Photosynthesis Flashcards

1
Q

what are chemoautotrophs

A

oxidation of inorganic compounds as energy source

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2
Q

what are photoautotrophs

A

using light as energy source

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3
Q

describe the structure of chloroplasts (3)

A

thylakoid
grana
stroma

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4
Q

what is the thylakoid

A

flattened fluid filled sacs

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5
Q

what is grana

A

thylakoids make up grana

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6
Q

describe the grana

A

grana has high surface area, has pigment, enzymes and electron carrier
- lots of pigment + site of ATP synthase

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7
Q

what is in the stroma (6)

A
enzymes 
sugars
organic acids 
small ribosomes
loop of DNA
lipids
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8
Q

describe the location and overall reactions in light dependant reactions

A

thylakoid membrane

  • photolysis of water
  • photophosphorylation in synthesis of ATP
  • carrier molecule NADP
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9
Q

describe cyclic photophosphorylation (7)

A
PSI involved;
light energy absorbed;
electron excited;
emitted from chlorophyl;
chain of electron carriers;
ATP synthesis;
electron returns to PSI;
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10
Q

how are photosystem arranged (4)

A

pigments in light harvesting clusters;
primary pigment;
accessory pigment;
photosystem located in thylakoid;

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11
Q

describe non cylic photophosphorylation (5)

A
both photosystems involved;
photolysis of water;
H+ released from PSII;
e- released from PSI;
e- + H+ combine to NADP;
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12
Q

purpose of reduced NADP (3)

A

reduced GP;
TP formed;
in stroma;

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13
Q

purpose of accessory pigments (3)

A

pass energy to reaction centre;
absorb different wavelengths;
form light harvesting cluster;

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14
Q

where is the location of light independant reactions

A

stroma

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15
Q

describe the calvin’s cycle

A

RuBP + RuBisCo + co2 –> GP –> (rNADP - NADP) (ATP –> ADP + P) 2(TP) –> (ATP –> ADP) RuBP

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16
Q

what is triose phosphate used for (3)

A

glucose
amino acids
lipids

17
Q

factors affecting photosynthesis (5)

A
supply of co2
water
light energy
photosynthetic pigment
temperature
18
Q

how does temperature affect rate of photosynthesis

A

photosynthesis increases due to enzymes more active

best combo = high light + high temp.

19
Q

adaptations of leaves able to consume more carbon dioxide

A

leaves able to consume more carbon dioxide

  • thinner leaves
  • more stomata
  • more chloroplasts
20
Q

definition of limiting factors

A

a substance in shortest supply that affects the rate of photosynthesis

21
Q

how do you measure the rate of photosynthesis

A

using gas syringe to collect oxygen produced from plant

22
Q

describe bundle sheath cells in mesophyll

A

mesophyll cells surround bundle sheath cells

23
Q

what is present in bundle sheath cells (3)

A

carbon dioxide
RuBP
RuBisCo

24
Q

what takes place in bundle sheath cells

A

calvin cycle

25
describe the process to avoid photorespiration (6)
RuBP and RuBisCo is kept away from oxygen in bundle sheath cells carbon dioxide absorbed by mesophyll cells mesophyll cells contain PEP carboxylase - high optimum temp. PEP carboxylase catalyse carbon dioxide + PEP → oxaloacetate converted to malate malate decarboxylated and passed to RuBP by RuBisCo
26
how do you find Rf value
distance travelled by substance/distance travelled by solvent
27
describe the method for chromatography (10)
``` Grind leaf; Use solvent (organic); Leaf extract contains mixture of pigment; Concentrate extract; Pencil line drawn; Paper places in jar of solvent; Solvent rises up paper; Each pigment travels in different speed; Calculate Rf value; Compare values; ```