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Roots obtain oxgyen from air soil for re...

Roots obtain oxgyen from air soil for respiration , In the absence or deficiency of `O_(2)` , root growth is restricted or completely stopped. How do the plants growing in marsh lands or swamps obtain their `O_(2)` required for root respiration ?

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The root of the plants (e.g. Rhizophora ) growth in marshy/swamp areas become negatively geotropic . They grow vertically upwards in air, above the soil level and respire so called respiratory roots or pneumatophores .
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