Week 6 Quiz Flashcards

1
Q

Rubisco

A

Enzyme that attracts CO2 and O2

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2
Q

Consequences of CAM

A

CO2 uptake at night - cooler temperatures - higher relative humidity- less water loss

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3
Q

Carbons in RuBP

A

5

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4
Q

Costs of C3

A

Does not function well at high temperatures

Rubisco has a higher affinity for O2 at high temperatures

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5
Q

Why most plants use C3

A

They evolved when CO2 was abundant (now O2 is abundant)

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6
Q

Pep carboxylase

A

Virtually no affinity for O2
Used in C4
In mesophyll cells

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7
Q

Mesophyll cells

A

Used in C4
Surround bundle sheath cell
Contain PEP (3 carbon) and pep carboxylase
Use a lot of ATP

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8
Q

Bundle sheath cells

A

Are surrounded by mesophyll cells

Do Calvin cycle

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9
Q

CAM photosynthesis

A

Open stomata at night
Collect CO2 at night
Use to create Malic acid, which is stored in a vacuole
(Converts Malate to Malic acid at night)
Converts Malic acid back to Malate during day when stomata are closed to do the Calvin cycle

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10
Q

Pros of limiting Surface area

A

Maximize storage area for Malic acid (?) and minimize surface are for water loss

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11
Q

C3 costs

A

Photo respiration at high temperatures

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12
Q

C4 costs

A

ATP intensive

-costs at low temperatures

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13
Q

CAMS costs

A

Low overall photosynthesis rate

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14
Q

Grams of carbon fixed/kilo of water lost

A

C3=2
C4=4
CAM=35

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15
Q

Life processes that use energy

A

1-grow
2-maintain
3-repair
4-reproduce

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16
Q

Iteroparity

A

Produces many times over the course of their lives

Not maximizing potential each time

17
Q

Pros and cons of Iteroparity

A
  • you could die young and not reproduce a lot
  • it could be a bad year for reproduction
  • you are gambling that not every year will be a bad year and some offspring will survive
18
Q

Semelparity

A

Single reproductive episode before death
Do 1-3 for a long time then BANG
Ex) agave

19
Q

Pros and cons of one Big Bang

A
  • they could die before they reproduce
  • in a really wet year, you can wash seeds out of the good desert habitat; which would save itself from commentation from annuals; it might end up in a wet location; and desert plants are not adapted for FUNGUS
  • Low probability of loss of entire crop
20
Q

Lots of seeds

A
  • small
  • not very large roots
  • high mortality(not a lot of room for food storage)
  • must germinate quickly
21
Q

Few seeds

A
  • bigger
  • lots of leaves
  • larger roots
  • larger leaves
  • low mortality rate
22
Q

Sonoran desert cacti

A
  • saguaro

- Cardon

23
Q

Saguaro

A
  • In Arizona /more northern
  • increase flowers by increasing ribs
  • higher arms=higher center of gravity
  • roots wrap around big rocks for stability
  • high on the bajada gradient
24
Q

Cardon

A
  • in Mexico /more southern
  • more flowers = more arms
  • lower center of gravity
  • low on the bajada gradient
  • not very frost resistant
25
Q

Plants with C3 photosynthesis

A

Sagebrush

Creosote bush