Ecosystems, interdependence and field sampling

An experiment was carried out to investigate the water retention of four different soil mixtures: W, X, Y, and Z.

The results of the experiment are shown below:

Soil mixture	W	X	Y	Z
Initial dry mass of soil / g	200	250	200	400
Volume of water absorbed / $cm3\text{cm}^3$	32	45	18	72
Final mass of wet soil / g	232	295	218	472

Calculate the percentage change in mass for soil mixture X.

[2]

An experiment was carried out to investigate the water retention of four different soil mixtures: W, X, Y, and Z.

The results of the experiment are shown below:

Soil mixture	W	X	Y	Z
Initial dry mass of soil / g	200	250	200	400
Volume of water absorbed / $cm3\text{cm}^3$	32	45	18	72
Final mass of wet soil / g	232	295	218	472

Calculate the percentage change in mass for soil mixture X.

[2]

Ecosystems, interdependence and field sampling Questions