B.8 Photosynthesis Flashcards
(16 cards)
When chloroplast absorb light what energy transfer happen?
Energy is transferred from the environment to the chloroplast
What type of reaction is photosyntheis
endothermic - energy is transferred from the environment
Word equation for photosyntheis
carbon dioxide+ water — (light energy) —- glucose + oxygen
symbol equation
6CO2 + 6H2O —(light energy)— C6H12O6 + 6CO2
why is photosynthesis done
to form ‘food’ in form of glucose
How do plants use glucose (accronym)
Cellulose
Respiration
Oils/fats
Protein (amino acids)
Starch
How is glucose used for respiration
Used for respiration to release energy
How is starch used
- Glucose converted to starch for storage
- Starch is compact and insoluble
- Doesn’t cause cell to gain or lose water by osmosis
How is cellulose used
- Strengths cell walls
how is oil and fats used
- used as energy storage in seeds
How is glucose used for proteins
- Glucose + nitrate ions = amino acids
- amino acids used to sythensis proteins
- nitrate ions must be absorbed through roots
- low nitrate have stunted growth
what effect the rate of photosythisis
- temp
- carbon dioxide
- light intensity
- amount of chlorophyll
what do light intensity and CO2 conc graphs look like
- straight line when light and CO2 are the limiting factor
- flat line until another factor becomes limiting
what does a temp graph look like
- a sad quadratic
- as temp rise, kinetic energy rise
- until optimum temp
- higher temp the enzymes denature, active site of the enzyme changes shape and is no longer complimentary
what is the inverse proportion law
light intensity = 1/d^2
How do greenhouse control the rate of photosynthesis
- limiting factors can be controlled
- Increase rate of photosynthesis
- More profit
