Which of the following is the correct statement about the circulatory system of a cockroach?

Which of the following does not participate in excretion in cockroach?

In cockroach,the number of ganglia are

Which of the following statement$(s)$ is/are correct regarding the digestive system of cockroach?
$(i)$ Mouth opens into a short tubular pharynx,leading to a narrow tubular passage called oesophagus.
$(ii)$ Gizzard helps in grinding the food particles.
$(iii)$ $A$ ring of $6-8$ blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut,which secrete digestive juice.
$(iv)$ At the junction of midgut and hindgut is present another ring of $100-150$ yellow coloured thin filamentous Malpighian tubules which help in removal of excretory products from haemolymph.

Name the blood vessel that arises from the first chamber of the heart in a cockroach.

The blood of a cockroach does not contain any respiratory pigment. This means that .........