Starting from the innermost part, the correct sequence of parts in an ovule is

1. egg, nucellus, embryosac, integument

2. egg, embryosac, nucellus, integument

3. embryosac, nucellus, integument, egg

4. egg, integument, embryo sac, nucellus

Starting from the innermost part, the correct sequence of parts in an ovule is egg, embryo sac, nucellus, integument. This sequence can be seen in following

Page 25, XII NCERT