Where does fertilization take place in frogs?

Where are the copulatory pads in male frog present?

Crop in cockroach is used to grind the ingested food. True or false?

Respiratory exchange in earthworms takes place through __

Which of the following statements is false about cockroaches?

Which of these statements is true about nerve ring?

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

In which of the following segments are the blood glands of an earthworm present?