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Biology OCR A > 5.6 Photosynthesis > Flashcards

5.6 Photosynthesis Flashcards

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1
Q

What type of nutrition is photosynthesis known as?

A

autotrophic nutrition

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2
Q

What are plants that photosynthesize known as?

A

photoautotrophs

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3
Q

What is it called when carbon dioxide is converted into sugars?

A

carbon fixation

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4
Q

Why is carbon fixation endothermic?

A

requires energy and additional electrons

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5
Q

What does respiration do in plants?

A

oxidize organic molecules to release chemical energy

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6
Q

Why is respiration exothermic?

A

releases chemical energy

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7
Q

What is it called when there is no net gain or loss of carbohydrate?

A

compensation point

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8
Q

What is the time taken to reach the compensation point called?

A

compensation period

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9
Q

Do shade plants have a longer or shorter compensation period?

A

shorter - can get minimal light easier

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10
Q

How long is a chloroplast?

A

2-10 um

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11
Q

What are the 2 distinct regions of a chloroplast?

A

stroma and grana

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12
Q

What are the bridges between grana called?

A

intergranal lamellae

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13
Q

What is each individual part of the grana called?

A

thylakoid

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14
Q

What is the funnel shaped structure within a thylakoid membrane called?

A

A photosystem

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15
Q

What are the pigments on the wall of the photosystem called?

A

Accessory pigments

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16
Q

What primary pigment does photosystem 1 have?

A

P700

17
Q

What primary pigment does photosystem 2 have?

A

P680

18
Q

What are the 2 pigments within chlorophyll a?

A

P700 and P680

19
Q

What wavelgnth does chlorophyll b absorb?

A

400-500nm, and 640nm

20
Q

what wavelenght do cartenoids absorb?

A

400-500nm

21
Q

what wavelength do xanthophylls absorb?

A

375-550nm

22
Q

What is it called when ATP is produced in the presence of light?

A

photophosphorylation

23
Q

What happens to water in PS2?

A

2H2O = 4H+ + 4e- + O2
aka photolysis

24
Q

what does water do?

A
  • source of protons (hydrogen) used in photophosphorylation
  • donates electrons to chlorophyll
  • source of a by product of oxygen
  • keeps plant turgid
25
Q

What are the two types photophosphorylation?

A

non-cyclic (PS1 and PS2 that produces ATP and NADPH)
cyclic (PS1 only producing ATP)

26
Q

What is an electron carier?

A

a protein with iron at its core

Biology OCR A (18 decks)

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