Chapter 5- Photosynthesis

Question 1

Photosynthesis

Answer 1

Process which collects energy from the sun and brings it into the natural world

Question 2

Plants as photosynthesizers

Answer 2

Once in plants, energy can be transferred to other organisms

Light E — chemical E— high E foods (carbs)

Question 3

Chemical representation

Answer 3

CO2 + H2O + sun= glucose and O2

Question 4

Autotrophs

Answer 4

Self-feeders

Uses inorganic substances (non carbon) to produce organic compounds

All photosynthesizers

Question 5

Heterotrophs

Answer 5

Consumes preexisting organic compounds

Humans/animals

Question 6

Chlorophylls

Answer 6

Mostly in plants cells

Absorb most colors, reflect green

Masks other colors

Question 7

Carotenes

Answer 7

Lesser (accessory) pigments

Absorb violets and blues, reflects red, orange and yellow

Question 8

Mesophyll cells

Answer 8

Where most photosynthesis occurs

Contains lots of chloroplasts

Question 9

Granum

Answer 9

Stacks of discs within the chloroplasts

Question 10

Thylakoids

Answer 10

Each disc in the granum

Question 11

Thylakoids membrane

Answer 11

Pigment molecules embedded here

Proteins embedded here

Question 12

2 stages of photosynthetic reactions

Answer 12

Light dependent

Carbon reactions

Question 13

Light-dependent reaction

Answer 13

Occurs in the thylakoids

Requires sun and H2O

Produces ATP and NADPH

Oxygen in a product

Question 14

Carbon reactions

Answer 14

Doesn’t require light

Uses CO2, ATP and NADPH

Produces glucose (sugar)

Question 15

Photo systems

Answer 15

Part of ETCs that convert light E into ATP and NADPH

I and II both absorb light at the same time.

They become photoexcited and e-‘s are stripped from both and travel one ETC

Lost e-‘s from II produce ATP
Lost e-‘s from I are picked up by NADP+ to produce NADPH

Question 16

Photolysis

Answer 16

Splitting of water into oxygen, H+ and e-‘s

O2 is released

E- replace those lost in PII

Proton gradient

Chemiosmosis

Question 17

Calvin cycle

Answer 17

Carbon Fixation

PGAL synthesis

Reduction

Regeneration

Question 18

Carbon fixation

Answer 18

Carbon fixation-enzymes add CO2 to a 5c molecule-> unstable 6c molecule

Question 19

PGAL synthesis

Answer 19

PGAL synthesis -> uses ATP and NADPH. 3c molecule (PGAL) produced

Question 20

Reduction

Answer 20

1PGAL exists to form glucose, another keeps the cycle going

Question 21

Regeneration

Answer 21

Regeneration of 5c molecule

Starts cycle over