Why in high altitudes do we have smaller plants than in low altitudes?

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Amaregouda Patil

At higher altitudes UV rays concentration will be high.UV radiation destroy the auxins content at the apical shoots.Hence plants are small or bushy at high altitudes.

Abohassan Farhang Sardrodi

ok, thanks for your answer, but dear Amaregouda;

why distance between internode is higher in down altitude than high altitude, but the number of node is fixed.