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GCSE AQA Science Biology > B8: Photosynthesis > Flashcards

B8: Photosynthesis Flashcards

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1
Q

Where is the chloroplasts situated?

A

In the leaf

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2
Q

Where is chlolorphll

A

Pigment inside

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3
Q

What does photosythesis allow?

A

Plants to create their own food

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4
Q

Where and when does photosythesis occur?

A

In the green parts of plants(chloroplasts which contain a green substance called chlorophyll)when there is light

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5
Q

How is energy transferred during photosythesis.

A

Energy is transferred from the envriroment to the chloroplasts by light

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6
Q

What is the energy used for?

A

To convert carbon dioxide and Water to glucose(a simple sugar) -oxygen is a by product

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7
Q

What type of reaction is photosythesis?

A

Endothermic reaction

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8
Q

What do endothermic reactions need?

A

An input of energy from the enviroment

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9
Q

What is the word equation for photosythesis?

A

Carbon dioxide + water-light-glucose+ oxygen

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10
Q

What is the symbol equation for photosytheis?

A

6CO2 + 6H2O-light- C6H12O6+6O2

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11
Q

How can we tell if water molecules are being produced

A

Air bubbles

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12
Q

What are 6 adaptations of the leaves for photosythesis?(so a plant can photosythesise as much as possible

A
  • leaves are broad(bigger SA for light)
  • leafes are thin(diffusion for gases are short)
  • they contain chlorophyll in the chloroplasts to absorb light
  • veins-water from the xylem
  • air spaces allow CO2 to get into cells and oxygen to leave by diffusion
  • guard cells open and close to regulate gas exchange
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13
Q

What are 3 possible limiting factors of photosythesis?

A
  • light(intensity)
  • temperature(photosytheis is controlled by emzymes)
  • carbon dioxide concentration(needed for photosythesis)
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14
Q

When can a plant not make enough chlorphyll?

A

When it does not have enough minerals (esspecially magnesium)

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15
Q

What does the inverse square law state?

A

As tne distance of light from the plant increases, the light intensity decreases

Light intensity= 1/distance squared

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16
Q

What is the reverse of photosythesis?

A

Respiration

17
Q

Startch is ____ in water

A

Insoluble

18
Q

What is needed for plants to grow as fast as possible?

A
  • warm enviroment
  • plenty of light
  • CO2
  • water
19
Q

How manipulate the enviroment for plants?

A

Garden greenhouse

20
Q

How dpes a greenhouse affect the rate of photosythesis?

A

-the glass means the enviroment is much more controlled than in a feild

it increases the rate of photosythesis and allows us to plant crops that wouldn’t grow well pousidd

21
Q

Why is controlling everything important?

A

-it prevents natural limiting factors from the time of day(temperature, light ect)

22
Q

What is the name of the system that allows all limiting factors to be controlled?

A

Hydroponics

23
Q

Is keeping the conditions in greenhouses just right expensive?

A

Yes but less staff are needed and there a greater number of crops and the crops are cleaner(profit)

24
Q

Which chemical in the leaves is required for photosynthesis?

A

Chlorophyll

25
Q

In which cell organelle do the reactions of photosynthesis take place?

A

Chloroplast

26
Q

In which layer of the leaf does the most photosynthesis take place?

A

Palisade layer

27
Q

The diagram shows the experimental setup to investigate the effect of light intensity on the rate of photosynthesis.

What is the function of the beaker of water?

A

Acts as a heat shield

28
Q

Why does temperature increase the rate of photosynthesis (up to a certain point)?

A

As temperature increases the rate of enzyme activity also increases.

29
Q

Look at the diagram. On focus eLearning you completed this practical to investigate the effect of light intensity on the rate of photosynthesis.

Identify the independent variable in this investigation.

A

Distance the lamp is from the plant

30
Q

Look at the diagram. On focus eLearning you completed this practical to investigate the effect of light intensity on the rate of photosynthesis.

Identify two control variables in this investigation.

A
  • volume of water in the test tube

- concentration of carbon dioxide

31
Q

The graph shows the effect of temperature on the rate of photosynthesis.

Explain why the the graph decreases to a rate of zero.

A

The enzymes have become denatured and can not longer catalyse the reactions.

32
Q

Point B on the graph is called the compensation point. This indicates where…

A

The rate of photosynthesis is equal to the rate of respiration.

33
Q

What type of reaction is phototythesis”

A

Endothermic

GCSE AQA Science Biology (14 decks)

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