Photosynthesis

Question 1

What 3 things are needed for photosynthesis t occur?

Answer 1

light, carbon dioxide, water

Question 2

What 2 things are produced during photosynthesis?

Answer 2

oxygen, glucose

Question 3

What are the two main steps of photosynthesis

Answer 3

1. light reactions, 2. calvin cycle (light independent reactions)

Question 4

What is an autotroph?

Answer 4

a producer, an organism that makes its own food

Question 5

What is a heterotroph?

Answer 5

a consumer, an organism that must consume food to get its organic compounds

Question 6

What is a carnivore?

Answer 6

A consumer that eats only meat

Question 7

What is an omnivore

Answer 7

A consumer that eats both meat and plants

Question 8

What is a herbivore?

Answer 8

A consumer that eats plants

Question 9

What are the reactants of photosynthesis?

Answer 9

water, carbon dioxide and light

Question 10

What are the products of photosynthesis?

Answer 10

oxygen and glucose

Question 11

What is a pigment?

Answer 11

a molecule that absorbs and reflects light?

Question 12

Where does photosynthesis occur in a plant cell?

Answer 12

in the chloroplast

Question 13

What are ATP and NADPH?

Answer 13

energy carrying molecules

Question 14

What powers the light reactions?

Answer 14

sunlight

Question 15

What powers the calvin cycle?

Answer 15

ATP and NADPH, chemical energy

Question 16

Where do the light reactions take place?

Answer 16

the thlyakoids

Question 17

Where does the Calvin Cycle occur?

Answer 17

the stroma

Question 18

How does carbon dioxide and oxygen get into a leaf?

Answer 18

tiny holes called stomata

Question 19

What are the 3 main pigments in plants?

Answer 19

chlorophyll a, chlorophyll b, carotenoids

Question 20

What is the goal of the light reactions?

Answer 20

to recharge ATP and NADPH so they can be used to power the calvin cycle

Question 21

What is a by-product of the light reactions?

Answer 21

oxygen

Question 22

Where do the electrons come from to pump H+ and to re-energize NADPH during the light reactions?

Answer 22

water (H2O)

Question 23

What does oxidation mean?

Answer 23

losing electrons (LEO says GER)

Question 24

What does reduction mean?

Answer 24

gaining electrons (LEO says GER)

Question 25

In what directions are H+ ions pumped through the thylakoid membrane?

Answer 25

from the stroma to the thylakoid space

Question 26

What is a photosystem?

Answer 26

a cluster of pigment molecules that absorbs light energy

Question 27

What is happening in a photosystem?

Answer 27

light is being absorbed and is used to excite (energize) electrons. The electrons get passed to the reaction center, which passes them off to the primary electron acceptor which passes them to a protein in the electron transport chain

Question 28

Which pigment makes up the reaction center?

Answer 28

chlorophyll a

Question 29

What is the goal of the calvin cycle?

Answer 29

to use CO2 and the energy from the light reactions, ATP and NADPH to make sugar

Question 30

What happens to the ATP and NADPH that go into the calvin cycle?

Answer 30

they lose energy and are sent back to the light reactions to get recharged.

Question 31

How do you recharge ADP?

Answer 31

Add a phosphate (and bond) to it.

Question 32

How do you recharge NADP+?

Answer 32

Add H+ and e- to it