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Bisc 205 > Midterm 1-Plant physiology > Flashcards

Midterm 1-Plant physiology Flashcards

1
Q

What are some of the major environmental roles of plants?

A

Produce O2, Store Co2, Move water from land to the atmosphere, Primary producers of the food chain

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2
Q

Major Requirements for plants

A

1)Light
2)Co2
3)H2O
4)Nitrogen
5)Potassium
6)Phosphorus
7)Magnesium

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3
Q

Shoot system

A

Composed of the stem,leaves,and fruits these appendages are used to absorb sunlight, perform gas exchange, and where reproduction occurs

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4
Q

Root system

A

Below ground portion of the plant responsible for anchoring the plant,absorbing water and nutrients, storing energy, and maintaining symbiotic bacteria colonies

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5
Q

Tap root

A

A singular long thick root that grows down from the plant which the remained of the root system will branch off of. Found in eudicot plants.

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6
Q

Fibrous roots

A

a root that is one of many similar slender roots branching directly from the base of the stem of a plant. Found in Monocots

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7
Q

Phenotypic plasticity in plants

A

1) Leave sizes will change according to avalible sunlight with shaded plants producing larger leaves
2) Root size and adjust for drought conditions either shrinking or growing rapidly
3)Height as elevation changes, will decrease to be less wind prone

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8
Q

What is this a modification of, Name it and describe it’s function

A

Root, Anchor Root, Grow out of the stems and allow the plant to anchor itself to walls or tall plants

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9
Q

What is this a modification of, Name it and describe it’s function

A

Root, Prop Root, Help stabilize tall plants like corn from winds

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10
Q

What is this a modification of, Name it and describe it’s function

A

Root, Pneumatophores, specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees

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11
Q

What is this a modification of, Name it and describe it’s function

A

Root, Storage roots, Store carbohydrates and nutrients as a part of the taproot

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12
Q

What is this a modification of, Name it and describe it’s function

A

Shoot, Water Storage system, Stores water

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13
Q

What is this a modification of, Name it and describe it’s function

A

Shoot, Stolons, used in asexual reproduction

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14
Q

What is this a modification of, Name it and describe it’s function

A

Shoot, Rhizomes,Produce new plants copies and store carbs

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15
Q

What is this a modification of, Name it and describe it’s function

A

Shoot, Tubers, Stores carbohydrates under the ground

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16
Q

What is this a modification of, Name it and describe it’s function

A

Shoot, Thorns, protect from herbivores eating the plant

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17
Q

Two main parts of a leaf

A

Petiole and Blade

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18
Q

Name, Function

A

Simple leaf, Able to photosynthesize a lot

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19
Q

Name,Function

A

Compound leaf, reduce rain and wind damage

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20
Q

Name function

A

Double compound leaf, Reduce rain and wind damage

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21
Q

Name, Function

A

Needles, Found in Very hot or Very cold climates as they minimize water loss, poor at synthesis but last year round

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22
Q

What is this a modification of, Name it and describe it’s function

A

Leaf, Bulb,Stores food for the plant

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23
Q

What is this a modification of, Name it and describe it’s function

A

Leaf, Succulent leaves, stores water

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24
Q

What is this a modification of, Name it and describe it’s function

A

leaf,Tendrils,allows plant to stabilize itself and climb onto supports

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25
Q

What is this a modification of, Name it and describe it’s function

A

Leaf,Floral mimic, attracts pollinators to it’s actual flower

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26
Q

What is this a modification of, Name it and describe it’s function

A

Leaf, Traps, Allows plants to digest prey

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27
Q

Middle lamela

A

A pectin glue which holds plant cells together

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28
Q

Primary wall

A

Cellulose based plant wall that all plant cells have which keep the plant upright and prevent the cell from lysing from vacuole

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29
Q

Secondary wall

A

A wall found in specialized cells made of lignin and cellulose that provides strength to the plant

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30
Q

Simple pits

A

Thin areas of secondary walls that connect between cells

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31
Q

What is this? How can you tell?

A

Primary cell wall, Pectin in the structure and no lignin

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32
Q

What is this? How can you tell?

A

Secondary cell wall, you can see primary cell wall above it, presence of lignin

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33
Q

Why is cellulose indigestible to humans, why can some animals digest it?

A

The presence of B-bonds instead of the typical A-bonds and forms long thin sheets, Some animals use symbiotic bacteria to break it down

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34
Q

differences in the organelles of a plant vs animal cell

A

1) Large central vacuole(s)
2)Chloroplast
3)Reduced mitochondria

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35
Q

Plasmodesmata

A

Small gaps in the primary wall that allow connection to nearby plant cells

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36
Q

Structural differences of plant vs animal cells

A

1)Plant cells are cubical
2)Plant cells are larger than animal cells
3)Animal cells lack Plasmodesmata

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37
Q

What is this, Name it and describe it’s function

A

Plastid, Chloroplast, photosynthesis

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38
Q

What is this, Name it and describe it’s function

A

Plastid, Amylosplast, stores sugar

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39
Q

What is this, Name it and describe it’s function

A

Plastid, Chromoplast provides pigmentation to plants

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40
Q

Leaf modifications

A

Bulbs, succulent leaves,Tendrils, Floral mimic, Traps

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41
Q

Root modifications

A

anchor root, prop root, pneumatophores, storage roots

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42
Q

Shoot modifications

A

Water storage, stolons, rhizomes, tubers, thorns

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43
Q

Three types of plant tissues

A

1)Dermal
2)Ground
3)Vascular

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44
Q

Dermal tissue function

A

An outer coating of plants that helps prevent water loss,protect against pathogens, and in the roots absorb water and neutrients

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45
Q

Stomata

A

An opening in the dermal tissue composed of two guard cells that facilitate gas exchange

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46
Q

Cuticle

A

A waxy outer coating of plants that helps prevent the loss of water to the atmosphere

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47
Q

How does the positioning of the stomata relate to the plant type?

A

Stomata is placed wherever there is contact with the air so
Aquatic plants=no stomata
Floating plants=upper surface only
Land plants=Stomata concentrated at the top of the plant but underside also has them.

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48
Q

Trichomes

A

Small hair like appendages found on the dermal tissue of plants that reflect sunlight,reduce water flow, can act as barbs and can act as traps

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49
Q

What cell type is this? How can you tell?

A

Parenchyma, you can tell because of the thin cell walls and the intercellular space

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50
Q

Three types of ground tissue

A

Parenchyma, Sclerenchyma,Collenchyma

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51
Q

What cell type is this? How can you tell?

A

Collenchyma, thickened primary cell wall

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52
Q

What cell type is this? How can you tell?

A

Sclerenchyma, thickened secondary cell wall

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53
Q

Parenchyma

A

Most abundant type of ground tissue, responsible for photosynthesis as well as starch storage. It is totipotent and is able to heal wounds or perform asexual reproduction

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54
Q

totipotent

A

A cell that retains it’s ability to divide and differentiate

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55
Q

Collenchyma

A

unevenly thickened primary cell wall and sit near the vascular bundles of the stem providing flexible support

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56
Q

Sclerenchyma

A

Thick secondary cell walls, these cells are dead at maturity and provide rigid support for the plant. Composed of Sclerids and fibers

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57
Q

Xylem

A

Water containing cells that are hallow and lack cell wall ends transporting water and sugars up from the roots to the shoots. Composed of trachids and vessel elements

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58
Q

Trachids

A

one of the major components of xylem containing many pits through which water will flow through

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59
Q

Vessel elements

A

Found in angiosperms, they are a type of cell found in xylem that are longer and wider than trachids, they have both pits and perforations

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60
Q

Phloem

A

a type of vascular tissue that transports sugar, amino acids,hormones up and down the plant. Composed of seive-tube elements and companion cells

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61
Q

companion cells

A

maintain the cytoplasm & plasma membrane of
sieve-tube elements via the plasmodesmata

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62
Q

Seive-tube elements

A
  • long, thin cells with perforated ends (sieve
    plates). Lack nuclei & require companion cells to survive
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63
Q

What is this, what plant type, how can you tell?

A

Monocot stem, vascular bundles embeded at random in the stem with phloem facing outward and xylem facing inward

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64
Q

What is this, what plant type, how can you tell?

A

Dicot stem, Vascular bundles aranged in a circular pattern with phloem,cambium,xylem and piths at the core of the stem

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65
Q

What is this, what plant type, how can you tell?

A

Monocot root,xylem is aranged in a star shape and a central pith is present

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66
Q

What is this, what plant type, how can you tell?

A

Dicot root, xylem is aranged in a cross shape, and there is no central pith

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67
Q

Monocot

A

1 cotlydon, narrow leaves with parallel veiniation, scatered vascular bundles and flowers with multiples of 3

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68
Q

Eudicot

A

2 cotlydon, broad leaves with network veination, circular bundles of vascular tissue, and flowers in multiples of 4 or 5

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69
Q

Primary growth

A

Growth of a plant which lengthens the tips of the plants and the roots of the plant. The primary xylem and phloem are formed in this growth

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70
Q

Secondary growth

A

Growth of the plant which widens the roots and shoots of the plant. This is done through growth of the secondary xylem and phloem

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71
Q

Apical bud

A

the type of bud located at the top (apex) of the plant, particularly at the very tip of the main stem that will only grow when damaged otherwise prevents continuous primary growth

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72
Q

Meristem

A

totipontent cells which form the apical meristem

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73
Q

How can you identify the meristem cells in this picture?

A

1)Small size
2)Cuboidal shape
3)Large nuclei
4)Nuclei is central
5)Thin cell walls
6)small vacuole
7)Desne cytoplasm

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74
Q

3 types of meristem tissue

A

1)Protoderm
2)Ground meritstem
3)Procambium

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75
Q

Protoderm

A

Meristem which differentiates into dermal tissue

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76
Q

Ground meristem

A

Meristem which will differentiate into parenchyma, collenchyma,and sclerenchyma

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77
Q

Procambium

A

Meristem which diffrentiates into xylem and phloem

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78
Q

3 zones of primary growth

A

1)Celleular division (protoderm, ground meristem, procambium)
2)Cellular elongation (Vascular,ground,dermal)
3)Cellular maturation( Forming of structures)

79
Q

Root cap

A

protects meristem using a lubricante that helps guide the growth of the root downward

80
Q

Cambium

A

Forms the cylinders of cells dividing phloem and zylem that will differentiate into the secondary phloem and zylem

81
Q

Types of cambium

A

1)Cork cambium located near the edge of the shoot
2)Vascular cambium, separates phloem and xylem

82
Q

Lenticles

A

openings in bark that allow gas
exchange. Inconspicuous in
many tree species.

83
Q

Heartwood

A

Dark xylem interior wood used as a structural support, incapable of water transport. It does produce resin and gum

84
Q

Sapwood

A

Outer layer, light coloured xylem that conducts water

85
Q

What can tree rings tell us about a tree?

A

Dry, cold, low sunlight-very little growth in the rings
Warm,rainy, sunlight abundant- large growths in the tree rings

86
Q

Isotonic

A

Solute concentration inside and out of the cell is equivalent meaning no net movement of water

87
Q

Hypertonic

A

Solute concentration is greater outside of the cell than inside and water moves from the cell to the enviroment

88
Q

Hypotonic

A

Solute concentration is greater inside the cell than outside of the cell leading to water flowing from the environment into the cell

89
Q

Water potential

A

Potential energy of the water compared to that of pure water at
atmospheric pressure & room temperature

90
Q

How is water potential calculated

A

Ψ=Ψsolute+Ψpressure where solute is always negative and pressure is positive in living cells but negative in xylem

91
Q

Solute potential

A

tendency for water to want to move via osmosis

92
Q

Pressure potential

A

Comprised of turgor pressure and wall pressure it is the tendency for water to move in response to changes in pressure

93
Q

Three hypothesis for water transport

A

1)Root pressure
2)Capillary action
3)Cohesion tension theory

94
Q

Symplastic route

A

water moves across root cells through the plasmodesmata, only applies to small solutes

95
Q

Transmembrane route

A

Water moves between the membranes of cells via aquaporins

96
Q

Apoplastic route

A

water moves along the cell walls until it hits the casparian strip and is then forced into the transmembrane or symplastic route

97
Q

Casparian strip

A

Ring of waxy suberin preventing things coming from the cell walls into the plant

98
Q

Root pressure

A

water and ions move into the root increasing Ψs in the roots forcing water up the plant

99
Q

Guttation

A

the process of secretion of water droplets from the pores of some vascular plants like grass and is due to root pressure

100
Q

Capillary action

A

movement of water up a narrow tube due to three forces surface tension, adhesion and cohesion

101
Q

Conditions for transpiration

A

1)Stomata are open
2)Atmosphere must be drier than air in the leaves

102
Q

What force is used to open stomata

A

turgor pressure

103
Q

Two factors that cause the stomata to open

A

1)Blue light response
2)Photosynthesis

104
Q

How do stomata open

A

1)Phototropins are activated via blue light
2)Proton pumps create a gradient by moving H+ outside the cell membrane
3) To balance this K+ is brought in and Cl- helps move H+ back into the cell
4)K+ causes the conversion of starch into malate, increasing solute concentration and forcing water inside the cell

105
Q

Factors that reduce soil water potential

A

Salty soil
Dry air
Irrigation and salinification

106
Q

xerophytes

A

Plants in dry habitats have adaptations that help them slow transpiration and limit water loss

107
Q

Photo synthesis-transpiration compromise

A

To reduce the loss of water in dry environments stomata close but with out open stomata no Co2 can be used for photosynthesis

108
Q

How do plants survive highly salty environments

A

Storing high concentration of solutes in their roots to allow water to still move towards their roots

109
Q

How do plants survive dry environments

A

Cuticle,Trichomes,crypt stomata, needle leaves,succulent ass behaviour of opening stomata at night

110
Q

Translocation

A

Movement of sugars from sources to sinks where the sinks are on the smae side of the plant as the source

111
Q

Pressure flow hypothesis

A

1)Source cells move sugars into companion cells via active transport
2)Water moves from xylem into phloem via osmosis increasing pressure
3)Pressure increase causes water to flow down the phloem into the sink

112
Q

Two types of cotransporters

A

Symporters- transported good and its companion end up on the same side
Antiporter- transported good and companion end up on opposite side

113
Q

How does pholem unload sugar at the sink

A

1)Sucrose moves into companion cell via concentration gradient
2)Sucrose is moved into a tonoplast via an antiporter or is used by the developing cell

114
Q

Macro Nutrients

A

N,P,K,Mg,Ca,S

115
Q

Micro nutrients

A

Fe,Mn,Zn,Cu

116
Q

Mobile Nutrients

A

Nutrients that move around the leaves from old to new, Nitrogen,Potassium,Phosphorus,Magnesium, Zinc, Molybdenum

117
Q

Immobile Nutrients

A

Nutrients that cannot be moved around the plant, Calcium,Iron,Sulphur,Copper,Manganese,Boron

118
Q

How does soil texture impact plant growth

A

1)Ability of plant to penetrate the soil with roots
2)Soil retention of water
3)Air spaces necessary for respiration

119
Q

Loams

A

A soil type that combines sand,silt, and clay as well as organic matter, it is the idea growing condition for plants

120
Q

Leaching

A

The loss of nutrients to the soil due to excess water moving through the soil

121
Q

Major soil anions

A

Phosphate,Sulphate,Nitrate, and Chlorine

122
Q

Why are cations hard to acquire from the soil?

A

Organic matter is negatively charged and so attracts the positive cations making them difficult to obtain

123
Q

Major soil cations

A

Ca2+ , Mg2+ , K+ , Na+

124
Q

Soil Ph and plant growth

A

Slightly acidic conditions ph 5.5-7 are preferred by plants as it makes cation exchange easier to preform

125
Q

Cation exchange

A

Root hairs will release CO2 into water which reacts to form H+ ions that free the cations attached to organic matter making them available for uptake

126
Q

CEC

A

Cation Exchange capacity, Measures negatively charged sites in soil available to bind cations & release plant nutrients, organic matter like clay has higher CEC than inorganic sand or gravel

127
Q

Describe the uptake of both cations and anions in plants

A

1)H+ is pumped outside of the membrane creating a gradient
2)Cations follow the gradient and move in via a proton channel
3)H+ and Anions move inward via co transporter

128
Q

Describe the mutalistic relationship between Mycorrhizal Fungi and Plants

A

1)Increase surface area of plant roots allowing for more nutrient absorption
2)Help to acquire macro nutrients
3)Protect plants from invaders with antibiotics
4)Produce auxin to stimulate plant root growth

129
Q

Passive exclusion

A

Exclusion of toxic ions via lacking the proper transporters to move them within the cell

130
Q

Active exclusion

A

Exclusion of a toxic ion via storing said ion in a tonoplast to prevent it from damaging the plant or through the use of metallothioneins and
phytochelatins

131
Q

metallothioneins and
phytochelatins

A

Enzymes that detoxify harmful ions to the plant

132
Q

Atmosphere composition

A

78% nitrogen, 21% oxygen,0.04% CO2 and 0.96% everything else

133
Q

Why is atmospheric nitrogen largely inaccessible

A

Nitrogen forms a triple bond with itself into a N2 molecule that is extremely stable and difficult to break apart

134
Q

Nitrogen Fixation

A

The process of turning atmospheric nitrogen into usable forms of nitrogen (NH3,NO2,NO3) via bacteria or archea

135
Q

Describe the steps of Nitrogenous catalyzed conversion of N2 into NH3

A

1)Small nitrogenase complex with the help of 16 atp causes iron3 to be reduced producing electrons
2)Mo-F-S capture the atmospheric nitrogen in the large complex
3)The excess electrons from the reduction of iron 3 are passed to the Mo-Iron 2 complex
4)Mo-Fe2 complex reduces N2 into NH3

136
Q

nodules

A

special area of the the plants root where symbiotic nitrogen fixing bacteria are stored

137
Q

rhizobia

A

Nitrogen fixing bacteria that have a symbiotic relationship with legumes

138
Q

leghemoglobin

A

protects nitrogenase by
binding O2, which interferes with its activity

139
Q

Process of infecting roots with rhizobia

A

1)Root hairs release flavanoids which attract the rhizobia
2)Rhizobia produce nod factors as they approch the root which begins the formation of the infection thread
3)Rhizobia multiply and enter the plant through the infection thread
4)Infection thread then forms a membrane around the rhizobia
5)Nod factors stimulate cell division in the root hairs and form the nodules

140
Q

Parasitic plants

A

Plants that obtain water and nutrients by penetrating another plants xylem using Haustoria

141
Q

Haustoria

A

penetrates the tissues of a host and absorbs nutrients and water

142
Q

Epiphytes

A

grow on leaves or branches of trees
Not parasitic, but use host for support and access to sunlight, due to not having proper roots they absorb water through their leaves through the air or from rainwater

143
Q

Carnivorous plants

A

use modified leaves to trap insects & other animals usually found in bogs as they have little access to nitrogen from the soil

144
Q

Light coupled Reaction

A

1)H2O split to form O2
2) Electrons from H2O are excited by light energy
3) High-energy electrons are transferred to the
electron carrier NADP+, forming NADPH
4)ATP is produced

145
Q

Light-independent reactions (Calvin cycle)

A

1)Produce sugar (organic C) from CO2
byusing up the Electrons and ATP from light-dependent reactions are used to reduce CO2

146
Q

Stroma

A

analogous to the mitochondrial matrix and contains many metabolic enzyme

147
Q

Stroma Lamelle

A

connect thylakoids of two different grana. They increase the efficiency of photosynthesis by keeping grana at a distance so that they do not clutter together

148
Q

Thylakoid

A

any of the membranous disks of lamellae within plant chloroplasts that are composed of protein and lipid and are the sites of the photochemical reactions of photosynthesis.

149
Q

Pigments

A

absorb specific wavelengths of
light and reflect others

150
Q

Chlorophyll A

A

the predominant type of chlorophyll found in green plants and algae

151
Q

Light harvesting complex

A

Captures light energy and passes the energy from pigment molecule to pigment molecule until it ejects two electrons to Chlorophyll A

152
Q

What happens when light hits a surface?

A

1)Reflected
2)Absorbed
3)Transmitted

153
Q

Cartenoids

A

Absorb blue & green light
* Reflect & transmit yellow, orange,
& red light

154
Q

Chlorophylls A and B

A

Absorb red & blue light
* Reflect & transmit green light
* Main photosynthetic pigments

155
Q

Why does Chlorophyll look like this

A

1)Head absorbs light
2)Tail anchors Chlorophyll to thalkaloid

156
Q

Carotenoids & xanthophylls function in plants

A
  1. Extend the range of wavelengths of
    light energy capture
  2. Protect chlorophyll from damage by
    absorbing some of the light energy &
    stabilizing free radicals
  3. Provide colour to flowers & fruits
157
Q

Why do leaves change colour in fall?

A

Chlorophyll production stops so Chlorophyll is broken down & components(N) stored in stem & roots for use in spring this Prevents loss of N from plant if the green leaves were to drop to the ground

158
Q

General formula for photosynthesis

A

CO2 +H2O+light energy-> (CH2O) +O

159
Q

Photosystem

A

group of 300–400 chlorophyll &
accessory pigments in the thylakoid membrane

160
Q

3 Possibilities for energized electrons

A

1)Florescence or release of heat energy
2)Resonance Energy Transfer
3)Reduction/Oxidation where electrons are transferred to a new host

161
Q

Antenna Complex

A

Molecules which absorb light energy passing the energy to neighbouring antenna via resonance energy transfer

162
Q

Photosystem 1

A

Generates NADPH from reduction of NADP+ using H+ from Photosystem II

163
Q

Photosystem 2

A

Generates ATP from a proton gradient established using photon
energy and Splits H2O to obtain an electron that is passed to Photosystem I

164
Q

Describe the production of ATP in Photosystem 2 complex

A

1) pheophytin accepts electrons
2)Electrons enters electron transport chain across thylakoid membrane
3)Electrons are then passed to plastoquinone which carry them to the cytochrome complex
4)PQ transports H+ from chloroplast stroma to thylakoid lumen, increasing [H+] 1,000x
5)Creates an electrochemical gradient and proton motive force
6)Protons move down their concentration gradient through ATP synthase, creating ATP

165
Q

Formula for water splitting

A

2H2O –>4H+ 4e- +O2

166
Q

Describe the process of generating NADPH using photosystem 1

A
  1. Electron from Photosystem II passed to Photosystem I by plastocyanin (PC): links the 2
    photosystems together
  2. Special pair of chlorophyll molecules (P700) absorb 700 nm wavelength: electron is
    excited again by photons & are transferred to ferredoxin
  3. Ferredoxin transfers electron: NADP+ is reduced to NADPH via NADP+ reductase
167
Q

Z scheme

A

electrons are excited by photosystem II to generate ATP then excited again
by photosystem I to reduce NADP+ to NADPH

168
Q

Cyclic electron flow

A

Photosystem I also sends
excited electrons back to
the electron transport chain
to generate ATP instead of
passing them to NADP+ to
form NADPH

169
Q

Calvin Cycle

A

series of chemical reactions that
convert CO2 into sugar

170
Q

Fixation

A

CO2 reacts with RuBP and RuBisCo The resulting 6-C molecule splits into 2, 3-C molecules of 3PGA

171
Q

Reduction

A

3PGA are phosphorylated by ATP & reduced by NADPH producing glyceraldehyde 3-phosphate (G3P) One G3P is used to make sugar

172
Q

Regeneration

A

The remaining 5 x G3P used to regenerate RuBP

173
Q

Roles for G3P

A
  1. G3P used to make amino acids, nucleotides, & other molecules
  2. G3P broken down via cellular respiration in the mitochondria to generate ATP
  3. Excess G3P is converted into starch for storage
  4. G3Ps are used to make sucrose, a disaccharide
174
Q

Rubisco

A

Cubical molecule that Catalyzes the addition of
either CO2 or O2 to RuBP

175
Q

Cost of each step in the Calvin cycle plus its net product

A
  1. Fixation step
    * 3 RuBP, 3 CO2 , 3 H2O
  2. Reduction Step
    * 6 ATP , 6 NADPH
  3. Regeneration Step
    * 3 ATP
    Product: 1G3P
176
Q

Regulatory mechanisms for photosynthesis

A

1)When sugar content is too high storage of sugars becomes preferred over synthesis of new sugars
2)When Light or CO2 levels are low RUBISCO becomes deactivated
3)If O2 content is too high then photorespiration occurs instead of photosynthesis

177
Q

Photorespiration

A

a process which involves loss of fixed carbon as CO2 in plants in the presence of light, wastes energy and steals carbon which supresses the photosynthesis process

178
Q

C3 vs C4 pathway

A

the length of the carbon chain of the compound CO2 is organically fixed into where C3 uses the Calvin cycle and C4 can use both the Calvin cycle and the Hatch-Slack Pathway

179
Q

C4 Pathway

A
  1. HCO3- (1-C) reacts with phosphoenolpyruvate (3-C) to form a 4-C molecule (malate or aspartate)
    * Enzyme PEPCase
  2. 4-C molecule diffuses close to vascular bundles
  3. Enzyme NADP-malate dehydrogenase releases CO2 yielding 3-C pyruvate. CO2 is taken up by chloroplasts, increasing the concentration of CO2 for rubisco
  4. 3-C pyruvate diffuses back to external region
  5. Enzyme pyruvate-phosphate-dikinase regenerates phosphoenolpyruvate
180
Q

Kranz anatomy

A

Inner ring of bundle sheath around vascular tissue, outer ring of mesophyll cells
* Makes a diffusion barrier between mesophyll cells that uptake CO2 from rubisco
in bundle sheath cells, facilitating C4

181
Q

Benefit of Kranz anatomy

A

Increases CO2 concentration
in bundle-sheath cells where
RuBisCo is active so less O2
binds Spatial separation of CO2
absorption & C fixation in the
Calvin cycle

182
Q

C4 photosynthesis benefit

A

High affinity for CO2 by PEP carboxylase (no competition with O2) means stomata can be open for shorter periods of time, reducing water loss

183
Q

Examples of C4 plants and their growing conditions

A

Corn,millet,Cabbage all prefering warm and dry climates

184
Q

CAM Plants

A

keep stomata closed during the heat of the day and open them at night when it is cooler

185
Q

Night time reaction of CAM plants

A

Stomata open; CO2 enters, reacts with H2O to form HCO3-

PEPCase catalyzes reaction between HCO3- & 3-C
phosphoenolpyruvate forming 4-C oxaloacetate
Oxaloacetate is reduced to malate by NAD(P)+-
malate dehydrogenase and is stored in a vacuole

186
Q

Daytime reaction of CAM plants

A

Stomata closed
* Malate released from vacuoles & is transformed by
NADP-malic enzyme into 3-C pyruvate & CO2
* CO2 enters chloroplast where it increases the CO2
concentration around RuBisCo for the Calvin cycle

187
Q

What type of photosynthesis leaf is this, how can you tell?

A

C3, not super efficient leaf design

188
Q

What type of photosynthesis leaf is this, how can you tell?

A

C4, Bundle Sheaths and Leaf anatomy is designed to intercept CO2 as soon as it enters
the plant

189
Q

What type of photosynthesis leaf is this, how can you tell?

A

CAM, Presence of Aquiferous Parenchyma

190
Q

Which plant type has the advantage in warm environments

A

C4 plants have a competitive advantage over C3 plants due to a lower
rate of photorespiration

191
Q

Which plant type has the advantage is cooler climates

A

C3 plants have a competitive advantage as most of their photosynthetic
cells complete the Calvin cycle

192
Q

Which plant type has the advantage in dry climates

A

CAM plants have a competitive advantage as they conserve water that
would be lost to transpiration during the heat of the day

193
Q

Rank the plant types by photo respiration rate

A

C3>C4>CAM

194
Q

Order Of Enzymes Electrons pass through between photosystem 1 and 2

A

pheophytin->electron transport chain->plastoquinone carries to cytochrome complex->plastocyanin->ferredoxin->NADP+

Bisc 205 (3 decks)

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