2
Question
The following changes in human embryo development show in which period?
(i) The embryonic disc and amniotic cavity develop.
(ii) The mesoderm is spreading between ectoderm and endoderm.
The following changes in human embryo development show in which period?
(i) The embryonic disc and amniotic cavity develop.
(ii) The mesoderm is spreading between ectoderm and endoderm.
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Solution
The correct option is B Second week
During second week of pregnancy, trophoblast develops. It is the outer layer of cells that provide nutrients to the embryo and form part of the placenta. During this week, embryonic disc is formed as the floor of the amniotic cavity. Amniotic cavity is also developed during this week. It contains the amniotic fluid that cushions and protects the fetus. Also, at this week, the yolk sac is vascularized and contributes nutrients to the embryo. The embryonic sinusoids and extraembryonic coelom are also developed. Thus, the correct answer is 'Second week.'
During second week of pregnancy, trophoblast develops. It is the outer layer of cells that provide nutrients to the embryo and form part of the placenta. During this week, embryonic disc is formed as the floor of the amniotic cavity. Amniotic cavity is also developed during this week. It contains the amniotic fluid that cushions and protects the fetus. Also, at this week, the yolk sac is vascularized and contributes nutrients to the embryo. The embryonic sinusoids and extraembryonic coelom are also developed.
Thus, the correct answer is 'Second week.'
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