3.5 Continued: Photosynthesis Intro

Question 1

What is the simplified photosynthesis formula?

Answer 1

6CO2 + 6H2O + light energy —> C6H12O6 (hexose) + 6O2

Question 2

What are the reactants of ohotosynthesis?

Answer 2

• 6 CO2 and 12 H2O

Question 3

Why is the simplified formula of photosynthesis 6 H2O as reactants, but 12 H2O alone?

Answer 3

• The doubling of H2O input allows for production of diatomic oxygen gas AND excess protons being pumped into lumen via cytochromes for increased H+ gradient
• (when u split H2O, u get one oxygen but oxygen is diatomic)

Question 4

What are the products of photosynthesis?

Answer 4

• C6H12O6
• 6 H2O
• 6 O2

Question 5

What do we track in photosynthesis using the non- simplified formula?

Answer 5

• atoms

Question 6

Phtosynthesis splits __ into _ and _.

Answer 6

• H2O
• H
• O

Question 7

What is a redox reaction?

Answer 7

• reaction involving complete or partial transfer of one or more electrons from one reactant to another

Question 8

How do redox reactions work in photosynthesis?

Answer 8

• the electeons are transferred with H+ (from split H2O) to CO2, reducing it to sugar

Question 9

What are the two stages to photosynthesis?

Answer 9

• light reaction

- calvin cycle

Question 10

What type of energy is light?

Answer 10

• electromagnetic energy

Question 11

Light makes up particles of energy called _____. Light travels in ___.

Answer 11

• photons

- waves

Question 12

What is a wavelength?

Answer 12

• the distance from the crest of one wave to the crest of the next wave

Question 13

What is the entire range of wavelengths called? What is the range for visible light?

Answer 13

• electromagnetic spectrum

- 380 nm to 750 nm is visible light

Question 14

Which has more energy: short or long wavelengths?

Answer 14

• short wavelengths

Question 15

When light reacts with matter, it can be? (3)

Answer 15

• reflected
• transmitted
• absorbed

Question 16

____ are able to absorb visible light

Answer 16

Pigments

Question 17

The color that we can see is the ____ wavelength. Give an example?

Answer 17

• reflected

- leaves r green because chlorophyll absorbs violet blue and red light, so it reflects green

Question 18

What are 2 photosynthetic pigments?

Answer 18

• cholorophyll a

- chlorophyll b

Question 19

What is chlorophyll a? (3)

Answer 19

• primary pigment
• involved in the light reactions
• blue/green pigment

Question 20

What is chlorophyll b?

Answer 20

• accessory pigment

- yellow/green pigment

Question 21

What are carotenoids? What colour is their pigment?

Answer 21

• broaden the spectrum of colours that drive photosynthesis

- yellow/orange pigment

Question 22

What is photoprotection?

Answer 22

• carotenoids absorbs and dissipate excessive light energy that could damage chlorophyll or interact with oxygen