Test

Question 1

Define bioaccumulation

Answer 1

The collection of a substance such as a toxic chemical in various tissues of a living organism at a rate faster then it is metabolised or excreted

Question 2

2 advantages and disadvantages of biological control

Answer 2

Ad: controls the number of pests on crops and doesn’t use any chemicals or cheap
Dis: it’s a slow process and they don’t kill all the pests completely

Question 3

2 advantages and disadvantages of pesticides

Answer 3

Ad: kills insects that damages crops and stops entry transferring from plants to pests
Dis: chemicals can get washed into rivers and lakes and end up in our food chains and in 1960 when DDT got into the food chain and threatened populations of animals

Question 4

2 advantages and disadvantage of battery method

Answer 4

Ad: large number of animals can be reared on a relatively small area of land and the quantity and quality of food for example cereal eaten by the animals can be better controlled
Dis: increased risk of disease poor quality of product e.g eggs

Question 5

2 advantages and disadvantages of fertilisers

Answer 5

Ad: fertilisers put more nutrients into the soil. This enables farmers to produce more crops in a smaller area of land
Dis: risk of environment pollution. Damage the natural balance of nutrients in the soil