photosynthesis - need to know Flashcards
what does chlorophyll trap in photosynthesis
light energy for ATP production
what does the rate of photosynthesis mean?
how high the chlorophyll concentration is and how fast the plant is growing
what is a structural carbohydrate?
make- up the plant cell wall and are resistant to digestion
what is carbon fixation
occurs in stage 2, the ATP and hydrogen generated from the light reactions and carbon dioxide from the air combined they are converted into sugar during enzyme controlled reactions
describe the use of hydrogen in carbon fixation
the ATP is broken down to release energy which is used to combine hydrogen with carbon dioxide to produce sugar (glucose)
name a high energy molecule
ATP
explain why an increase in temperature can lead to an increase in rate of photosynthesis
low temperature enzymes move slowly, making the reaction occor slower but as temperature increases so does the rate of the reaction. Enzymes also become denatured at high temperatures.
state 3 limiting factors of photosynthesis
temperature
carbon dioxide concentration
light intensity
what is the function for carbon dioxide in photosynthesis
raw material for photosynthesis
what is the function for glucose in photosynthesis
respiratory substrate - used for energy for plant
what is the function for starch in photosynthesis
storage carbohydrate
state the location of photosynthesis
the chloroplast
what 3 products are found in stage 1
hydrogen, oxygen, ATP
what is stage 2 dependent on and why?
carbon fixation - so it can combine hydrogen and carbon dioxide to produce sugar (glucose) which gives the plant energy
what is the product of stage 2 and what is joined together to make it?
product = glucose
carbon dioxide, water and light
what are the 3 limiting factors and why does each one limit photosynthesis
light -at very high intensities photosynthesis is slowed
carbon dioxide - an increase in carbon dioxide will increase the rate of photosynthesis
temperature - at low temperatures the rate of photosynthesis is limited by the number of collisions between enzymes and substrate
what chemical could you test for the presence of starch in a leaf?
iodine solution
how could you measure the effect of light intesitivity on photosynthesis in a pondweed?
put boiling tube in a place so the pondweed is 10cm away from a light source (lamp) count number of bubbles rising up from the cut end of the stem in one minute and repeat steps for different distances
how is ATP formed
cellar respiration
the cell uses energy from food, including sugar, proteins, and fats, and connects a free phosphate molecule onto an ADP molecule, creating ATP
state 3 uses of the sugar in photosynthesis
used for energy
the sugar can be broken into plant cells to generate ATP
plant energy storage or plant building material
what diffuses what in photosynthesis?
oxygen diffuses from the leaves and carbon dioxide diffuses into them
what does cellulose mean?
sugar is converted to cellulose for structural uses e.g cell walls
what does limiting factor mean?
a factor or substance that prevents a chemical reaction from happening quicker
