Which one has two pairs of jaws?

Which arthropod has two pairs of appendages per abdominal segment?

the chest of ..... has two pairs of wings.

In the following options ,each one has a pair of names. They are the same hormone with different names. Which one of these does not follow the rule ?

In the following options ,each one has a pair of names. They are the same hormone with different names. Which one of these does not follow the rule ?

In which of the following, the central atoms has two lone pairs of electrons

In which of the following molecules, the central atom has two lone pairs of electrons ?

i) BeCl_2 , has no lone pair of electrons. ii) NH_3 has one lone pair of electrons. iii) H_2O has two lone pair of electrons. Which one is correct statement ?

In cockroach, which one is called accessory jaw

The shape of a molecule which has 3 bond pairs and one lone pair is