SQL & PL/SQL :: Insufficient Privileges When Creating Tables Using Execute Immediate?

SQL> connect sys as sysdba
Enter password:
Connected.
SQL> grant dba to temp;

Grant succeeded.

SQL> connect temp
Enter password:
Connected.
SQL>
SQL> create or replace procedure tempproc
2 is
3 begin
4 execute immediate 'create table temp_table(a varchar2(10))';
5 end;
6 /

Procedure created.

SQL> exec tempproc;
BEGIN tempproc; END;

*
ERROR at line 1:
ORA-01031: insufficient privileges
ORA-06512: at "TEMP.TEMPPROC", line 4
ORA-06512: at line 1

SQL>
SQL> declare
2 begin
3 execute immediate 'create table temp_table(a varchar2(10))';
4 end;
5 /

PL/SQL procedure successfully completed.

SQL> desc temp_table;
Name Null? Type
----------------------------------------- -------- ----------------------------
A VARCHAR2(10)

Why am I not able to create a table from procedure using execute immediate?