Bioenergetics Flashcards
What is photosynthesis?
Photosynthesis is a chemical reaction which takes place in
plants.
What is the equation for photosynthesis?
Carbon dioxide + Water –> Glucose + Oxygen.
What absorbs light?
Chlorophyll.
Is photosynthesis and endothermic or exothermic reaction?
Endothermic.
Where does photosynthesis take place?
In the chloroplasts.
What are chloroplasts?
Small organelles found in plant cells.
What is a limiting factor?
Something which stops the photosynthesis reaction from occurring at a faster rate.
How do plants aqquire carbon dioxide?
Via diffusion through the stomata of their leaves.
What is glucose made in photosynthesis used for?
Respiration.
What are the 3 limiting factors?
Temperature, light intensity and carbon dioxide.
What will increasing the temperature of the surroundings do?
Increase the rate of reaction.
What will increasing light intensity and carbon dioxide levels do?
They will increase the rate of the reaction.
What was the independent variable in the effect of light intensity on photosynthesis RP?
The light intensity.
What was the dependent variable in the effect of light intensity on photosynthesis RP?
The amount of bubbles produced.
What was the control variable in the effect of light intensity on photosynthesis RP?
Keeping the same amount of time/ same amount of pondweed.
When is light intensity a limiting factor usually?
At night.
When is temperature a limiting factor?
In winter.
What is respiration?
The chemical reaction which occurs inside the mitochondria of all living cells to release energy for living functions and processes.
Is respiration endothermic or exothermic?
Respiration is an exothermic reaction.
Describe anaerobic respiration.
In anaerobic respiration, the glucose is not completely oxidised, so there is less energy released than in aerobic respiration.
What produces lactic acid?
When oxidation of glucose is incomplete.
What can built up lactic acid result in?
Oxygen debt.
What is metabolism?
The combination of all the reactions in a cell or in the body.
How is lactic acid transported?
Via the bloodstream to the liver.
