Question

The flightless birds Rhea, Kiwi and Emu respectively belong to which countries?
A)South America, New Zealand and Australia
B)Africa, Australia and New Zealand
C)North America ,Japan and Africa
D)Australia, South Africa and Japan

Answer 1

Hint: Flightless birds are the birds which lost the ability to fly. For example Ostriches, Emu, Cassowaries, rheas kiwi etc. Even though they have wings they do not have the ability to fly.

Complete answer:
Flightless birds are evolved from birds that could fly. There is no acceptable scientific fact about how these birds lost their flight. There is a hypothesis about the evolution that the ancient birds living in colonies lacked predators so they do not need the escape mechanism, that is flight .This character is selected by nature and flightless birds are evolved as a result of this. But these birds which have lost the capacity of flight are attacked by human hunters. In order to escape from the enemy, these birds developed the character of quick running. So normally flightless birds are quick-runners. They are also bigger than the usual birds that can fly. Gigantism and flightless features are superficially correlated. Kiwi is the smallest flightless bird in the order of ratites.

Option A)South America, New Zealand and Australia
Rhea is a flightless bird native to South America. Kiwis are inhabitants of New Zealand .Emu is from Australia .They are adapted to the climatic conditions of respective continents and the availability of prey and lack of predators. Therefore this is the correct option
Option B) Africa, Australia and New Zealand
Rhea, Kiwi and Emu do not belong to Africa, Australia and New Zealand, because they do not have the adaptations suitable for the living of these organisms. Therefore this is an incorrect option.
Option C) North America, Japan and Africa
Rhea, Kiwi and Emu do not belong to North America ,Japan and Africa, because they do not have the adaptations suitable for the living of these organisms. Therefore this is an incorrect option.
Option D) Australia, South Africa and Japan
Rhea, Kiwi and Emu do not belong to Australia, South Africa and Japan, because they do not have the adaptations suitable for the living of these organisms. Therefore this is an incorrect option.

Hence, the correct answer is option (A)

Note: Most of the flightless birds belong to order ratites. Flightless birds are also developed as result of selective breeding. Inorder to produce more meat, these birds become heavy during breeding and their wings are unable to support their body during flight.