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GCSE Biology 2


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[Front]


The process by which plants convert carbon dioxide and water into glucose and oxygen using light energy.

[Back]


Photosynthesis

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GCSE Biology 2 - Detalles

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What do plants use photosynthesis for?
Plants use photosynthesis to make their food.
What do plants use carbon from carbon dioxide to make?
Carbohydrates Fats Oils Proteins (amino acids)
Why do plants use light energy?
To turn the reactants (carbon dioxide and water) into products (glucose and oxygen)
Where is chlorophyll found in plants?
Chlorophyll is found in chloroplasts in the leaves.
What do plants absorb light energy through?
A green pigment called chlorophyll
Where is chlorophyll found?
Chloroplasts in the leaf
Is photosynthesis an endothermic or exothermic reaction?
Photosynthesis is an endothermic reaction.
What is the primary use of the glucose produced in photosynthesis?
The glucose produced is used by the plant as food.
What is an endothermic reaction
A reaction that takes in energy from the surroundings
What happens to the oxygen produced during photosynthesis?
The oxygen produced is released into the environment.
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Photosynthesis Symbol Equation
What is oxygen produced by the plant used for?
It is not used It is released into the environment
Photosynthesis word equation
Carbon dioxide + Water + Light energy → Glucose + Oxygen
What is the primary function of photosynthetic organisms?
Photosynthetic organisms are the main producers of food and biomass on Earth.
Photosynthesis symbol equation
6CO2 + 6H2O + Light energy → C6H12O6 + 6O2
Where do photosynthetic organisms stand in food chains?
Photosynthetic organisms are the main producers of food in all food chains.
What is the role of photosynthetic organisms in the production of biomass?
They are the main producers of biomass (living material) on Earth.
What is biomass?
Living material
Who are the primary producers of biomass on earth?
Photosynthetic organisms (plants and algae)
What are the three main factors that can affect the rate of photosynthesis?
Light intensity Carbon dioxide concentration Temperature
What are the three main factors that can affect the rate of photosynthesis?
Light intensity Carbon dioxide concentration Temperature
How does light intensity influence the rate of photosynthesis?
Photosynthesis happens faster at higher light intensities because light provides the energy needed for the process.
Name three factors that can affect the rate of photosynthesis.
Light intensity, carbon dioxide concentration and temperature are the three factors that can affect the rate of photosynthesis
Why does an increase in carbon dioxide concentration in the air lead to a faster rate of photosynthesis?
Carbon dioxide is one of the raw materials needed for photosynthesis A higher concentration allows for faster conversion into glucose.
What is the relationship between temperature and the rate of photosynthesis?
The higher the temperature, the faster the rate of photosynthesis. At higher temperatures, reactant molecules have more energy, leading to more successful reactions.
How does light intensity impact the rate of photosynthesis?
Photosynthesis happens faster at higher light intensities because light provides the energy needed for the process.
What happens to the enzymes controlling photosynthesis at very high temperatures?
At very high temperatures, enzymes controlling photosynthesis are denatured (damaged), leading to the cessation of photosynthesis.
Why does an increase in carbon dioxide concentration enhance the rate of photosynthesis?
The higher the concentration of carbon dioxide, the faster the rate of photosynthesis, as carbon dioxide is a raw material needed for the process.
Define a limiting factor in the context of photosynthesis.
A limiting factor is a condition necessary for photosynthesis, and if it is in short supply, it can prevent photosynthesis from happening any faster.
How does temperature influence the rate of photosynthesis?
At higher temperatures, the rate of photosynthesis increases because reactant molecules have more energy, leading to more successful reactions. However, very high temperatures can denature enzymes, causing photosynthesis to stop.
Why is light the limiting factor at night for photosynthesis?
There is little light during the night, even if other conditions like carbon dioxide and chlorophyll are available.
How does increasing the light level affect the rate of photosynthesis?
Increasing the light level increases the rate of photosynthesis.
What is a limiting factor in photosynthesis?
A limiting factor is a condition that, if in short supply, prevents photosynthesis from happening any faster.
Can graphs of photosynthesis show more than one limiting factor at the same time?
Yes, several limiting factors can affect the rate of photosynthesis simultaneously.
Why is light the limiting factor at night for photosynthesis?
At night, there's little light, which makes it the limiting factor even if other conditions such as carbon dioxide and chlorophyll are present.
What does the levelling off of a photosynthesis graph indicate about a limiting factor?
When the graph levels off, it suggests that the factor that was initially limiting is no longer limiting.
What happens to the rate of photosynthesis when the light level is increased?
The rate of photosynthesis increases with an increase in light level.
How is the relationship between distance and light intensity described?
There is an inverse relationship between distance and light intensity.
What can photosynthesis graphs show?
Photosynthesis graphs can demonstrate the impact of multiple limiting factors on the rate of photosynthesis.
Can a graph show more than one limiting factor?
Yes, graphs can show the impact of multiple limiting factors on the rate of photosynthesis.
Describe the relationship between the rate of photosynthesis and light intensity.
The rate of photosynthesis is directly proportional to light intensity.
How is the rate of photosynthesis related to the distance from the light source?
The rate of photosynthesis is inversely proportional to the distance from the light source.
What is the initial limiting factor in the photosynthesis graph?
In the example given, carbon dioxide concentration is the initial limiting factor.
What does a constant rate on a photosynthesis graph suggest?
When the rate becomes constant, it signifies that the initial limiting factor, such as carbon dioxide concentration, is no longer limiting the rate.
In the example provided, what is the secondary limiting factor?
Temperature becomes a limiting factor after the rate levels off, leading to a further increase in the rate of photosynthesis when the temperature increased.
What is the relationship between light intensity and distance according to the inverse square law?
There is an inverse relationship between distance and light intensity; as distance increases, light intensity decreases.