SQL & PL/SQL :: Obtain Result Set When Doing Select

when in sqlplus I execute:

select * from mytable;

in sqlplus I get the returned rows of this table. But this is not the case when I do in plsql the following:

create or replace procedure myproc is

a varchar2(50);
begin
a := 'select * from mytable';
execute immediate a;
end;

there is nothing I can see. Is there a way to catch this result set and see it on the screen? Something that is not creating new structures like cursors, etc?