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Transpiration—Classic Lab Kits for AP® Biology

By: The Flinn Staff

In the Transpiration Classic Lab Kits for Classic AP® Biology, test the rate of transpiration in plants using a student constructed potometer. Refill is available.

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Students test the rate of transpiration in plants using a student constructed potometer. By inserting live bean seedlings into the potometer, students will easily observe the rate of water used by the plant’s vascular system. The students will learn the role that transpiration plays in the process of water movement. The optimal conditions for transpiration and photosynthesis are determined. Transpiration, water potential and guttation are discussed in the thorough background section.

Materials: Clear plastic tubing (" i.d.), Peat pellets, Planting tray, 1-mL Serological pipets, 10-mL Syringes, Plastic bags (12" x 22", 4 oz.), Red bean seeds, Petroleum jelly*

*Denotes items included with refill kit

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking

Disciplinary Core Ideas

HS-LS1.A: Structure and Function
HS-LS1.C: Organization for Matter and Energy Flow in Organisms
HS-LS2.B: Cycle of Matter and Energy Transfer in Ecosystems

Crosscutting Concepts

Cause and effect
Energy and matter
Stability and change

Performance Expectations

HS-LS1-1. Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins, which carry out the essential functions of life through systems of specialized cells.
HS-LS1-2. Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.
HS-LS1-3. Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.
HS-LS2-3. Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.