Flowering tundra plants must bloom and set seed quickly because

the summers are very short.

Explanation:

Tundra is a type of biome located in the northern hemisphere of the planet, in regions near the Arctic, more precisely in northern America, Europe and other places such as Alaska and Siberia. These regions tend to have very short summers, however summer weather conditions are extremely important for the reproductive process of these plants, so they must bloom and set seed quickly.

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explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.