Limiting Factors

Question 1

What are limiting factors

Answer 1

Environmental factors that affect the rate of photosynthesis

Question 2

What is the rate of photosynthesis limited by

Answer 2

Light intensity
Temperature
Level of carbon dioxide
Amount of chlorophyll

Question 3

Describe light as a limiting factor

Answer 3

If there’s plenty, rate of photosynthesis increases (stops if there’s little-no light)

The brighter it is, the faster the rate

On a graph:
- 1. Rate increases as intensity increases
- 2. Rate won’t change due to other limiting factors, graph plateaus

Question 4

Describe temperature as a limiting factor

Answer 4

Affects chemical reactions
As temp rises, rate increases
Enzymes denatured once temperature is too high, rate will fall

On a graph:
Rate Increases as temp increases
Reaches optimum point
Drops after enzymes denatured

Question 5

Describe carbon dioxide concentration as a limiting factor

Answer 5

It’s needed to make glucose
Small amount in atmosphere limits rate
Increased causes increased rate

On a graph:
1. Rate increases as conc increases
2. Plateaus due to other limiting factors

Question 6

Describe chlorophyll levels in leaves as a limiting factor

Answer 6

If there’s less Chloropyll less photosynthesis will take place