Ecological Diversity and Simpson's Index

Dr. Demi explains how to calculate Simpson's Index of Diversity, a key concept in A-level biology. The video covers the formula, its parameters, and provides examples from textbooks and exam papers. Dr. Demi emphasizes the importance of understanding the formula and offers tips for exam success.

What is the primary purpose of calculating Simpson's Index of Diversity in ecological studies?

• To calculate the average size of species in a habitat

• To measure the abundance of a single species

• To assess the diversity of species within a community

• To determine the total number of species in an area

In the formula for Simpson's Index of Diversity, what does the small 'n' represent?

• The total area surveyed

• The average number of species

• The number of individuals of a particular species

• The total number of species

What should you do if your calculated Simpson's Index of Diversity is greater than 1?

• Accept the result as it is

• Increase the sample size

• Recalculate as there is an error

• Decrease the sample size

When comparing two regions using Simpson's Index of Diversity, which region is more diverse?

• The one with a lower index value

• The one with fewer species

• The one with more species

• The one with a higher index value

In the example calculation, what is the significance of keeping values to three decimal places?

• It ensures accuracy in the final result

• It reduces the number of calculations needed

• It simplifies the calculation process

• It is a requirement by CIE

What is the null hypothesis when comparing beetle diversity in grazed and ungrazed lands?

• There is a significant difference in diversity

• There is no significant difference in diversity

• Ungrazed land has more diversity

• Grazed land has more diversity

How many genera of beetles were identified in the sample exam question?

• One

• Two

• Three

• Four

What was the calculated Simpson's Index of Diversity for beetles on grazed land?

• 0.228

• 0.521

• 0.201

• 0.799

What impact does grazing have on the diversity of dung beetles according to the video?

• Grazing decreases diversity

• Grazing has no impact on diversity

• Grazing increases diversity

• Grazing only affects certain species

What advice does Dr. Demi give for exam preparation at the end of the video?

• Ignore past exam papers

• Collaborate with peers for better learning

• Rely only on video tutorials

• Focus solely on textbook examples