Step 1: Definition.
Apomixis is a form of asexual reproduction that mimics sexual reproduction, where seeds are formed without fertilization.
Step 2: Characteristics.
\[\begin{array}{rl} \bullet & \text{Seeds are produced without the union of gametes.} \\ \bullet & \text{Offspring are genetically identical to the parent (clones).} \\ \bullet & \text{Helps maintain hybrid vigour for several generations.} \\ \end{array}\]
Step 3: Examples.
\[\begin{array}{rl} \bullet & \text{Citrus, Mango, Grass species.} \\ \end{array}\]
Step 4: Importance.
Apomixis is important in plant breeding because it helps fix desirable traits and maintain superior hybrids.

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?
