In molecular biology and biotechnology, a microcentrifuge is one such item of equipment. The centrifuge is simple, robust and has been thoroughly tested to ensure that it is safe. There is more information in Osmosis 15 and use this link to find out more about the centrifuge on NCBE's site. Return to Top of Page Ideas for investigations with mosses All plants need water, but some plants can survive without water for long periods. Mosses like G. pulvinata commonly grow in very dry places, e.g. on roofs and walls, where there is no soil.
Most land plants have roots which perform several functions.
The roots hold the plant in place and they also absorb water and mineral nutrients. Collect a clump of moss. Make sure that there is no soil or other debris attached to it. Weigh the dried moss. Continue drying and reweighing until two successive readings are identical.