Consider tracheary elements with annular thickening (annular secondary walls) and those with pitted walls. Which is weaker?

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Consider tracheary elements with annular thickening (annular secondary walls) and those with pitted walls. Which is weaker? Which has a large percentage of its primary wall free of secondary wall and available for water movement? Is one always more selectively advantageous than the other? Under all conditions? Explain.

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