- Each biome has unique characteristics in terms of organisms, weather, nutrient flow and stores.
(a) The model shows world biomes in relation to mean annual precipitation and mean annual temperature.
(i) State the mean annual temperature range in deserts. [1]
(ii) State the mean annual precipitation range in tropical rainforests. [1]
(b) The Gersmehl diagrams show the inter‑relationships between nutrient flows and stores in desert and tropical rainforest.
Gersmehl diagrams for desert and tropical rainforest showing nutrient stores X, Y, Z
Deduce with a reason the nutrient store labelled Z. [1]