In a unilocular ovary with a single ovule,the placentation is

Pappus is a modification of:

Match the Column $I$ and Column $II$:

Column $I$	Column $II$
$(a)$ Apocarpous	$(i)$ Papaver
$(b)$ Syncarpous	$(ii)$ Michelia
$(c)$ Epiphyllous	$(iii)$ Cashew
$(d)$ Cotyledon	$(iv)$ Aloe

In which condition are the flowers always in a single whorl of perianth?

What type of placentation is seen in Argemone?

Which of the following is correct for the vexillary aestivation (papilionaceous)?
Standard (Vexillum) $\quad$ Wings (Alae) $\quad$ Keel (Carina)