ET23: core practical and antimicrobial properties of plants and diversity

Question 1

What 4 things to include for every bacterial practical

Answer 1

• prepare an agar plate with a bacterial lawn
  -add extract to paper discs
• incubate 35-38 degrees
• measure diameter and compare zone of inhibition

Question 2

Devise a procedure to investigate the effect of temperature on the growth rate of a monolayer of human cells (5 marks)

Answer 2

• use a waterbath to set temperatures
• control humidity by closing all windows
• provide nutrients for cells
• measure area of cells after two weeks
• culture at each temperature for the same period of time

Question 3

describe what is meant by biodiversity (2 markis)

Answer 3

• the variety of alleles in a gene pool
• number of different species living in one habitat

Question 4

Explore how biodiversity in lemurs in two different parts of Madagascar can be compared (3 marks)

Answer 4

• calculate diversity index
• the higher the index, the greater the biodiversity
• record the number of species of lemur and the number of individuals of each species

Question 5

what is the process of succession?

Answer 5

sequence of species replacing each other with time

Question 6

What needs to be measured to compare the biodiversity of two rainforests?

Answer 6

• measure species richness
• Determine population size

Question 7

Discuss what info needs to be collected before removing a habitat? (4 marks)

Answer 7

• diveristy index
• assess species richness
• measure genetic diversity of species
• account for presence of endemic species