Which of the following statements is true? 1. Cohesion helps plants transport water from roots to leaves. 2. Water's dissolving power is crucial for nutrient transport in blood. 3. Water's solid form is less dense than its liquid form, which is why ice floats. 4. Surface tension measures the attraction between water molecules and other materials.
Biology · Middle School · Mon Jan 18 2021
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The true statement among the options provided is:
- Cohesion helps plants transport water from roots to leaves.
Cohesion refers to the attractive force between molecules of the same substance. In the context of plants, cohesion between water molecules allows them to stick together, forming a continuous column of water within the plant's vascular system (xylem). This cohesion, combined with adhesion (the attraction between water molecules and the xylem walls), creates a phenomenon called capillarity or capillary action. This capillary action, driven by cohesion and adhesion, helps in the movement of water upwards from the roots to the leaves against gravity, facilitating the transport of water and nutrients throughout the plant.