Concept:The upward growth of plant shoots in response to gravity is called negative geotropism.
Explanation:Tropism is the growth movement of a plant in response to an external stimulus.
If the movement is toward the stimulus, it is called positive tropism.
If the movement is away from the stimulus, it is called negative tropism.
The shoot of a plant grows upward, which is away from the pull of gravity.
Since gravity pulls downward, growing upward means moving away from the gravity stimulus.
This type of response to gravity is called geotropism.
Therefore, upward movement of shoots is negative geotropism.
Roots, on the other hand, grow downward and show positive geotropism.
Other tropisms include phototropism (response to light), chemotropism (response to chemicals), and hydrotropism (response to water).
In phototropism, stems usually grow toward light (positive phototropism), while roots grow away from light (negative phototropism).
In chemotropism, plants grow toward or away from certain chemicals.
In hydrotropism, plants grow toward water (positive hydrotropism).
For the given question, the shoot's upward movement is specifically a response to gravity, not to light, chemicals, or water.
Thus, the correct designation is negative geotropism.
Answer:D. Negatively geotropic
