• How do plants survive the cold?
  Plants have evolved many different ways of surviving mountain ...

• Why do different plants grow on different sides of a mountain?
  Different sides of a mountain have different climates. On the south ...

• How do mountain herbivores find their food?
  Many mountain mammals burrow under the snow and continue to feed on ...

• Which is the driest desert?
  In parts of the Sahara the average yearly rainfall is less than I mm, ...

• Why are alpine flowers so popular in gardens?
  Many mountain plants, such as gentians and saxifrages, are known as ...

• How do grassland fires start in nature?
  Fires sometimes rage in grasslands, especially in the dry summer ...

• What is the tree-line?
  Trees cannot grow all the way up a mountain, and the highest level ...

• Which garden flowers come from natural grasslands?
  From the grasslands of Europe and Asia come flowers such as adonis, ...

• How do some mountain plants reproduce without flowers?
  Many mountain plants have dispensed with flowers because of the lack ...

• What happens to all the leaves that fall?
  Huge quantities of leaves fall each season from forest trees, but ...