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Biology A2 Unit 2 > Photosynthesis > Flashcards

Photosynthesis Flashcards

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1
Q

Structure or the upper and lower epidermis

A

One cell thick
Colourless
Covered with cutin (waxy)

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2
Q

Function of upper and lower epidermis

A

Protective

Waterproof cutin

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3
Q

Structure of palisade mesophyll

A

Chloroplasts
Close to upper surface - most light enters
Tightly packed

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4
Q

Function of palisade mesophyll

A

Photosynthesis

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5
Q

Structure of spongy mesophyll

A

Loosely arranged
Air spaces
Continuous pathway with stomata - facilitate gas exchange

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6
Q

Function of spongy mesophyll

A

Some photosynthesis

Gas exchange

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7
Q

Structure of vascular tissue

A

Extensive and finely branching network

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8
Q

Function of vascular tissue

A

Conduct water and minerals

Remove products if photosynthesis

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9
Q

Describe the structure of chloroplasts

A 
Large
Chlorophyll arranged into flatted membranes - thylakoids
Thylakoids arranged in stacks - grana
Chlorophyll absorbs light
Contain electron carriers
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10
Q

What does the absorption spectrum show

A

Relative absorption of light at particular wavelengths

See graph page 80 (two peaks)

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11
Q

What is the action spectrum and how is it obtained

A

⭕️It’s the rate of photosynthesis that takes place at different wavelengths
HOW?
- project light of different wavelengths on plant
- measure rate of photosynthesis: vol of gas given off in unit time

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12
Q

What is the graph for the action spectrum and what does it show

A

See pg 81 (two peaks)

Most photosynthesis at red and blue wavelengths- provide most energy for photosynthesis

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13
Q

What is a limiting factor

A

The factor in shortest supply

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14
Q

What is the law of limiting factors

A

At any given moment the rate of a physiological process is limited by the one factor in shortest supply and by that factor only

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15
Q

What do gross photosynthesis and net photosynthesis provide information on

A

The carbohydrate produced by a plant or part of a plant

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16
Q

What is the light compensation point

A

No net intake or output of CO2

Photosynthesis and respiration taking place at the same rate

17
Q

What happens at low light levels in terms of net photosynthesis

A

CO2 is given out

18
Q

What happens at high light intensities in terms of net photosynthesis and CO2

A

CO2 is taken in

19
Q

What is the carbon dioxide compensation point

A

Net gaseous exchange is zero for a given light intensity

Biology A2 Unit 2 (9 decks)

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