Which of the following flowers only once in its life-time?

After anther culture,some diploid plants are observed along with haploid plants. Which of the following parts induces the origin of the diploid plants?

In angiosperms,microsporogenesis and megasporogenesis

Which of the following statements are true?
$P = \text{Papaver}$ has a multicarpellary syncarpous pistil.
$Q = \text{Endothecium}$ provides nourishment to the Microspore Mother Cell.
$R = \text{Commelina}$ has chasmogamous and cleistogamous flowers.

Identify the odd one out.

Statement $P$: Seeds of some plants like orchids do not contain stored food.
Statement $Q$: The embryo present in their seeds is extracted and grown in a culture medium.