Match the parts of ovule given in column I with parts of seed given in column II:

Step 1: The ovule develops into a seed after fertilization. Matching parts:
- (a) Egg: Fertilized by sperm to form the zygote, which develops into the embryo (4).
- (b) Nucellus: Nutritive tissue in the ovule, persists in some seeds as perisperm (3).
- (c) Outer integument: Forms the outer seed coat, testa (1).
- (d) Inner integument: Forms the inner seed coat, tegmen (2).
Step 2: Thus, the matches are: (a)-(4), (b)-(3), (c)-(1), (d)-(2).

Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.

Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in different stages of its development.
Which of these options is true in the context of the below diagram of pollen grain?
