B4 Flashcards
What is photosynthesis?
Chemical reaction which takes place in plants. It converters carbon dioxide and water into glucose and oxygen.
What type of reaction is photosynthesis?
Endothermic
Where does the plant get the energy for photosynthesis to occur?
Light
How does the plant acquire the carbon dioxide for photosynthesis?
Via diffusion through the stomata of the leaves
What are the limiting factors of photosynthesis?
- temperature
- light
- intensity
- carbon dioxide
What effect will increasing the temperature of surroundings have on photosynthesis?
Increasing the temperature of the surroundings will increase the rate of reaction, but only up to around 45°C. At this temperature the enzymes will catalyse and the enzyme will denature.
What will be the effect of increasing the light intensity on photosynthesis?
It will increase the rate of reaction because there is more energy to carry out more reactions 
What will be the effect of increasing the carbon dioxide concentration on photosynthesis?
It will increase the rate of reaction because there are more reactants available 
How does using a greenhouse help with photosynthesis? 
It traps the suns radiation as heat inside the greenhouse, so that the temperature is not a limiting factor for the rate of photosynthesis 
What does the inverse square law state?
The intensity of light is inversely proportional to the square distance from the source 
What is the equation for light intensity?
Light intensity is proportional to 1/distanance^2
What is respiration?
The chemical reaction which occurs inside the mitochondria of all living cells to release energy for living functions and processes e.g. movement 
What type of reaction is respiration? 
Exothermic reaction, meaning the energy is released to the surroundings 
Is respiration, aerobic or anaerobic 
Can be either
When does anaerobic respiration occur when a person exercises? 
If the muscles are not receiving enough oxygen to keep up the demand needed by respiration reactions, then anaerobic respiration begins to occur. This incomplete oxidation of the glucose produces lactic acid which converted in the muscles and result in an oxygen debt. 
