Into how many classes are the angiosperms (flowering plants) classified?

The "Ordines Anomali" of Bentham and Hooker includes:

Which is the largest plant found in Australia?

Identify the incorrect pair from the following.

Which is the correct option for the angiosperm plants having the following characteristics?
$i.$ Name of the plant with size $2-5 \ mm$
$ii.$ Name of the tallest plant
$iii.$ Name of the plant with the heaviest and largest flower
$iv.$ Name of the plant with the tallest and largest inflorescence

Which of the following groups of plants exhibit pollination by wind,insects,and birds?