Answer :
Part 1:
Yes, embryos have leaves which are known as cotyledons.
Plants with two embryonic leaves are termed dicotyledonous ("dicots") .
Plants with one leave are known as monocotyledon.
Part 2:
Six (6) Chromosomes.
As embryo is formed from the combination of egg and sperm. If embryo has 12 chromosomes then sperm will have half means 6 chromosomes.
Part 3:
Six (6) Chromosomes.
As embryo is formed from the combination of egg and sperm. If embryo has 12 chromosomes then egg of a bean or corn will have half means 6 chromosomes.