CH 7 Photosynthesis

Question 1

photosynthesis main points

Answer 1

• used by plants, algae, and some bacteria
• transforms light energy into chemical energy
• uses carbon dioxide and water as starting reactants
• produces glucose and oxygen

Question 2

organisms that use photosynthesis are

Answer 2

• photosynthetic autotrophs and

- the producers for most ecosystems

Question 3

chloroplasts are

Answer 3

• the site of photosynthesis

- found mostly in the interior cells of leaves

Question 4

parts of the chloroplast

Answer 4

• thylakoids
• stroma
• grana

Question 5

chlorophyll

Answer 5

• adds green color to plants

- a light-absorbing pigment that plays a central role in converting solar energy to chemical energy

Question 6

stomata

Answer 6

tiny pores in leaves

• carbon dioxide enters
• oxygen exits

Question 7

two steps of photosynthesis

Answer 7

1. light reactions

2. calvin cycle

Question 8

light reactions

Answer 8

convert solar energy into chemical energy

Question 9

calvin cycle

Answer 9

uses the products of the light reactions to make sugar from carbon dioxide

Question 10

carbon fixation

Answer 10

the initial incorporation of carbon from the atmosphere into organic compounds
-lowers the amount of carbon in the air

Question 11

wavelength

Answer 11

the distance between the crests of two adjacent waves

Question 12

photosynthesis uses wavelengths in the visible spectrum

Answer 12

• wavelengths of light that we see as colors

- plants absorb most colors, but reflect green

Question 13

fall colors

Answer 13

• the most abundant pigments in plants are usually green chlorophylls
• when leaves are getting ready to fall, the green chlorophylls are removed from the leaves
• pigments that remain are less abundant (red, yellow, orange)