Key area 3- Photosynthesis

Question 1

What are the two stages of photosynthesis called?

Answer 1

Light reactions and Carbon fixation

Question 2

Function of chlorophyll

Answer 2

A chemical found in the chloroplasts that is able to trap light energy

Question 3

Where is chlorophyll found?

Answer 3

Chloroplast

Question 4

What is ATP?

Answer 4

A form of chemical energy

Question 5

What is the first stage of photosynthesis called?

Answer 5

Light reactions

Question 6

What is the second stage of photosynthesis called?

Answer 6

Carbon fixation

Question 7

What is cellulose?

Answer 7

Sugar that has been converted into cellulose that can be used for structural uses (e.g. structure of a cell wall)

Question 8

What is a limiting factor?

Answer 8

A factor or substance that prevents a chemical reaction from happening quicker

Question 9

What is sugar converted into for storage?

Answer 9

Starch

Question 10

Describe what happens in the stage light reactions

Answer 10

Light energy is trapped in the chloroplasts, some light energy is converted into ATP, remaining light energy is used to split water into hydrogen and oxygen, oxygen then diffuses from the cell

Question 11

Describe what happens in the stage carbon fixation

Answer 11

ATP and hydrogen from light reactions and carbon dioxide from the air combine, converted into sugar during a series of enzyme controlled reactions

Question 12

What are the 3 uses of sugar made by photosynthesis?

Answer 12

Respiration, Storage as starch, Structural as cellulose

Question 13

What are the 3 limiting factors that affect photosynthesis?

Answer 13

Temperature, Light intensity, Carbon dioxide CONCENTRATION