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GCSE Biology - Paper 1 > B8 - Photosynthesis > Flashcards

B8 - Photosynthesis Flashcards

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1
Q

What is the word equation for photosynthesis?

A

carbon dioxide + water -> glucose + water

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2
Q

What is the symbol equation for photosynthesis?

A

6CO2 + 6H2O -> C6H12O6 + 6O2

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3
Q

What sort of reaction is photosynthesis?

A

endothermic

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4
Q

Why is photosynthesis an endothermic reaction?

A

takes light engy from surrndgs. This breaks bonds holdin CO2 & H20 & causes fmtion new bonds in C6H12O6 & O2. xtra engy used for reaction take place = transferred from envrnment by light

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5
Q

Why does a leaf being broad make it more efficient at photosynthesis?

A

large surface area increases exposure to sunlight

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6
Q

Why does a leaf being thing make it more efficient at photosynthesis?

A

short diffusion distance

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7
Q

Why does a leaf containing chlorophyll make it more efficient at photosynthesis?

A

to absorb as much light as poss

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8
Q

Why does a leaf having veins make it more efficient at photosynthesis?

A

brings plenty of water in xylem to leaves for photosynthesis, takes away glucose in phloem

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9
Q

Why does a leaf having air spaces make it more efficient at photosynthesis?

A

increases surface area for gas exchange

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10
Q

Why does a leaf having guard cell make it more efficient at photosynthesis?

A

controls opening/ closing stomata - reducing water loss

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11
Q

How does light intensity affect the rate of photosynthesis?

A

light intensity ↑ = rate of phtsynths. ↑

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12
Q

What are the 3 limiting factors that affect the rate of photosynthesis?

A
  • CO2 conc.
  • light intensity
  • temp.
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13
Q

How does CO2 affect the rate of photosynthesis?

A

↑ CO2 = ↑ rate of phtsynths.

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14
Q

What happens when the slope on a limiting factor/rate of photosythesis graph stops increasing?

A

limiting factor has changed eg. to temp.

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15
Q

How is glucose used in respiration?

A

releases energy

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16
Q

What is glucose stored as in plants?

A

insoluble storage molecule starch

17
Q

What is glucose often converted into?

A

fats & oils

18
Q

What does glucose produce, which strengthens cell walls?

A

cellulose

19
Q

What type of acids does glucose produce?

A

amino acids

20
Q

What is the role of amino acids inside the plant?

A

protein synthesis

21
Q

What is needed to make amino acids from glucose?

A

nitrate ions from soil

22
Q

If we increase the light intensity and the rate of photosynthesis also increases, what does that tell us?

A

light intens. = limiting factor

23
Q

Why would farmers want to increase the rate of photosynthesis?

A

increases yield of crops

24
Q

How do ventilation vents maximise the rate of photosynthesis in greenhouses?

A

stops plants overheating

25
Q

How does having clear glass maximise the rate of photosynthesis in greenhouses?

A

allows more light in -> increases temp. of greenhouse

26
Q

How does having a parrafin heater maximise the rate of photosynthesis in greenhouses?

A

warms greenhouse & releases CO2

27
Q

How does having gravel under plants maximise the rate of photosynthesis in greenhouses?

A

allows drainage of water out pots -> waterlogged soil = little oxyg. & unable tp respire

28
Q

How does having an automatic watering system maximise the rate of photosynthesis in greenhouses?

A

consistent & right vol. of water @ right time

29
Q

How does having electric lighting maximise the rate of photosynthesis in greenhouses?

A

increases hours of light in Aut & Win -> ↑ light engy.

30
Q

How does having a removeable netting/whitewash maximise the rate of photosynthesis in greenhouses?

A

reduces intense Summer sunlight -> gives plants shade

31
Q

What are advantages of having a greenhouse?

A
  • can grow plants out season
  • protects plants insects
  • ensures max. plant growth
32
Q

What are disadvantages of having a greenhouse?

A
  • expensive maintaining light & temp.
  • uses lots engy. & water

GCSE Biology - Paper 1 (4 decks)

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