What do '$P$','$Q$',and '$R$' represent in the given figure?

The diagram below shows a fertilised ovule and carpel. Which numbers represent the structures which will become:
$(i)$ The future embryo
$(ii)$ The future testa
$(iii)$ The future micropyle of the seeds
$(i), (ii), (iii)$ respectively?

The cylindrical portion below the level of cotyledons on the embryonal axis is known as:

The embryo develops from which of the following?

In grass embryos,the root cap is covered by which of the following?

What are the successive stages of embryogeny in a dicotyledonous plant?