Chapter 10 Photosynthesis

Question 1

autotroph vs. heterotrophs

Answer 1

auto- make their own food
hetero- consumers organic molecules

Question 2

explain how Photosynthesis is different from cellular respiration

Question 3

In what way do ecosystems depend on photosynthesis.

Answer 3

O2, food

Question 4

What is the overall reaction that summarizes the process of photosynthesis?

Answer 4

C02+Light+H2O –> C6H12O6+O2

Question 5

How does it compare with the overall reaction summarizing cellular respiration?

Answer 5

they’re opposite reactions and products

Question 6

What is light?

Answer 6

solar energy

Question 7

What property of light do we perceive when we see different colors?

Answer 7

wavelength

Question 8

How is energy related to wavelength?

Answer 8

the smaller the wavelength the more energy

Question 9

What are pigments?

Answer 9

give colors we can see

Question 10

What are photo-sensitive pigments?

Answer 10

absorb light

Question 11

What molecules act as pigments in the light-dependent reactions of photosynthesis

Answer 11

chlorophyll

Question 12

Where does the light-dependent reaction (the “photo” reaction) of photosynthesis occur?

Answer 12

thylakoid membranes of chloroplast

Question 13

Describe what happens when the photosystem pigments absorb light energy.

Answer 13

they get excited, creating energy and release an electron to an electronic acccpetor

Question 14

At what point does the light energy absorbed produce a chemical change?

Answer 14

when H2O get split to release O2 and an e- that goes back into the chlorophyll

Question 15

Explain how photosystem II differs from photosystem I.

Answer 15

photosynthesis ll is the water splitting system while photosystem l NAD+ to NADPH

Question 16

How are the two photosystems interconnected?

Answer 16

they’re interconnect through the ETC through a series of redox reactions

Question 17

What replaces the electrons lost by the reaction center chlorophylls in each of
the two photosystems?

Answer 17

PSl; H2O
PSll: the electrons passing along the ETC

Question 18

What are the products of the light-dependent reactions?

Answer 18

ATP (energy) and NADPH (reducing power for Calvin cycle), O2

Question 19

What molecule picks up the electrons from the light reactions, and where are the lost electrons taken?

Answer 19

NAD+ which turns to NADPH lost electrons are taken to the calvin cycle

Question 20

Where does the Calvin Cycle (the “synthesis” reaction) occur?

Answer 20

Stroma

Question 21

What does the Calvin Cycle create?

Answer 21

G3P and glucose

Question 22

Describe the process.

Question 23

What is Rubisco, and what does it do?

Answer 23

carbon fixation

Question 24

Compare C3, C4, and CAM plants.

Question 25

Where would you expect to find each type of plant?

Question 26

How might climate change affect the numbers of C3, C4, and CAM plants?

Question 27

What do the products of the light reactions contribute to the Calvin cycle

Answer 27

ATP and NADPH

Question 28

Does the Calvin cycle utilize or generate ATP

Answer 28

utilizes