The number of chambers in the heart of a cockroach is .....?

Explain the digestive system of cockroach with the help of a labelled sketch.

How many of the following structures are associated with excretion in a cockroach? Kidney,Malpighian tubules,Fat bodies,Uricose glands,Nephrocytes,Antennae glands.

What does '$a$' represent in the given figure?

If the head of a cockroach is removed,it may live for a few days because:

The primary excretory product in a cockroach is .....