Geography, asked by chitragchitra9183, 1 year ago

What altitude do pine trees start growing in india?

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Answered by arpit281
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What is the highest altitude at which plants & trees can grow and what plants & trees grow at this altitude?

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Nate Bremmer, Living in simpler times

Answered Jan 12, 2013

The three main factors limiting life at high altitudes are pressure, temperature, and radiation. For flowering plants that require pollination, the altitude limit of the most tolerant bee, Bombus festivus, seems to be 5200m at 53kPa; this limits the species of flora at high altitudes. Given sufficient partial pressures of O2 and CO2 though, plants themselves have been shown to function at some ridiculously low pressures in artificial environments.

The highest known tolerance of life to UV radiation is about 5,000 J/m^2, recorded from studying the bacteria Deinococcus radiodurans. For plants, bryophytes (mosses) are tied for first with certain algae. Bryophytes in general do well because of high levels of phenolics (particularly flavonoids, which color them black), and the green alga Micrasterias denticulata in particular is known for UV resistance. 

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