Plants transport water, minerals, and sugars through two vascular tissues: xylem and phloem. These specialized systems allow water to reach the talles
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Why are xylem vessels larger in diameter than phloem sieve tubes?
Large diameter reduces resistance to water flow, allowing rapid transport of water needed in large quantities. Phloem moves dissolved sugars in smaller quantities requiring less transport speed, so smaller diameter is adequate.
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What happens to a plant if phloem is completely blocked?
The plant cannot transport sugars to roots. Roots starve and die. The plant dies because roots provide water and minerals, and without them, the above-ground parts cannot survive.
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How do trees in tropical rainforests, where it rains constantly, manage water transport?
High humidity reduces transpiration, so transpiration pull is weaker. Root pressure becomes more important. These plants often produce larger root systems to increase water uptake and maintain xylem sap pressure.
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