Genetic diversity

Question 1

Suggest and explain 3 advantages and 2 disadvantage to a farmer of replanting hedges on her farmland.

Answer 1

Advantage -
1. Greater biodiversity so increase in predators of pests so more income as less damage to crops
2. Increase in pollinators so more yield/income
3. May attract more tourists to their farm so more
income
Disadvantage -
1. Reduced land area for crop growth/income
2. Greater biodiversity so increase pest population so less yield/less income

Question 2

The index of diversity of the insects was higher in the hedge than in the barley field. Suggest why.

Answer 2

1. More plant species
2. More food sources
3. More habitats

Question 3

Describe how he made a 1 in 10 dilution and then used this to make a 1 in
1000 dilution of the original liquid culture of bacteria

Answer 3

1. Add 1 part culture to 9 parts liquid to make 10–1
   dilution
2. Mix well
3. Add 1 part 10–1 to 99 parts liquid to make 10–3
   dilution