What is cryopreservation?

Read the following statements regarding gynoecium in angiosperms.
$i$. Embryo sac is located towards the micropylar end of the ovule.
$ii$. Placenta is present inside the ovary locules.
$iii$. Stigma serves as the receptive organ for pollen grains.
$iv$. Cells of the nucellus are haploid with abundant food.
$v$. Ovules generally have more haploid cells than diploid cells.
Identify the correct set of statements from the following.

In which plant was the pollen tube discovered by $G.B.M.C.$?

External fertilization is mostly observed in organisms that.....

Which of the following statements is $NOT$ correct?

The cell that undergoes meiosis is called: