Lamarck & Darwin

Question 0

What was lamarck’s theory?

Answer 0

• Individual organisms can change over their lifetime to become better adapted to their environment
• They lose characteristics they don’t use and develop those that are
• Organisms pass these to offspring
• Over generations causes evolution

Question 1

What were lamarck’s observations?

Answer 1

• Many organisms are well adapted to their environment
• Individuals can develop useful characteristics due to ‘inner need’
• Characteristics can then be passed on from one generation to the next

Question 2

What was Darwin’s theory based on?

Answer 2

3 facts and 2 conclusions

Question 3

Fact 1:

Answer 3

All organisms over-reproduce

Question 4

Fact 2:

Answer 4

Despite over-reproduction the number of organisms of each species remains stable as a result of competition for resources

Question 5

Conclusion 1:

Answer 5

Continuous competition between individuals for environmental resources creates a ‘struggle for existence’

Question 6

Fact 3:

Answer 6

There is variation of detail between the members of a species

Question 7

Conclusion 2:

Answer 7

Some individuals with particular variations will be more suited to survive and reproduce