Which specialized roots grow upward from the ground to obtain oxygen in swampy areas?

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Study for the Morphology of Flowering Plants Test. Enhance your understanding with multiple-choice questions, complete with explanations. Prepare for your exam!

Multiple Choice

Which specialized roots grow upward from the ground to obtain oxygen in swampy areas?

Explanation:
In waterlogged, oxygen-poor soils, plants must bring air to their roots. Pneumatophores are specialized aerial roots that grow upward from the root zone and reach above the substrate, often with many lenticels that allow atmospheric oxygen to diffuse into the roots. This direct oxygen access keeps the submerged root tissues alive in swampy environments, which is why pneumatophores are the correct choice. Stilt roots provide support and stability in loose substrates and aren’t primarily about respiration. Nodes and axillary buds are structural features of the stem, not involved in root gas exchange.

In waterlogged, oxygen-poor soils, plants must bring air to their roots. Pneumatophores are specialized aerial roots that grow upward from the root zone and reach above the substrate, often with many lenticels that allow atmospheric oxygen to diffuse into the roots. This direct oxygen access keeps the submerged root tissues alive in swampy environments, which is why pneumatophores are the correct choice. Stilt roots provide support and stability in loose substrates and aren’t primarily about respiration. Nodes and axillary buds are structural features of the stem, not involved in root gas exchange.

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