In which one of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?

Consider the following: 1. Bats 2. Bears 3. Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?

Which one of the following organs is the main respiratory organ of whale?

Which one of the following has a bilateral symmetry in its body organization?

Which one of the following is a filter feeder?

Among the following organisms, which one does not belong to the class of other three?