Photosyjnthesis

Question 1

what happens during photosynthesis

Answer 1

energy is tranferred from the outisde to chloroplasts by light and then it converts the carbon from the air and the water from the soil into glucose for food and oxygen to breathe out

Question 2

whats an endothermic reaction

Answer 2

it takes in the imput of the outside for a product to be made

Question 3

where does the glucose go

Answer 3

it is either used as fuel for respiration or stored as starch

Question 4

photosynthesis number equation

Answer 4

6CO2 + 6H20 = C6H12O6 + 6O2

Question 5

HOW ARE LEAVES adapted for photosynthesis

Answer 5

large so big SA
thin so diffusion is easy
chlorophyll absorbs light
waxy layer is see through so light can pass to the palaside layer
the viens brings water from the xylm and removed the products of photosynthesis in the phloem
guard cells open and close the stomata

Question 6

what do plants need for photosynthesis

Answer 6

light
warmth
co2

Question 7

how does light intesnity affact

Answer 7

its obvs very proportional, more light = more photosynthesis. graph shows it increases and then flattens as it cant be too fast- another factor becomes the limiting one

Question 8

how does temp affect

Answer 8

temp rising increases photosynthesis but the enzymes that control photosynthesis will denature at about 45c

Question 9

how does chlorophyll affact

Answer 9

clorophyll is needed for the absirbation of light so if its gone plants will grow much slower. it needs minerals to make chlorophyll

Question 10

explain required practical photosynthesis

Answer 10

place a boiling tube 10cm away from an led loght, LED so it doesnt affact the temp of the tube which can change photosynthesis. Fill it with sodium hydrogen carbonate which produces co2 and then add a pond weed. as its a plant it will soon make oxygen bubbles showing photosynthesis is happening. start a stopwatch and count every bubble for a minute x3. then repeat at 20 30 40cm away

Question 11

problems with this practical and solution

Answer 11

bubbles can be hard to count
bubble size differes- you can use a funnel and measuring cylinder to count the bubbles
at some point the light itensity being closer stops increasing the rate- thats because ther eis now a dif limiting factor eg temp

Question 12

what is the relationship between light intenity and photosynthesis

Answer 12

every time the distance away is doubled the light intensity is divided by four, also decreasing the rate of photosynthesis by four
light is inversely prop to distance squared

Question 13

how is glucose used

Answer 13

converted into insoluable starch for storage, it were stored as glucose it is soluable with water
used to respire with oxygen- oposite of photosynthesis
made into cellulose to strengthen the cell wall
combined with nitrate ions that can become enzymes as amino acids

Question 13

where is starch stored

Answer 13

leave cells for when its dark or bad conditions
areas such as tubes and bulbs, eaten as potatoes etc

Question 14

how do plants make amino acids/ protiens

Answer 14

they combine glucose with minerals from the soil

Question 15

how and what do plants do with fats and oils/ lipids

Answer 15

plants use energy from respiration and glucose to build them up and use them to strengthen the cell wall, energy stores in their seeds which helps provide energy

Question 16

how do greenhouses affect photosynthesis

Answer 16

the atmosphere is warmer inside as it traps out the cold, and is much more easily controlled

Question 17

what is hyperponic system

Answer 17

a system that controlls all the factors affacecting the rate of photosynthesis
co2 levels can be changed as well as light and temp, also theyre grown in water with the right neutrients which means that they dont need to waaste energy removing it from soil

Question 18

what are limiting photosynthesis factors at dif times

Answer 18

at night there is low temps usually and no light, but in the morning as those increase the co2 levels are quickly used up. in summer the rate will be faster than winter

Question 19

how dies co2 levels affect photosynthesis

Answer 19

its the lowest factor so usually limits the rate esp wehn its sunny and humid- co2 levels are stored and night and usually used up n the mornings.

Question 20

ways plants adapt to low nitrate areas

Answer 20

venus fly traps get their food and nutrients frpm insects they eat