Chapter 7 - Photosynthesis

Question 1

What is photosynthesis?

Answer 1

light energy converted into useable form of chemical energy

Question 2

What is the energy of radiation in the electromagnetic spectrum?

Answer 2

light

Question 3

Why do our eyes view different colors?

Answer 3

protons move in waves of different length

Question 4

What region can our eyes see?

Answer 4

“visible region/light region”

Question 5

What are photons?

Answer 5

light energy particles

Question 6

What is the significance of photon wavelength?

Answer 6

different wavelengths = different energies

Question 7

What are the properties of light?

Answer 7

1. Light begins as a wave
2. Distance between peaks of two consecutive waves in measured as wavelength
3. Colors of light and their properties
   - ->inverse relationship between wavelength and energy
4. Three fates of light
   - ->reflection, absorption, transmission

Question 8

What is absorption?

Answer 8

light energy retained by pigment molecules

*only type for photosynthesis

Question 9

What is reflection?

Answer 9

light energy not retained by pigment molecules so it bounces back for us to see

Question 10

What is transmission?

Answer 10

light energy not absorbed by object but passes through it

Question 11

What are pigments?

Answer 11

molecules that absorb light energy

Question 12

What is Chlorophyll A?

Answer 12

green pigment

most important in photosynthesis

Question 13

What is Chlorophyll B?

Answer 13

accessory pigment

passes off light to Chlorophyll A

Question 14

What do the peaks of wavelengths signify?

Answer 14

places where absorption is happening the best

Question 15

What are accessory pigment’s jobs?

Answer 15

to absorb light that Chlorophyll A can’t absorb

ex. carotine

Question 16

What is the Absorption/Action Spectrum?

Answer 16

what drives photosynthesis the best or the least

Question 17

What does color represent?

Answer 17

the photons that are not absorbed and can be detected by our eyes

Question 18

What is a chloroplast?

Answer 18

site of photosynthesis, double-membrane consisting of granum, thylakoid membrane, an ribosomes

Question 19

What are the steps of the photosynthesis process?

Answer 19

1. Photo-reaction

2. Synthesis-reaction

Question 20

What happens in the photo-reaction?

Answer 20

• with light present
• chlorophyll pigments within internal chloroplast membranes absorb photons. Chlorophyll electrons become excited and begin reactions that create ATP
• split H2O molecules release electrons that replace electrons lost by excited chlorophyll molecules (must always replace)

Question 21

What happens in the synthesis-reaction?

Answer 21

• can occur in dark
• energy from breakdown of ATP (kinetic energy) is used in carbon reactions to fix carbon dioxide into organic sugar molecules (form of stored or potential chemical energy)

Question 22

What is glucose?

Answer 22

carbohydrate product, contains chemical energy converted from sunlight and fixed carbon from atmospheric CO2

Question 23

What is excess glucose stored as?

Answer 23

starch (complex carbohydrate/polymer) –> gets sent to use during cellular respiration (breakdown of glucose into ATP)

Question 24

How is energy conserved in photosynthesis?

Answer 24

converted from kinetic to potential and some heat is released into environment

Question 25

Where do light reactions take place?

Answer 25

thylakoid membrane

Question 26

What colors do we see?

Answer 26

those that are reflected

Question 27

What is the source of oxygen gas released by the light reactions of photosynthesis?

Answer 27

water

Question 28

Where do light reactions take place?

Answer 28

thylakoid membrane