Malpighian tubules remove excretory products from:

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.

The respiratory pigment in a cockroach is:

The body cavity of a cockroach is also called:

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

The blood of a cockroach contains no respiratory pigment. This means that: