Ans. (c) Amazon is a rain forest that covers most of the Amazon basin of South America and territory including nine nations. It represents over half of the planet's rain forests and exhibits the largest and the most diversified tropical rainforest.

It is home to more than 40000 species of plants, 3000 of fishes, 1300 birds, mammals, amphibians, reptiles, and more than 125000 invertebrates. Amazon rainforest is popularly called the lungs of the planet earth' because its vegetation continuously recycles carbon dioxide into oxygen.

Taiga forest, present in the broad belt of the Northern hemisphere, represents the largest terrestrial biome.

Tundra forest is a biome where tree growth is hindered by low temperatures and short growing season. Rain forests of North- East India are tropical forests with a natural reservoir of genetic diversity.