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Why are large air spaces present in aerenchyma?

Ncert solutions for Class 11th Biology Lab Manual Chapter 4 Exercise 4 Question 1


In order to provide buoyancy to the plants & to allow the circulation of gases large air spaces are present in aerenchyma.

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The channles of air filled cavities provide a low-resistence internal pathway for the exchange of gases such as oxygen and ethylene between the plant above the water and the submerged tissues.

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