2011 CFA exam - Question 1

Regarding objective 1

Please explain these points.

1 If shares are sold in either trusts today,i know in revocable becker pays the taxes and for irrevocable not becker but trust pays the taxes.Please explain am i right ?

2 If irrevocable trust is not subject to estate taxes upon becker’s death then even revocable will leave the same money in trust as MV= Basis upon death.

3 Please explain why revocable leaves with more money in trust?