What do the ovule and ovary develop into after fertilization?

Examine the figure given below and select the right option identifying all the four parts $a, b, c$ and $d$.

Which of the following plants has an endospermic seed?

Non-albuminous seed is produced in

Why is vivipary an undesirable trait in annual crop plants?

In castor, the proliferation of the outer integumentary cells at the micropylar region forms a structure known as the caruncle. What is the primary function of this structure?