photosynthesis Flashcards

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1
Q

what do plants use as energy

A

light

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2
Q

what is the reaction to trap light called

A

photosynthesis

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3
Q

what kind of reaction is photosynthesis

A

endothermic

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4
Q

where does photosynthesis take place

A

in the leaves which contain chlorophyll and absorbs light

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5
Q

what does the plant take in through the leaf

A

water and co2

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6
Q

what is the light energy used to convert c- and w- into
what else is produce

A

the light energy is used to convert carbon dioxide and water into glucose and oxygen is also produced

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7
Q

photosynthesis equation

A

carbon dioxide and water ——–> glucose + oxygen

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8
Q

what is photosynthesis when light intensity is 0

A

photosynthsis is 0 as light is essential

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9
Q

as light intensity increases

A

as light intensity increases so does photosytnthesis

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10
Q

more light energy =

A

reaction gets faster

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11
Q

how can we tell light intensity was a limiting factor

A

if we increase light energy intensity and pts also increases, light intensity was almost a limiting factor

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12
Q

limitng factor light intensity on graph

A

if we keep increasing light intensity there comes a point where rate pts no longer increases - something elseis a limiting factor like co2

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13
Q

how does the amount of chlorophyll in a leaf affect pts

A

leaves with less chlorophyll trap less light energy so a lower rate of photosynthesis

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14
Q

how does tempurature affect photosynthesis

A

as tempurature increases enzymes will work faster so rate increases, if kept increasing enzymes will denature so rate falls

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15
Q

uses of glucose: r-

A

respiration: release energy

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16
Q

ug: s-

A

starch
produces insoluble storage material starch which can be converted back into glucose when needed eg night

17
Q

ug: f- o-

A

many plants convert glucose into fats and oils which are used as a storage form of energy

18
Q

ug: c- cw

A

cellulose cell wall is made of glucose

19
Q

ug: am- ac-

A

produces amino acids so plats can synthesise proteins
plants need to absorb nitrate ions from the soil to make amino acid

20
Q

how do farmers increase the rate of photosynthesis and why
2 ways

A

to increase yield of crops produced
so farmers light and heat their greenhouses and also add extra co2 (expnesive)
some use oil bruners which release heat and co2 at the same time