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

The $Triticum$ $aestivum$ wheat is:

Study the following statements.
$I$. Pollen grains of many species cause severe allergies and bronchial afflictions in some people,often leading to chronic respiratory disorders.
$II$. Pollen grains are rich in nutrients.
$III$. Carrot grass came into India as a contaminant with imported wheat.

Long silky hairs on the cob of maize are:

What is a $Pollen-embryo$?

Match the entries in Column-$I$ with those of Column-$II$ and choose the correct answer.

Column-$I$	Column-$II$
$A$. Cleistogamy	$m$. Insect pollination
$B$. Geitonogamy	$n$. Bud pollination
$C$. Entomophily	$o$. Pollination between flowers in the same plant
$D$. Xenogamy	$p$. Wind pollination
	$q$. Cross pollination