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Freshman year > Photosynthesis quiz > Flashcards

Photosynthesis quiz Flashcards

1
Q

Photosynthesis equation

A

6CO2 + 6H20 + light —> C6H12012 + 602

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2
Q

autotrophs

A

an organism that makes its OWN food

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3
Q

heterotrophs

A

consumers- must eat organic material

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4
Q

what organelle does photosynthesis occur in?

A

chloroplasts

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5
Q

what part of the plant is the major site for photosynth?

A

leaves - they are greenest part of the plant meaning they contain the most chlorophyll which is in chloroplasts

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6
Q

are chloroplasts double-membraned?

A

yes!

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7
Q

thylakoids

A

discs that contain chlorophyll - are the site of light reactions-

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8
Q

stack of thylakoids…

A

grana/granum

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9
Q

stroma

A

liquid inside a chloroplast - site of calvin cycle

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10
Q

names of 2nd part of photosynthesis

A

calvin cycle, dark reactions, light-independent reactions

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11
Q

chlorophyll

A

green pigment in thylakoids that captures light

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12
Q

palisade mesophyll

A

UPPER part of a leaf; majority of photosynth. happens here

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13
Q

stomata

A

opening in leaf that allows CO2 in and O2 out (also water)

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14
Q

when does a stomata close?

A

in high temperatures to avoid losing water

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15
Q

what parts of the photosynthesis equation are in dark reactions?

A

6CO2 in —> G3P —> C6H12O6 (glucose)

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16
Q

what parts of the photosynth. equation are apart of the light reactions?

A

6H20 —> in and 6O2 out

17
Q

Can humans see absorbed light?

A

No- we can only see reflected light

18
Q

how many types of chloroplast pigments are there?

A

4

19
Q

chlorophyll a

A

bright green - absorbs blue and red light and participates DIRECTLY in photosynth.

20
Q

chlorophyll b

A

dark green - absorbs blue and orange light and increases the range of light that can be absorbed

21
Q

carotenoids

A

yellow/orange - absorbs blue-green light and dissipates excess light to protect chlorophyll a

22
Q

anthocyanin

A

red, pink, blue, purple- absorbs blue-green light, absorbs light, and attracts pollinators

23
Q

photon

A

fixed quantity of light energy that excites electrons in light reactions

23
Q

photosystems

A

cluster of pigment molecules that attract photons

24
Q

what color do leaves absorb the most?

A

red and blue

25
Q

light reactions

A

absorbs solar energy to be converted to ATP and NADPH and O2 as a byproduct

26
Q

light reaction step 1

A

protons hit chlorophyll in PS2 –> excite electrons

27
Q

light reactions- what happens after electrons are excited?

A

electrons travel down electron transport chain

28
Q

light reactions - PS2 function

A

PS2 splits water to replace electrons (H+ and oxygen)

29
Q

light reactions - as the electrons move down ETC, what is their energy being used for?

A

electron’s energy is used to pump H+ to thylakoid space

30
Q

light reactions- what direction do H+ ions go?

A

H+ move to stroma (high to low) via ATP synthase

31
Q

light reactions- how is ATP produced?

A

ATP synth. rotates with H+ ions and produces ATP

32
Q

light reactions- what does PS1 do?

A

PS1 excites electrons and makes NADPH

33
Q

light reactions- what is the energy in the excited electrons used for after PS1?

A

electrons used to reduce NADP+ to NADPH (an electron carrier)

34
Q

Calvin cycle- Carbon Fixation

A

RuBis Co (an enzyme) attaches the 5-carbon molecule RUBP to a one-carbon molecule CO2 —> forms 2 molecules of 3-phosphoglycerate

35
Q

Calvin cycle - reduction

A

each 3-phosphoglycerate is reduced to form G3P (uses energy from ATP and electrons from NADPH)

36
Q

Phase 3 - regeneration

A

one molecule of G3P will leave to form sugars and the rest will be recycled to form RUBP

37
Q

photosystem 2

A

water-splitting

38
Q

photosystem 1

A

NADPH producing

Freshman year (28 decks)

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