Assertion : Ginger has a prostrate-growing rhizome. Reason : Shoot growth is not effected by gravity.

Rhizome is normally a prostrate, thickened stem, creeping horizontally under the surface of the soil. The common example is ginger. It is provided with distinct node and long or short internode. It bears some scaly leaves at the nodes, possesses a bud in the axil of the scaly leaf and ends in a terminal bud. The response of plant to wards gravity is called geotropism. The roots are positively geotropic and grow downwards, while the shoot is negatively geotropic and grows away from the gravitational pull from the centre of earth. Parts which show no effect of gravity are called ageotropic.