Which of these is not a division of thorax in a cockroach?

In the brain of frogs, optic lobes are present in the ___

How many chambers are present in the heart of a cockroach?

In frog, the ventricle opens into __

Which of the following segments is not involved in the formation of a genital pouch in male cockroaches?

How many ommatidia are present in the compound eyes of the cockroach?

Which of the following is not a part of the excretory system of frogs?

Which of these characteristics is true about the vascular system of cockroach?