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Morphology of Flowering Plants
Question
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Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of O2, root growth is restricted or completely stopped. How do the plants growing in marshlands or swamps obtain their O2 required for root respiration?

Answer

Plants found in the marshlands have root modifications called Pneumatophores which are negatively geotropic that is they come out of the ground and grow vertically upwards to take up oxygen from the atmosphere. 

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Some More Questions From Morphology of Flowering Plants Chapter

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