more space is occupied when imported even without rows

Hi i have taken an export Dump of a full Database without rows option.

exp system/manager file=fulldb.dmp full=y grants=y rows=n

now i am trying to import objects of one user. The tablespaces are already created.

imp geneva_admin/geneva_admin file=fulldb.dmp fromuser=GENEVA_ADMIN touser=GENEVA_ADMIN rows=n grants=y ignore=y

But i can literally see the tablespace has grown up to around 2 GB but i can say the objects alone cannot occupy so much space.

what will be the problem?

create tablespace customer_tab_ts_1 datafile '/u02/oradata/GEN35C/custdat01.dbf' size 400M autoextend on default storage (
initial 256k
next 256k
pctincrease 0
);

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