Biology I H - Chapter 6

Front 1

Living things that use photosynthesis to transform energy into chemical energy

Back 1

autotrophs

Front 2

Plants are _______________

Back 2

photoautotrophs

Front 3

CO2 from air and water from the soil are used to produce _______ _________ (_____)

Back 3

organic compounds (sugar)

Front 4

______ is the by-product released into the air

Back 4

Oxygen

Front 5

Not all autotrophs use ________ as an energy source

Back 5

sunlight

Front 6

_______________ obtain their energy from inorganic molecules rather than the sun

Back 6

Chemoautotrophs

Front 7

3 Stages of Photosynthesis:

Back 7

Stage 1: Light energy is absorbed
Stage 2: Light energy is converted into chemical energy
Stage 3: Carbon fixation – chemical energy and carbon dioxide are used to make carbohydrates

Front 8

Photosynthesis begins when light energy in the form of _______ is absorbed in ____________ of plant cells

Back 8

photons; chloroplasts

Front 9

Plant cells contain ________

Back 9

pigments

Front 10

Chlorophyll, which is found in chloroplasts, contains pigments that reflect _____ _____

Back 10

green light

Front 11

Plants contain 2 other photosynthetic pigment groups in addition to chlorophylls:

Back 11

- Carotenoids
- Phycobilins

Front 12

red, yellow, orange

Back 12

Carotenoids

Front 13

blue (bacteria)

Back 13

Phycobilins

Front 14

When light is absorbed by one cluster of pigment molecules, water molecules are split into ______ _____, ________ ____, and _________

Back 14

oxygen atoms, hydrogen ions, and electrons

Front 15

Pairs of oxygen atoms combine to form ______ ___

Back 15

oxygen gas

Front 16

Some oxygen atoms remain as atoms for use in _____ _

Back 16

stage 3

Front 17

Hydrogen ions remain in the ____________

Back 17

chloroplasts

Front 18

Electrons supply ______

Back 18

energy

Front 19

Carbon dioxide is broken apart during the ______ _____ using energy from stage 2

Back 19

Calvin cycle

Front 20

Chemical energy from stage 2 (electrons) is also used to chemically combine ______ with ________ and ______ _____ to produce _______

Back 20

carbon; hydrogen and oxygen atoms; glucose

Front 21

take place during the day

Back 21

Light Reactions

Front 22

Light energy is trapped in the ____________

Back 22

chloroplasts

Front 23

___ is formed and used to fuel the dark reactions

Back 23

ATP

Front 24

Take place in the afternoons and evenings

Back 24

Dark Reactions

Front 25

Also known as the ______ _____, stage three of photosynthesis

Back 25

Calvin Cycle

Front 26

_____ _________, _____, and ___________ affect the rate of photosynthesis

Back 26

Light intensity, color, and temperature

Front 27

As light intensity increases, photosynthesis _________ to a given point

Back 27

increases

Front 28

Color also affects the rate of photosynthesis:

Back 28

- Violet-blues (highest)
- Red-Orange (next)
- Green (lowest)

Front 29

___________ affects photosynthesis in different ways

Back 29

Temperature

Front 30

In most cases, photosynthesis _________ as temperature increases

Back 30

increases

Front 31

Very high and very low temperature may cause _______ to change shape, interfering with photosynthesis

Back 31

enzymes