The colleterial glands in a cockroach help in .....

In cockroaches,at the junction of $............$ and $............$,about $............$ yellow-colored,thin,thread-like Malpighian tubules are present.

Blood does not transport oxygen in

The heart of a cockroach is ...... .

Give scientific reasons: In cockroach,a well-developed respiratory system is seen.

Which of the following statements is correct regarding the cockroach?