Biology A-Level
Control of environmental variables
What Control of environmental variables means in Biology A-Level, as defined for OCR.
Definition of Control of environmental variables
Check what you remember
Read the wording for your board, then hide it and explain Control of environmental variables in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Light intensity, temperature, humidity and air movement all affect stomatal behaviour, so only one should be varied while others are held constant.
Topics that use Control of environmental variables
- Transport in plants (OCR A-Level)
Related terms
- Cohesion and adhesion
- Hydrophyte
- Osmosis
- Potometer
- Rate calculation
- Source-to-sink transport of assimilates
- Surface area to volume ratio in plants
- Thin sections
Using Control of environmental variables in the exam
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