CHAPTER 8

Question 1

where does photosynthesis take place

Answer 1

in the leaves of plants, in chlorophyll in chloroplasts

Question 2

what happens during photosynthesis

Answer 2

energy from the light is used to turn carbon dioxide and water into glucose and oxygen

Question 3

what is the equation for photosynthesis

Answer 3

carbon dioxide +water -> glucose + oxygen

Question 4

chemical formula for glucose

Answer 4

C6 H12 06

Question 5

is photosynthesis an endo or exothermic reaction

Answer 5

endothermic

Question 6

why is photosynthesis and endothermic reaction

Answer 6

it requires energy to break bonds between co2 and h2o

Question 7

how are leaves adapted for photosynthesis 5

Answer 7

large sa
very thin
chlorophyll in the chloroplasts on the upper side of leaf veins to give the cells nutrients they need and to remove waste products
air spaces to allow co2 to reach all cells

Question 8

why would a photosynthesising leaf turn iodine blue black

Answer 8

starch is made up of simple sugars like glucose

Question 9

relationship between starch and glucose

Answer 9

carbohydrates like starch are made up of simple sugars like glucose

Question 10

limiting factors for photosynthesis 3

Answer 10

light
temperature
co2 concentration

Question 11

how is light a limiting factor of photosynthesis

Answer 11

when there is no light, the cells cant get the energy they need to turn the reactants into products

Question 12

how is temperature a limiting factor of photosynthesis

Answer 12

an increase of temperature will increase the rate of reaction
photosynthesis is controlled by enzymes so a very high temperature will denature them

Question 13

how is carbon dioxide a limiting factor for photosynthesis

Answer 13

plants need co2 for photosynthesis too little co2 means photosynthesis cant take place

Question 14

when is co2 a limiting factor and why

Answer 14

in the day at night plants respire but don’t photosynthesise = more co2 in the day, plants photosynthesise and respire = less co2

Question 15

why chlorosis so bad for plants

Answer 15

the yellow colour there means there is no chlorophyll for photosynthesis so the plant cant grow and therefore dies

Question 16

how do plants use glucose

Answer 16

to make cellulose for strong cells walls to get stored as starch
to get stored in seeds
to get stored as lipids
to make protein

Question 17

why is it better to store glucose as starch

Answer 17

glucose is soluble in water meaning it affects the water concentration and therefore osmosis

Question 18

where is starch stored

Answer 18

roots stem and leaves

Question 19

how do plants turn sugars into protein

Answer 19

they combine the sugars with nitrate ions and other nutrients in the soil

Question 20

why can only certain plants like venus fly traps live in bogs

Answer 20

there is no nitrate ions to be turned into protein for growth so they get it from animals they eat

Question 21

how do greenhouses effect photosynthesis 2

Answer 21

they are warm so the process speeds up

the owner can control everything

Question 22

what is hydroponics

Answer 22

when plants are grown in a solution with optimum nutrients

Question 23

what is different about hydroponics rather than a greenhouse

Answer 23

in hydroponics you can control everything

Question 24

how do algae get co2

Answer 24

absorb it form the water surrounding them

Question 25

when you get a straight line on a graph of photosynthesis what does this tell you

Answer 25

something has become the limiting factor

Question 26

what is the light intensity inverse square law

Answer 26

light intensity is indirectly proportional to the distance 2

Question 27

what is cellulose used for

Answer 27

strength

Question 28

what do plants do 24/7

Answer 28

respire

Question 29

advantages of hydroponics 3

Answer 29

less staff needed
shorter growth time
larger final crop

Question 30

disadvantages of hydroponics 3

Answer 30

expensive monitoring equipment
alarms if things go wrong
energy needed to maintain optimum conditions