Difference between Ovule and Ovum

What is the difference between Ovule and Ovum?

Ovule as a noun is the structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments. while Ovum as a noun is the female gamete in animals; the egg cell.

We hope you now know whether to use Ovule or Ovum in your sentence.