respiration
photosynthesis
all organisms, including plants and algae, need food for respiration, growth and reproduction
during photosynthesis, plants produce glucose from simple inorganic molecules - carbon dioxide and water - using light energy
the word equation
carbon dioxide ( 6 CO2) + water ( 6 H20 ) --- Light ( chlorophyll) ---> Glucose ( C6 H12 06) + OXYGEN ( 6 O2)
during photosynthesis, energy is transferred from the environment to the chloroplasts by light.
this energy is then transferred to convert carbon dioxide (CO2). from the air, plus wate r( H20) from the soil to a simple sugar called glucose (C6 H12 06 )
Factors affecting photosynthesis
ways of measuring the rate of photosynthesis in the lab
the rate of oxygen output
the rate of carbon dioxide uptake
the rate of carbohydrate production
factors can affect the rate of photosynthesis:
click to edit
light intensity
carbon dioxide concentration
temperature
The amount of chlorophyll also affects the rate of photosynthesis:
plants in lighting conditions unfavourable for photosynthesis synthesise more chlorophyll, to absorb the light required
the effects of some plant diseases affect the amount of chlorophyll, and therefore the ability of a plant to photosynthesise
All organisms respire in order to release energy to fuel their living processes. The respiration can be aerobic, which uses glucose and oxygen, or anaerobic which uses only glucose.
Respiration releases energy – it is an exothermic process.
Respiration happens in cells.
to drive the chemical reactions needed to keep organisms alive – the reactions to build complex carbohydrates, proteins and lipids from the products of photosynthesis in plants, and the products of digestion in animals, require energy
movement – in animals, energy is needed to make muscles contract, while in plants, it is needed for transport of substances in the phloem