B8 Flashcards
describe how a leaf is adapted to carry out photosynthesis
a leaf is broad and flat to take in as much sunlight as possible. palisade cells contain lots of chloroplasts to carry out as much photosynthesis as possible. there are small holes in the leaf to allow gases to diffuse in and out of the cell.
what is required for photosynthesis to take place
CO2, water, sunlight and chlorophyll
name the different tissues of the leaf starting from the top and going down
upper epidermis, palisade mesophyll, spongy mesophyll, lower epidermis
describe what photosynthesis is
photosynthesis is an endothermic chemical reaction in which light energy is used to turn carbon dioxide and water are used to make glucose and oxygen and in doing so energy is made.
what is the symbol equation of photosynthesis
6CO2 + 6H20 —> C6H1206 + 6O2
how to test for starch in a leaf
Heat a plant leaf in boiling water for 30 seconds
Heat it in boiling ethanol for a few minutes
Wash with water and spread onto a white tile
Add iodine solution from a dropping pipette
what are some of the uses of glucose
make starch for storage, make lipids, used for storage, used for respiration
what is the inverse square law
light intensity = 1 divided by distance squared
I = 1 divided by d squared
what are the steps to the rate of photosynthesis practical
https://www.youtube.com/watch?v=id0aO_OdFwA
what factors can affect the rate of photosynthesis
carbon dioxide, water, light intensity, lack of chlorophyll
how does the diagram for temperature affecting the rate of photosynthesis differ from the diagrams of light and carbon dioxide levels affecting the rate of photosynthesis
there’s an optimum temperature at which enzymes work at so the difference is that the graph will increase then start to decrease at around 39 degrees Celsius whilst the other 2 graphs increase then stay become a HORIZONTAL LINE.
what are some of the uses of glucose in plants
creating cellulose which is used to make cell walls
creating starch which is used for storing energy
creating fats and oils which is also used for creating energy stores
creating proteins used in making cytoplasm and cell membranes
why is glucose converted into starch and other fats and oils to be stored rather than storing glucose itself
as starch and the other fats and oils are insoluble so they cannot affect the water concentrations inside of cells and cannot be moved away by water in the storage areas
why is glucose converted into starch and other fats and oils to be stored rather than storing glucose itself
as starch and the other fats and oils are insoluble so they cannot affect the water concentrations inside of cells and cannot be moved away by water in the storage areas
how can farmers increase the yield of crops in greenhouse
they can use artificial lighting for when its cloud or its raining, they also can use extra heating to make the optimum temperature for enzymes to work and they can also increase the amount CO2 there is in the air in a greenhouse.
