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In mammals, there are four extra-embryonic membranes that develop from the trophoblast. These include the amnion, chorion, allantois, and yolk sac. The trophoblast forms the outer cellular layer of the morula.

1. Amnion, chorion, allantois, yolk sac
2. Amnion, chorion, yolk sac, placenta
3. Amnion, yolk sac, placenta, chorion
4. Chorion, yolk sac, placenta, allantois

Correct answer: Amnion, chorion, allantois, yolk sac

Solution

The four extra-embryonic membranes are amnion, chorion, allantois, and yolk sac. The placenta is not one of these membranes; it develops from embryonic and maternal tissues, so options including placenta are incorrect.

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