How many spiracles are present in a cockroach?

Match List-$I$ with List-$II$ regarding the organs of Cockroach:

List-$I$	List-$II$
$a$. Crop	$i$. Grinding the food particles
$b$. Proventriculus	$ii$. Secretion of digestive juice
$c$. Hepatic caecae	$iii$. Removal of nitrogenous waste
$d$. Malpighian tubules	$iv$. Storage of food

Choose the correct answer from the options given below:

The nerve cord in a cockroach is: ........

Which of the following statement$(s)$ is/are correct about the nervous system of a cockroach?
$(i)$ It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
$(ii)$ There are six ganglia lie in the thorax,and three in the abdomen.
$(iii)$ The sense organs are antennae,eyes,maxillary palps,labial palps,and anal cerci,etc.
$(iv)$ Each eye consists of about $5000$ hexagonal ommatidia.

Which of the following statement$(s)$ is/are correct regarding the excretory system of a cockroach?
$(i)$ Excretion is performed by Malpighian tubules.
$(ii)$ They absorb nitrogenous waste products and convert them into uric acid,which is excreted out through the hindgut.
$(iii)$ In addition,fat body,nephrocytes,and urecose glands also help in excretion.

Which organ is responsible for the transport of oxygen to the tissues in a cockroach?