CH 5 Energy

Question 1

Does A or B represent the absorbance spectra for chlorophyl a?

Answer 1

A

Question 2

In the CAM pathway does CO₂ uptake occur during the day or the night?

Answer 2

The night

Question 3

In the CAM pathway does Calvin Cycle occur during the day or the night?

Answer 3

during the day

Question 4

How does a chemosynthesizer get energy

Answer 4

They get energy from inorganic matter without the presence of light

Question 5

What is physoilogically happening at the light compensation point for a photoautotroph?

Answer 5

There is a balance between the CO₂ uptake from photosynthesis and the CO₂ output from respiration

Question 6

What is the net photosynthetic rate

Answer 6

The amount of photosynthesis after respiration

Question 7

What is the gross photosynthetic rate

Answer 7

The amount of photosynthesis and respiration combined

Question 8

How does the color of leaves in a forest relate to their height above ground?

Answer 8

Lighter green leaves at the top of canopies synthesize less chlorphyll

Darker green leaves toward the shrub layer synthesize more chloropyll to “scavenge” for available light

Question 9

Are high light leaves thick or thin? Broad or less broad?

Answer 9

High light leaves and thick and less broad

Question 10

Are low light leaves thick or thin? Broad or less broad?

Answer 10

Low light leaves are thin but more broad

Question 11

Is the carboxylase reaction catalyzed by rubisco energy consuming or energy producing?

Answer 11

energy producing

Question 12

Is the oxygenase reaction catalyzed by rubisco energy consuming or energy producing?

Answer 12

energy consuming

Question 13

If the CO₂:O₂ ratio favors oxygen, will Rubisco favor photosynthesis or photorespiration?

Answer 13

photorespiration

Question 14

When is photorespiration favored?

High or Low temp?

High or Low CO₂:O₂ ratio?

Answer 14

High temp, Low CO₂:O₂ ratio

Question 15

When is photosynthesis favored?

High or Low temp?

High or Low CO₂:O₂ ratio?

Answer 15

Low temp, High CO₂:O₂ ratio

Question 16

What conditions are advantageous for C4 or CAM photosynthesis?

Answer 16

Dry, hot conditions, low water availability

Question 17

define Osmotroph

Answer 17

osmotrophs get nutrients by absorbing dissovled oragnic matter from their surroundings

Question 18

define Detritivore

Answer 18

consumes dead or decaying matter

Question 19

describe C3 photosynthesis

Answer 19

the first carbon compound that is produced is a 3-C compound.

Not able to regulate CO₂:O₂ ratios well.

Costs 2 fewer ATP per Calvin Cycle compared to C4

Question 20

describe C4 photosynthesis

Answer 20

4-C compound created in the mesophyll cell. the 4-C compound is delivered to the byndle sheath cell where the Calvin cycle occurs. Then the left over 3-C compound is recycled back to the mesophyll cell

Question 21

describe CAM photosynthesis

Answer 21

temporal separation of reactions

a 4-C compound is made and stored in the night and during the day the stomata close to prevent excess water loss. The stored 4-C compounds are used during the day for the Calvin Cycle

Question 22

Which light response curve represents a high light plant, low light plant, and medium light plant?

Answer 22

A = High light plant

B = Medium light plant

C = Low light plant