Photosynthesis - Ch. 7

Question 1

What is the overall reaction for photosynthesis?

Answer 1

6CO2 (carbon dioxide) + 6H20 (water) + light energy —> C6H12O6 (glucose) + 6O2 (oxygen)

Question 2

During photosynthesis, plants take in _____ and give off ______

Answer 2

Carbon Dioxide, Oxygen

Question 3

During photosynthesis, gasses are exchanged through openings in the leaf called the ______

Answer 3

stomata

Question 4

Where in the cell plant does photosynthesis occur?

Answer 4

Chloroplast. Light Reactions occur in the thylakoid membrane. Calvin Cycle occurs in the stroma.

Question 5

What 3 end products are made during the Light Dependent Reactions?

Answer 5

Oxygen, ATP, NADPH

Question 6

What happens during the Light Dependent Reactions?

Answer 6

Solar energy is converted into chemical energy.

Water is split, oxygen is released.

Question 7

What is the photosystem?

Answer 7

It is like a light-gathering antenna. Contains cluster of pigment molecules, a reaction center, and primary electron acceptor.

Question 8

What are the steps for the flow of electrons during the Light Dependent Reactions?

Answer 8

1. Water is split, making e-, H+, O2
2. Electrons go to Water Splitting Photosystem
3. Sun boots energy of electrons from low to high
4. Proteins in ETC accept electrons and pass them down ETC
5. Electrons go to NADPH Producing Photosystem
6. Sun boosts energy of electrons from low to high again
7. Protein of ETC accepts and passes them down ETC again
8. NADP+ accepts electrons to become NADPH

Question 9

What is one of the byproducts of the Light Dependent Reactions that will no longer be used in photosynthesis?

Answer 9

Oxygen

Question 10

Thylakoid Membrane

Answer 10

The photosynthetic membrane within a chloroplast that contains light gathering pigment molecules and electron transport chains

Question 11

Grana/Granum

Answer 11

Stack of thylakoids

Question 12

Light-dependent reactions

Answer 12

reactions of photosynthesis that use energy from light to produce ATP and NADPH

Question 13

Chlorophyll

Answer 13

Light-absorbing green-colored pigment that begins the process of photosynthesis

Question 14

Is photosynthesis an endergonic reaction?

Answer 14

Yes– it takes in energy.

Question 15

Short wavelengths have…

Answer 15

high energy

Question 16

Sunlight energy is also called…

Answer 16

electromagnetic energy

Question 17

What are the reactants for photosynthesis?

Answer 17

light, carbon dioxide, and water

Question 18

Carotenoids

Answer 18

A type of pigment in plants that absorb violet/blue-green light. They appear yellow/red/orange, like in autumn.

Question 19

What gas is needed for Light Independent Reactions (Calvin Cycle)?

Answer 19

Carbon Dioxide (CO2)

Question 20

What 2 products from the Light Dependent Reactions are needed for the Calvin Cycle?

Answer 20

ATP and NADPH. They are needed to convert 3-carbon molecules to G3P.

Question 21

What are the inputs and outputs of the Calvin Cycle?

Answer 21

Inputs: CO2, ATP, NADPH
Outputs: one G3P, which can make glucose and other products (like starch)

Question 22

What is the enzyme that attaches CO2 to RuBP (a 5-carbon sugar)?

Answer 22

Rubisco

Question 23

What are all the steps of the Calvin Cycle?

Answer 23

1. Enzyme adds CO2 to 5-carbon sugar, RuBP. The molecule then breaks into two 3-Carbon molecules.
2. Using ATP and NADPH from the light reactions, enzymes convert the 3-carbon molecules to 3-carbon sugar known as G3P
3. For every 3 molecules of CO2 that enter the cycle, the net output is one G3P sugar. The other G3P sugars continue in the cycle.
4. Enzymes rearrange the remaining G3P sugars to regenerate RuBP. Cycle turns again.