Fertilisers And Biological Control

Question 1

What is biological control?

Answer 1

Using organisms to control pests/weeds

eg: Using predatory ants to remove insects from crops and reducing their yield

Question 2

What are fertilisers used for?

Answer 2

Increasing the growth and yield of crop plants

Question 3

What do fertilisers contain that help plants grow? Explain.

Answer 3

Mineral salts - naturally occurring compounds in rocks and soils

• Plants need these ions to make more healthy cells, to grow well

Question 4

What is a drawback of using fertilisers?

Answer 4

If not absorbed fully by a crop, it may get into nearby streams, rivers and lakes.

POLLUTION
-Death of organisms, health problems for human and animals, if used for drinking.