Photosynthesis Flashcards
Photosynthesis uses what type of energy and green pigment to create energy?
Light energy and chlorophyll
In a plant where does this reaction take place?
Chloroplasts
What type of reaction is photosynthesis and why?
Endothermic because it uses light from its surroundings
How do the plants get carbon dioxide and water?
Carbon dioxide: stomata in the leaves via diffusion
Water: absorbed from the soil by their roots and transported to the cells carrying out photosynthesis via the xylem
What’s the word equation for photosynthesis?
Carbon dioxide + water —> glucose + oxygen
What’s the balanced symbol equation for photosynthesis?
6CO2 + 6H2O —> C6H12O6 + 6O2
Why do plants carry out photosynthesis?
To make glucose which is used in respiration (which releases energy)
What’s a limiting factor and how does it affect the rate of photosynthesis?
Something which stops/ slows down the rate of photosynthesis. For example, if you have loads of carbon dioxide in a plant but only half the water then photosynthesis will happen far slower because there’s only a certain amount of water that can be used which will leave carbon dioxide left over.
Name examples of limiting factors.
Light intensity, temperature and carbon dioxide concentration.
How will increasing Light intensity and carbon dioxide concentration affect the rate of reaction?
If there’s more intense light then there is more energy to carry out reactions. If there’s a higher carbon dioxide concentration there are more reactants available so rate of reaction increases.
How will and increase in temperature affect the rate of reaction?
Increasing temperature of surroundings will increase the rate of reaction up to 45 degrees Celsius. After this enzymes that catalyse the reaction (make it happen) become denatured.
How is glucose made by photosynthesis stored and used?
Stored as starch, fats or oils and is used to produce cellulose and amino acids which are used in protein synthesis.
