Chapter 6: Where It Starts- Photosynthesis

Question 1

In photosynthesis, plants and other autotrophs (producers) use __________ to build sugars from _______ and _____.

Answer 1

Sunlight
Water
CO2

Question 2

____________ make food using energy from environment and carbon from inorganic molecules

Answer 2

Autotrophs (producers)

Question 3

_______________ obtain carbon from organic compounds assembled by other organisms

Answer 3

Heterotrophs (consumers)

Question 4

Light is electromagnetic radiation that moves through space as _______ organized as massless particles of energy called _________.

Answer 4

Waves

Photons

Question 5

________ ________ represents a small part of the spectrum, but is the main form of energy that drives photosynthesis

Answer 5

Visible light

Question 6

Molecules that absorb light of specific wavelengths

Answer 6

Pigments

Question 7

____________ __ is the most common photosynthetic pigment in plants and protists

Answer 7

Chlorophyll a

Question 8

___________ __________ are involved in photosynthesis, but also serve additional purposes such as being an antioxidant and attracting animals with their color

Answer 8

Accessory pigments

Question 9

What are the 3 steps in how a pigment works?

Answer 9

1. Absorb photons and electrons are boosted to higher energy level temporarily
2. Energy is released when electrons return to lower energy level
3. Released energy is captured by photosynthetic cells, which transform light energy into chemical bond energy

Question 10

Why do leaves change color in the fall?

Answer 10

When plants stop making pigments in preparation for winter, leaves change color because chlorophyll breaks down faster than other colored pigments

Question 11

What two colors of light drive photosynthesis according to Theodor Engelmann’s experiment?

Answer 11

Blue and red

Question 12

Illustrates that different pigments absorb different wavelengths of light

Answer 12

absorption spectra

Question 13

Sunlight energy must be converted from light energy into _________ ______ _______ energy, which can be stored for use at a later time

Answer 13

Chemical bond energy

Question 14

In plants, photosynthesis takes place in which cell organelle?

Answer 14

Chloroplasts

Question 15

What are the 3 parts of a chloroplast and what purpose does each part serve?

Answer 15

• 2 Outer Membranes
  •enclose stroma

-Thykaloid Membrane
• converts light energy to ATP and NADPH

• Stroma
  • where ATP & NADPH drive synthesis of sugars

Question 16

What is the formula for photosynthesis?

Answer 16

Carbon dioxide + water + light energy –> glucose + oxygen

Question 17

Occur in Thykaloid membrane; converts light energy to ATP and NADPH

Answer 17

Light-dependent reactions

Question 18

Occur in the stroma; ATP and NADPH drive synthesis of sugars from water and CO2

Answer 18

Light-independent reactions

Question 19

What are the inputs and outputs of light-dependent reactions?

Answer 19

Inputs:
•ADP
•NADP+
•H2O
•energy

Outputs:
•ATP
•NADPH
•O2

Question 20

What are the inputs and outputs of light independent reactions (Calvin-Benson cycle)

Answer 20

Inputs:
•ATP 
•NADPH
•CO2
•H2O

Outputs:
•ADP
•NADP+
•sugars

Question 21

Light is electromagnetic radiation that moves through space as _______ organized as massless particles of energy called _________.

Answer 21

Waves

Photons

Question 22

________ ________ represents a small part of the spectrum, but is the main form of energy that drives photosynthesis

Answer 22

Visible light

Question 23

Molecules that absorb light of specific wavelengths

Answer 23

Pigments

Question 24

____________ __ is the most common photosynthetic pigment in plants and protists

Answer 24

Chlorophyll a

Question 25

___________ __________ are involved in photosynthesis, but also serve additional purposes such as being an antioxidant and attracting animals with their color

Answer 25

Accessory pigments

Question 26

What are the 3 steps in how a pigment works?

Answer 26

1. Absorb photons and electrons are boosted to higher energy level temporarily
2. Energy is released when electrons return to lower energy level
3. Released energy is captured by photosynthetic cells, which transform light energy into chemical bond energy

Question 27

Light is electromagnetic radiation that moves through space as _______ organized as massless particles of energy called _________.

Answer 27

Waves

Photons

Question 28

________ ________ represents a small part of the spectrum, but is the main form of energy that drives photosynthesis

Answer 28

Visible light

Question 29

Molecules that absorb light of specific wavelengths

Answer 29

Pigments

Question 30

____________ __ is the most common photosynthetic pigment in plants and protists

Answer 30

Chlorophyll a

Question 31

___________ __________ are involved in photosynthesis, but also serve additional purposes such as being an antioxidant and attracting animals with their color

Answer 31

Accessory pigments

Question 32

What are the 3 steps in how a pigment works?

Answer 32

1. Absorb photons and electrons are boosted to higher energy level temporarily
2. Energy is released when electrons return to lower energy level
3. Released energy is captured by photosynthetic cells, which transform light energy into chemical bond energy