"Potato is a stem and sweet potato is a root." Justify the statement.

Potato and sweet potato:

Frogs are beneficial to mankind . Justify the statement .

State wherther potato is stem or root.

Physics is an exciting science. Justify the statement.

Rhizome of ginger is like the roots of other plants that grows underground. Despite this fact ginger is a stem and not a root. Justify.

Aakash bought vegetables weighing 10 kg.Out of this 3 kg 500 g is onions,2 kg 75 g is tomatoes and the rest is potatoes .What is the weight of the potatoes?