Question Detail

This sequence is incorrect. The correct developmental sequence is: Zygote -> Cleavage (produces blastomeres) -> Morula (solid ball of cells) -> Blastula (hollow ball with blastocoel) -> Gastrula. None of the options are fully correct. Option C has blastula before morula, which is wrong. Perhaps the question has a typo and meant to start with zygote. Given the options, C is the least incorrect if we ignore the starting point, as it at least lists the key stages in some order. This is a poorly constructed question.