Exploring Water's Unique Properties

Which of the following best describes the property of cohesion in water?

• The attraction between water molecules and other substances.

• The attraction between water molecules themselves.

• The ability of water to resist external force.

• The process of water forming droplets on a surface.

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TEKS.SCI.8.6C

DOK Level 1: Recall

Explain how cohesion contributes to the formation of water droplets on a leaf.

• Cohesion causes water molecules to spread out evenly across the leaf.

• Cohesion causes water molecules to stick to the leaf surface.

• Cohesion causes water molecules to stick together, forming droplets.

• Cohesion causes water molecules to evaporate quickly from the leaf.

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TEKS.SCI.8.6C

DOK Level 2: Skill/Concept

Describe how adhesion is important for the transport of water in plants.

• Adhesion allows water to evaporate from the leaves.

• Adhesion helps water molecules stick to the walls of plant vessels.

• Adhesion prevents water from moving upward in the plant.

• Adhesion causes water to form droplets on the plant surface.

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TEKS.SCI.8.6C

DOK Level 2: Skill/Concept

A water strider is able to walk on water due to which property of water?

• Cohesion

• Adhesion

• Surface tension

• Evaporation

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TEKS.SCI.8.6C

DOK Level 1: Recall

Analyze how surface tension allows insects to walk on water without sinking.

• Surface tension increases the density of water, supporting the insect.

• Surface tension creates a strong film on the water surface that supports the insect's weight.

• Surface tension decreases the water's viscosity, allowing the insect to glide.

• Surface tension causes water to evaporate, reducing the insect's weight.

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TEKS.SCI.8.6C

DOK Level 3: Strategic Thinking

What role does adhesion play in the process of water transport from roots to leaves in plants?

• Adhesion helps water molecules stick to each other.

• Adhesion helps water molecules stick to the plant's roots.

• Adhesion helps water molecules stick to the plant's vascular tissues.

• Adhesion helps water molecules evaporate from the leaves.

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TEKS.SCI.8.6C

DOK Level 2: Skill/Concept

Identify the phenomenon that occurs when water forms droplets on a waxy surface.

• Adhesion

• Cohesion

• Surface tension

• Capillary action

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TEKS.SCI.8.6C

DOK Level 1: Recall

Evaluate the impact of surface tension on the shape of water droplets.

• Surface tension causes droplets to flatten out.

• Surface tension causes droplets to form a spherical shape.

• Surface tension causes droplets to evaporate quickly.

• Surface tension causes droplets to merge into larger bodies of water.

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TEKS.SCI.8.6C

DOK Level 3: Strategic Thinking

Which of the following best explains why water can travel up narrow tubes against gravity?

• Cohesion between water molecules.

• Adhesion between water molecules and the tube walls.

• Surface tension at the top of the water column.

• Evaporation of water at the top of the tube.

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TEKS.SCI.8.6C

DOK Level 2: Skill/Concept

Predict how a decrease in surface tension would affect the ability of insects to walk on water.

• Insects would be able to walk more easily on water.

• Insects would sink into the water.

• Insects would be unaffected by the change in surface tension.

• Insects would be able to jump higher on the water surface.

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TEKS.SCI.8.6C

DOK Level 3: Strategic Thinking