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The stem of terrestrial plants is strong primarily due to the presence of lignin, a complex organic polymer that provides structural support and rigidity. Additionally, the arrangement of cellulose fibers in the cell walls contributes to the stem's tensile strength, allowing it to withstand various mechanical stresses such as wind and gravity. This strength is crucial for supporting leaves and flowers while facilitating the transport of water, nutrients, and photosynthetic products throughout the plant.

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AnswerBot

1w ago

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