Photosynthesis Flashcards
(21 cards)
What is the overall process of photosynthesis?
Photosynthesis uses energy to change carbon dioxide and water into glucose and oxygen.
Where does photosynthesis take place?
In chloroplasts in green plant cells.
What pigments are involved in photosynthesis?
Chlorophyll.
What type of reaction is photosynthesis?
Endothermic.
How is energy transferred to chloroplasts?
By light.
What is the word equation for photosynthesis?
Carbon dioxide + water → glucose + oxygen.
What is the symbol equation for photosynthesis?
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
How do plants use glucose?
Plants use glucose in five main ways:
* Respiration
* Making cellulose
* Making amino acids
* Stored as oils or fats
* Stored as starch.
What is the role of glucose in making amino acids?
Glucose is combined with nitrate ions absorbed from the soil to make amino acids, which are then made into proteins.
Why is starch a better storage form than glucose?
Starch is insoluble, which prevents a cell from drawing in excess water and swelling up.
What three factors affect the rate of photosynthesis?
Intensity of light, concentration of CO₂, and temperature.
What does it mean when a factor is described as a limiting factor?
It means that the factor is stopping photosynthesis from happening any faster.
What can be a limiting factor at night?
Light.
What can be a limiting factor in winter?
Temperature.
How can chlorophyll be a limiting factor in photosynthesis?
The amount of chlorophyll can be affected by disease or environmental stress, reducing the rate of photosynthesis.
What is one example of a disease that can affect chlorophyll production?
Tobacco mosaic virus.
light.
What can oxygen production show in the pondweed experiment?
The rate of photosynthesis
State the pondweed experiment(6)
A source of white light is placed at aa specific distance from the pondweed
Pondweed is left to photosynthesise for a certain amount of time
As this happens the oxygen released will collect in a capillary tube.
At the end the syringe is used to draw the gas bubble in the tube alongside a ruler and the length of the gaass bubble is measured. This produced is proportional to the volume of o² produced.
Experiment is repeated twice with light source at different distances and mean volume o² Is calculated
The whole experiment is repeated either the light source at different distances from the pondweed
What can pondweed be used for?
To measure the effect of light intensity on the rate of photosynthesis.
What is the put
