Question

"The graph given below shows the distribution of biomes:
  
(a) What do the ‘X’ and ‘Y’ axis represent?  (b) Identify the ‘grassland’ and ‘coniferous forest’ biomes, from the above figure. (c) Why is ‘F’ located at the given position in the graph?       "

Answer 1

(a) ‘X’ axis - Mean annual precipitation (cm)                                             

     ‘Y’ axis - Mean annual temperature (0C)

(b)Grassland - B                   

                      Grassland is an area in which the vegetation is dominated by a nearly continuous cover of grasses. Grasslands occur in environments conducive to the growth of this plant cover but not to that of taller plants, particularly trees and shrubs. The factors preventing establishment of such taller, woody vegetation are varied                                   

  Coniferous forest - E

                                Coniferous forest are forest in which vegetation composed primarily of cone-bearing needle-leaved or scale-leaved evergreen trees, found in areas that have long winters and moderate to high annual precipitation. The northern Eurasian coniferous forest is called the taiga, or the boreal forest. Both terms are used to describe the entire circumpolar coniferous forest with its many lakes, and rivers. Coniferous forests also cover mountains in many parts of the world. Pines, spruces, firs, and larches are the dominant trees in coniferous forests.

(c)  The mean annual temperature ranges from -12 to 20C (error accepted ± 2) and mean annual precipitation ranges from 10 - 125 cm, these are the optimum conditions in tundra biome .