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Transpiration data and quantitative skills

Organisation • Plant tissues, organs and systems

Key concepts

What you'll likely be quizzed about

  • Transpiration is the evaporation of water from mesophyll cells into leaf air spaces, followed by the diffusion of water vapour through stomata to the atmosphere.
  • This process lowers local water potential, causing water from xylem to move into mesophyll cells, maintaining a continuous transpiration stream upward through the plant.
  • Environmental changes alter the driving forces of transpiration: increased temperature raises evaporation and transpiration rates; increased wind removes humid air from leaf surfaces, enhancing transpiration; increased humidity decreases the vapour potential gradient, thus reducing transpiration.

Flashcards

Test your knowledge with interactive flashcards

State why units must appear in table headers rather than in table cells.

Click to reveal answer

Including units in headers prevents repetition, ensures column consistency, and minimizes transcription errors.

Key notes

Important points to keep in mind

Place the independent variable in the first table column and order it increasingly.

Include clear column headers with units; keep units consistent in each column.

Use a line graph for continuous variables and a bar graph for discrete categories.

Select axis scales that maximize grid usage with even intervals and labeled units.

Calculate rate as change ÷ time and include area for per-area rates.

Identify and justify anomalies before including or excluding them from trend lines.

Control temperature, humidity, light, and air flow during practicals to minimize confounding effects.

Report numerical values from graphs when comparing trends, always stating units.

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