Mendel famously used pea plants to study patterns of inheritance over the course of a decade. For quicker investigations pea seeds can be used to study germination, phototropism and plant requirements. Pea seeds are large enough to easily handle, so ideal for younger students, and don't require light to germinate.
50g contains around 40 peas.
Despite the lockdown, my order was delivered promptly. A really personal and friendly service from this company - I will definitely be using them again.