Functional megaspore in an angiosperm develops into an?

Answer: In angiosperms or blooming trees, the megaspore parent cell generates a functioning megaspore that undergoes two distinct stages before developing into some kind of embryo sac. The 2 types of process are:

• Megasporogenesis, here megaspores turns into nucellus
• Megasporogenesis, here the megaspores turn into embryo sac.