Week 6 Quiz

Question 1

Rubisco

Answer 1

Enzyme that attracts CO2 and O2

Question 2

Consequences of CAM

Answer 2

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

Question 3

Carbons in RuBP

Answer 3

5

Question 4

Costs of C3

Answer 4

Does not function well at high temperatures

Rubisco has a higher affinity for O2 at high temperatures

Question 5

Why most plants use C3

Answer 5

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

Question 6

Pep carboxylase

Answer 6

Virtually no affinity for O2
Used in C4
In mesophyll cells

Question 7

Mesophyll cells

Answer 7

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

Question 8

Bundle sheath cells

Answer 8

Are surrounded by mesophyll cells

Do Calvin cycle

Question 9

CAM photosynthesis

Answer 9

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

Question 10

Pros of limiting Surface area

Answer 10

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

Question 11

C3 costs

Answer 11

Photo respiration at high temperatures

Question 12

C4 costs

Answer 12

ATP intensive

-costs at low temperatures

Question 13

CAMS costs

Answer 13

Low overall photosynthesis rate

Question 14

Grams of carbon fixed/kilo of water lost

Answer 14

C3=2
C4=4
CAM=35

Question 15

Life processes that use energy

Answer 15

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

Question 16

Iteroparity

Answer 16

Produces many times over the course of their lives

Not maximizing potential each time

Question 17

Pros and cons of Iteroparity

Answer 17

• 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

Question 18

Semelparity

Answer 18

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

Question 19

Pros and cons of one Big Bang

Answer 19

• 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

Question 20

Lots of seeds

Answer 20

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

Question 21

Few seeds

Answer 21

• bigger
• lots of leaves
• larger roots
• larger leaves
• low mortality rate

Question 22

Sonoran desert cacti

Answer 22

• saguaro

- Cardon

Question 23

Saguaro

Answer 23

• 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

Question 24

Cardon

Answer 24

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

Question 25

Plants with C3 photosynthesis

Answer 25

Sagebrush

Creosote bush