Lecture 9 Flashcards

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1
Q

Pressure potential (p)

A

Negative (water getting vacuumed)
Positive (water getting pushed)

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2
Q

Solute potential (s)

A

Value is always negative
Water moves towards higher [solute]

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3
Q

Matric Pressure (m)

A

Pressure from Adhesion and Cohesion
Tubes i.e xylem cells

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4
Q

Water Vapour Pressure (h)

A

Increases as water vapour in the air increases
Maximum at warm, dry air
Dryer air = higher (more negative) vapour pressure potential = lower RH

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5
Q

Gravity potential (g)

A

Straight forward
Higher (more negative) value as height increases

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6
Q

Water potential in trees (plants)

A

Higher to lower water potential (less to more negative) from roots to leaves
Water potential gets more negative as you go up the tree

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7
Q

What’s Autotrophy

A

Makes their own complex carbohydrates from inorganic Carbon sources
Photosynthesis, Chemosynthesis

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8
Q

What’s Heterotrophy

A

Uses organic sources of Carbon to derive energy

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9
Q

What trophic strategies do fungi and animals use

A

Exclusively heterotrophs

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10
Q

What’s organisms are the most diverse in trophy strategies

A

Prokaryotes (Bacteria and Archaea)

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11
Q

What species are chemosynthesizers

A

Only found in prokaryotes

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12
Q

Photosynthetically active radiation (PAR)

A

Blue and red light are absorbed the most by the plant pigment chlorophyll

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13
Q

What affects the quality and quantity of light in photosynthetic rates?

A

Latitude (angle of solar radiation)
Clouds
Landscape features
Position of the plant relative to other plants
Depth in aquatic systems

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14
Q

What is Light Partitioning in Forests

A

Trees are adapted to varying levels of PAR

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15
Q

Lights on Water Depth

A

Red light doesn’t reach deep levels (prob b/c of low energy) - organisms nearer the surface are appear green b/c red absorbed
Blue light reaches the deepest - red reflected (blue absorbed)

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16
Q

Net Photosynthetic Rate (NPR)

A

NPR increases as photosynthetic photon flux density (PPFD) increases to a saturation point

17
Q

what’s Light Compensation Point (LCP)?

A

light intensity at which photosynthesis = cellular respiration

18
Q

What happens above LCP?

A

Plant is making more sugars than it uses

19
Q

Adaptations of Sun plants

A

higher Pmax but are inefficient in using low PPFD

20
Q

Adaptations of Shade plants

A

Achieve small Pmax but more efficient at using low PPFD

21
Q

C3 plants

A

initial C fixation AND Calvin cycle in mesophyll
- both processes in the day time

22
Q

why do C3 plants struggle in hot climates

A

RUBISCO is inefficient at high temps

23
Q

C4 plants

A

Calvin cycle (bundle sheath) physically separated from light reactions (mesophyll)

24
Q

CAM plants

A
  • in most extreme climates
    Carbon fixation (night) and Calvin cycle (day) temporally separated