Trophoblast is the protective and nutritive layer of the blastocyst. (True/False)

Femto is a unit of time.(True // False)

Identify True/False statements, Correct each false statement to make it true: Spermatozoa get nutrition from Sertoli cells. (True/False)

Photon is not a material particle. (True/ false)

What is function of trophoblast of blastocyst?