Vegetative propagation is a form of asexual reproduction in plants where new individuals grow from vegetative parts like roots, stems, or leaves rather than seeds. This method ensures rapid growth and identical offspring. It occurs naturally in plants like potatoes (tubers), onions (bulbs), and strawberries (runners). Artificial methods like grafting and layering are also used in horticulture.
Example: A potato tuber contains buds (eyes) that sprout into new plants. Similarly, Bryophyllum reproduces through leaf buds. 

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?
