for these waste products and facilitates their removal from the developing embryo. Ultimately, the waste is eliminated through the allantois in reptiles and birds or through the umbilical cord in mammals. Therefore, the allantois is essential for the excretory processes during embryonic development.