The process used by producers to make their own food via a series of chemical reactions.

A measure of how much change occurs per unit of time.

A condition that when in short supply slows down or limits the rate of photosynthesis.

A biological catalyst that speeds up a chemical reaction without itself being used up.

The conditions where maximum rate of reaction occurs.

Factors affecting the rate of photosynthesis

Combined science

The effect of light intensity on rate of photosynthesis in pondweed: plan

The effect of light intensity on rate of photosynthesis in pondweed: practical

The effect of light intensity on rate of photosynthesis in pondweed: evaluation

Light intensity and the inverse square law

Photosynthesis and limiting factors

Pupils learned about ways in which the human body maintains a constant internal environment in response to internal and external change, including changes in temperature and water balance.

This unit explores factors affecting photosynthesis rates and focuses on planning and conducting experiments. It includes selecting techniques, accurate measurements, data analysis, and evaluating methods to improve reliability and suggest further investigations.

Photosynthesis: factors affecting the rate

a measure of how much change occurs per unit of time

the amount of light reaching a given surface area in a period of time

an idea, for example an idea about an outcome of an experiment, based on observations and understanding

a factor that can be changed during an experiment

a factor that is kept the same during an experiment

a measurement result is considered accurate if it is judged to be close to the true value

an error leads to measurements being different to what they would otherwise be (the true value)

the spread of results around the mean value

measurements are similar when repeated by the same person or group using the same equipment and method

similar results are obtained when an investigation is repeated by another person or group using different equipment

oscillations/ripples in electric and magnetic fields

variables are inversely proportional when one increases and the other decreases at the same (proportional) rate, e.g. as one variable doubles, the other variable halves

light intensity is inversely proportional to the square of the distance from the light source

A condition that, when in short supply, slows down or limits the rate of photosynthesis.

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Photosynthesis: factors affecting the rate

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