Consider the transport of ovum, fertilisation and passage of growing embryo through Fallopian tube (standard NCERT diagram). Choose the incorrect statement. (1) The second meiotic division of secondary oocyte occurs after fertilisation. (2) The embryo with 8–16 blastomeres is called morula. (3) The trophoblast layer of blastocyst gets embedded in the endometrium. (4) The cells of inner cell mass differentiate to form embryo as well as extra-embryonic membranes.