I remember doing this project in school - we'd lined a glass jar with cotton, and placed seeds between the glass and the cotton, and moistened it everyday. Great way to see how a seed grows into a plant. Puttachi and I had started this last week. We got back after 4 days in Mysore, and to our surprise, the shoots have, well, shot up!
Check out the roots! This one is Rajma.
It took just about a week to ten days for the plants to grow so much from seed. We'd "planted" rajma, white peas, moong beans (hesarukaalu) and black chickpeas. The fat stalk is the rajma plant, and the one with the tiny delicate leaves is moong.
If you haven't done this with your children already, do it! It is a great way for them (and us!) to observe the sprouting, and the development of shoots and roots.