C2:11+

Question 0

How do fertilisers increase crop yield?

Answer 0

By replacing essential elements from previous crop or provide new extra elements.
The provided nitrogens gets incorporated in to plant protein so that it can increase growth.

Question 1

Give the four main points on fertilisers.

Answer 1

Used to increase crop yield;
Dissolve in water so that it can be absorbed by the plants roots;
They are needed because of the high demand of food in the rising population;
They can pollute water supplies

Question 2

Explain eutrophication.

Answer 2

1) The fertilisers get washed from the fields into ponds, lakes and rivers.
2) They provide nutrients to the algae on top.
3) The algae grows quickly and blocks off the sunlight from oxygen producing plants in the water.
4) These plants die
5) Aerobic bacteria then decomposes the dead and decaying plants and take in all the oxygen.
6) Most of the living organisms then die