We are trying to grow plants to look at root hairs. We have tried growing mung bean seedlings on tissue paper for a week, but the root hairs were not very visible. Is there is a better plant that we should try?
We suspect that you will have little problem with most seedlings OTHER THAN Mung beans!
Mustard (or Cress as a second choice) work well and one of our team who is a primary teacher had her class ask what the "mould" was that was growing round the roots of Mustard seedlings last week!
The other thing to be aware of is that the atmosphere around the roots must be as humid as possible. You can cover a dish with cling film or germinate the seeds on filter paper in a closed petri dish. They would be best germinated in an incubator (about 25ºC) rather than a sunny windowsill.
You should find that you have root hairs clearly visible in a couple of days.
John Hewitson, Barry Meatyard and Ruth Thomas