Key Area 3: Photosynthesis

Question 1

What is photosynthesis

Answer 1

A process in which green plants make food from raw materials

Question 2

Where does photosynthesis get energy from

Answer 2

Sunlight

Question 3

What is the word equation for photosynthesis

Answer 3

Carbo dioxide + Water -> (light energy + chlorophyll) glucose + oxygen

Question 4

What are the two stages of photosynthesis

Answer 4

1. Light reaction
2. Carbon Fixation

Question 5

Draw light reaction

Answer 5

Light energy
|
Chlorophyll
|
ADP + Pi Chemical Water
| Energy |
ATP. Hydrogen + oxygen

Question 6

Draw Carbon Fixation

Answer 6

H. - ATP -> ADP+Pi
|————————-> Glucose
CO² - Enzyme. (C⁶H¹²O⁶)
Controlled
Reaction

Question 7

How can the glucose produced by photosynthesis be used?

Answer 7

Respiration, make starch, make cellulose

Question 8

Why do plants need energy

Answer 8

For growth

Question 9

Why do plants store glucose as starch

Answer 9

For later use

Question 10

What are plant walls made from

Answer 10

Cellulose

Question 11

What are the three limiting factors in photosythesis

Answer 11

Carbon dioxide concentration
Light intensity
Temperature

Question 12

How can limiting factors be decreased

Answer 12

Supplementary lighting
Paraffin heater

Question 13

What pigment traps light energy?

Answer 13

Chlorophyll

Question 14

What controls Carbon Fixation

Answer 14

Enzymes

Question 15

What is the effect of the limiting factors on photosynthesis?

Answer 15

Limiting factors reduce photosynthesis therefore reduce plant growth