AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) The root grows downward and the shoot grows upward, both responding to gravity.
Geotropism is the directional growth response of a plant to gravity. Roots show positive geotropism (grow towards gravity/downward) and shoots show negative geotropism (grow away from gravity/upward). Option B is correct. Note that this is different from phototropism, which is a response to light, not gravity.
Source: Chapter 6, Section 6.2.2 — "The roots of a plant always grow downwards while the shoots usually grow upwards... in response to the pull of earth or gravity is, obviously, geotropism."