Chapter 8, Photosynthesis

Question 1

Photosynthesis is the conversion of ______ energy to _______ energy

Answer 1

light, chemical

Question 2

Heterotrophs

Answer 2

organisms which cannot make own food from simple carbon compounds

Question 3

Autotrophs

Answer 3

organisms which can make own food from simple carbon compounds

Question 4

Parts/Structures of Photosynthesis

Answer 4

• Plants parts
• basic reactants and products
• light
• pigments
• photosystems

Question 5

Reactants of photosynthesis

Answer 5

carbon dioxide, water, light (energy)

Question 6

Products of photosynthesis

Answer 6

Food (carbohydrates), oxygen

Question 7

Formula for photosynthesis

Answer 7

H2O+CO2–> C6H12O6 + O2

Question 8

Water diffuses into plant through _____, travels up stem to the leaves, through the ______ in the vascular bundles

Answer 8

roots, Xylem

Question 9

CO2 enters plants through microscopic pores called

Answer 9

stomata

Question 10

Stomata located

Answer 10

on underside of leaves

Question 11

Carbon dioxide and water enters plants through

Answer 11

diffusion

Question 12

Light comes in particles termed _______

Answer 12

photons

Question 13

Light also travels in ______

Answer 13

waves

Question 14

Wavelength is

Answer 14

the distance from one wave peak to the next

Question 15

Electromagnetic Radiation is

Answer 15

all forms of radiant energy, including visible light

Question 16

Relationship between wavelength and energy is

Answer 16

inverse

Question 17

the _______ wavelengths have _____ energy

Answer 17

longer, less shorter, more

Question 18

Visible light spectrum ranges from

Answer 18

400-700 nm

Question 19

White light composed of…

Answer 19

all the visible light, all colors

Question 20

Pigments are

Answer 20

molecules that can absorb some wavelength but nor others

Question 21

How to pigments how color

Answer 21

Wavelength that are not absorbed are reflected (transmitted) so they can be seen

Question 22

An action spectrum is

Answer 22

a graph for entire plant, plotting photosynthetic activity (action) vs wavelength

Question 23

One can determine which of many pigments in a plant are the major ones for photosynthesis by

Answer 23

comparing absorption spectrum of each pigment with action spectrum

Question 24

Plant does __________ with the light absorbed

Answer 24

photosynthesis

Question 25

Chlorophyll is hydro________

Answer 25

hydrophobic

Question 26

___________ tail insert chlorophyll into the __________ membrane

Answer 26

hydrocarbon, thylakoid

Question 27

The head of chlorophyll has alternating ______ and _____ bonds

Answer 27

double, single

Question 28

These double and single bonds useful for

Answer 28

picking up and giving off extra electrons

Question 29

Chlorophyll a and b only differ in

Answer 29

one functional group

Question 30

There is a _____ group in chlorophyll a, and a _______ group in chlorophyll b

Answer 30

Carboxyl (COH) in a, and a Methyl (CH3) in b

Question 31

Photosystems are

Answer 31

clusters of pigments

Question 32

Photosystems contain the pigments

Answer 32

chlorophyll a and b, and some xanthophyll and carotene

Question 33

Photosystems can have ____-____ pigments

Answer 33

250-400

Question 34

Photosystems arranged so that light energy is passed from pigments that absorb ____ wavelength to those that absorb ______ wavelengths

Answer 34

shorter to longer

Question 35

There is a special pair of Chlorophyll ___ molecules the ultimately...

Answer 35

chlorophyll A, receive the energy/electrons from all other pigments, pass the actual electrons not just energy

Question 36

Photosystem I, chlorophyll a is _____

Answer 36

P700

Question 37

Photosystem II, chlorophyll a is ____

Answer 37

P680

Question 38

The numbers P700/P680 refers to

Answer 38

optimal absorption

Question 39

Chlorophyll a in Photosystems 1 and 2 pass high energy electrons to...

Answer 39

molecules outside the photosystem

Question 40

2 types of photosynthetic reactions

Answer 40

- energy-transduction reaction - carbon-fixation reactions

Question 41

Energy transduction reactions are also called.....and they are involved with...

Answer 41

light reactions/light dependent reactions energy transfer

Question 42

carbon fixed reaction are also called...involved with...

Answer 42

dark reactions/light independent reactions CO2 fixed, enzymatically combined with, covalently bonded to RuBP

Question 43

Photolysis is when

Answer 43

water molecules get split, produces 2 electrons, 2H+, and 1/2 H2O

Question 44

Step 1 on light dependent reaction

Answer 44

noncyclic Photophosphorylation energy/electron transfer --> NADPH

Question 45

Step 2 in light dependent reaction

Answer 45

Photolysis splitting water

Question 46

Step 3 in light dependent reaction

Answer 46

chemiosmosis making ATP

Question 47

Step 4 in light dependent reaction

Answer 47

Cyclic Photophosphorylation energy/electron transfer

Question 48

**study steps in photosystem 1