Read the following statements and choose the correct option: 1. During pregnancy the levels of other Hormones like estrogens, progestogens, cortisol, prolactin, thyroxine,etc., are increased several folds in the maternal blood. 2. Immediately after implantation, the inner cell mass differentiates into an outer layer called endoderm and an inner layer called ectoderm. 3. The inner cell mass contains certain cells call

Step-by-step solution

During pregnancy the levels of other Hormones like estrogens, progestogens, cortisol, prolactin, thyroxine,etc., are increased several folds in the maternal blood. Immediately after implantation, the inner cell mass differentiates into an outer layer called ectoderm and an inner layer called endoderm. The inner cell mass contains certain cells called stem cells which have the potency to give rise to all the tissues and organs. The human pregnancy lasts for 9 months.