Food production test questions

1

Which term describes the loss of fertiliser chemicals as water moves through soil?

2

What effect can leached fertiliser have on fresh water?

3

What can cause algal blooms?

4

Weeds compete with crop plants for nutrients, water and light. How can farmers reduce this competition for resources?

5

A pesticide accumulates in the bodies of organisms in the food chain shown below.

Food chain: at the bottom are algae, which are consumed by mayfly nymphs. The mayfly nymphs are consumed by sunfish which in turn are eaten by the great blue heron.

In which organism will the highest concentration of the pesticide be found?

6

What happens to the toxicity of a pesticide in the bodies of organisms at higher levels in a food chain?

7

What do plants use nitrate for?

8

Which term describes an organism of one species that can be used to reduce the population size of another species?

9

Which chemical must be inserted into a crop plant to genetically modify it?

10

Which of the following characteristics of a genetically modified crop plant would reduce the need to give it large quantities of fertiliser?