Biology B2 2.2 Limiting factors

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When do plants grow best?
When they have enough light, carbon dioxide and water, and are kept at a suitable temperature.
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What happens if the conditions for growing plants best (enough light, carbon dioxide and water, and are kept at a suitable temperature) are not met?
The rate of photosynthesis will be limited.
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How would lack of light affect a plant?
It would slow down the rate of photosynthesis as light provides the energy for the process. Even on sunny days light may be limited to plants which are shaded by trees.
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How can the cold affect plants?
If it is cold enzymes do not work effectively and this will slow down the rate of photosynthesis.
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How does too little carbon dioxide affect plants?
The rate of photosynthesis will slow down. Carbon dioxide may be limited in an enclosed space e.g. in a greenhouse on a sunny day where there is lots of light energy but the plants may run out of carbon dioxide.
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What is anything which puts a cap on the rate of photosynthesis called?
A limiting factor.
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When doing photosynthesis experiments, what do you need to know?
Which factor is being changed and which factors must be controlled. If you want to find out the effect of increasing carbon dioxide levels then you must be aware that other factors such as light may limit the rate of photosynthesis.
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In an experiment, what is the independent variable?
The one being tested e.g. concentration of carbon dioxide.
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In an experiment, what is the dependent variable?
The one you should measure, in this case it is usually the volume of oxygen produced.
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What are the variables which need to be controlled in a photosynthesis experiment?
Light, temperature and the type of plant being used.
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Why do enzyme reactions slow down?
When the temperature falls the enzymes work slower.
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What is meant by the term 'dependent variable'?
The variable that is being measured, the measurement depends on what is done with the independent variable.
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**TO GET THE BEST MARKS POSSIBLE MAKE SURE YOU CAN EXPLAIN WHY A FACTOR IS LIMITING**
**THE MOST DIFFICULT QUESTIONS INVOLVE INTERPRETATION OF GRAPHS, ALWAYS CHECK THE AXES OF THE GRAPH TO WORK OUT WHICH ARE THE INDEPENDENT AND DEPENDENT VARIABLES**
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**LOOK UP GRAPHS IN RELATION TO THE EFFECT OF FACTORS ON PHOTOSYNTHESIS**
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Other cards in this set

Card 2

Front

What happens if the conditions for growing plants best (enough light, carbon dioxide and water, and are kept at a suitable temperature) are not met?

Back

The rate of photosynthesis will be limited.

Card 3

Front

How would lack of light affect a plant?

Back

Preview of the front of card 3

Card 4

Front

How can the cold affect plants?

Back

Preview of the front of card 4

Card 5

Front

How does too little carbon dioxide affect plants?

Back

Preview of the front of card 5
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