C1.3 Photosynthesis

Question 1

What is photosynthesis?

Answer 1

A process in which plants convert light energy into chemical energy using carbon dioxide and water, releasing oxygen

Question 2

What is the chemical equation for photosynthesis?

Answer 2

6CO2 (carbon dioxide) + 6H2O (water) —> C6H12O6 (glucose) + 6O2 (oxygen)

Question 3

What is the principal energy source in most ecosystems?

Answer 3

The sun

Question 4

Where does photosynthesis occur?

Answer 4

Chloroplast

Question 5

What are the 2 steps in photosynthesis?

Answer 5

1. Light dependent reaction
2. Light independent reaction

Question 6

What is visible light?

Answer 6

A range of electromagnetic waves that we can detect with our eyes

Question 7

What is the shortest wavelength?

Answer 7

Violet

Question 8

What is the longest wavelength?

Answer 8

Red

Question 9

Why do leaves look green?

Answer 9

-they reflect green light + absorb other lights (chlorophyll)

Question 10

Highest rates of photosynthesis occurs at…

Answer 10

Blue and red wavelengths

Question 11

What does an action spectrum have on its axis?

Answer 11

1. Overall rate of photosynthesis
2. Wavelength of light

Question 12

Chloroplast reflects…

Answer 12

Green light

Question 13

Xanthophyll & carotenoids reflect…

Answer 13

Yellow & orange

Question 14

What is the formula for Rf value?

Answer 14

Distance moved by compound / distance moved by solvent

Question 15

Why is thin layer chromatography better than chromatography?

Answer 15

Gives better results —> more defined, well separated spots

Question 16

What is a limiting factor?

Answer 16

A factor that restricts the rate of a reaction when present in a low amount of

Question 17

List some limiting factors

Answer 17

• temperature
• light intensity
• carbon dioxide
• concentration

Question 18

How to measure rate of photosynthesis

Answer 18

Submerged plant- bubble potometer

Question 19

What are the 2 main method for carbon dioxide enrichment experiments?

Answer 19

• enclosed greenhouses
• FACE (free air carbon dioxide enrichment experiments)

Question 20

Where does the light dependent stage take place in?

Answer 20

Thylakoids

Question 21

What are the products made in the light dependent stage?

Answer 21

ATP & reduced NADP

Question 22

Where does the light independent stage take place in?

Answer 22

Stroma

Question 23

Light independent stage = ?

Answer 23

Calvin cycle

Question 24

What is wavelength photosystem 2 most sensitive to?

Answer 24

680 nm

Question 25

What is wavelength photosystem 1 most sensitive to?

Answer 25

700 nm

Question 26

What is photoactivation?

Answer 26

The process by which chlorophyll absorbs light energy and becomes excited leading to a higher energy rate

Question 27

The electrons from ferrodoxin and hydrogen ions from the storms convert NADP to…

Answer 27

Reduced NADP

Question 28

In which photosystem does cyclic photophosphorylation occur?

Answer 28

1

Question 29

in the light dependent stage the reaction is catalyzed by…

Answer 29

Rubisco

Question 30

What are the 3 steps of the Calvin cycle?

Answer 30

1. Carbon fixation
2. Reduction of glycerate-3-phosphate
3. Regeneration of RuBP

Question 31

List some uses of products from the Calvin cycle

Answer 31

• glucose/ starch
• amino acids
• fatty acids
• DNA/ RNA