The correct answer to the question is option 4: Negatively geotropic. To understand why shoots of a plant show upward movement, we need to understand the concept of geotropism.

Geotropism is the growth or movement of plants in response to gravity. It can be positive or negative, depending on the direction of growth related to the force of gravity. If a plant exhibits positive geotropism, it means that the plant grows or moves towards the force of gravity, in this case, downwards. On the other hand, if a plant exhibits negative geotropism, it means that the plant grows or moves away from the force of gravity, in this case, upwards.

In the given question, the shoots of the plant show upward movement, which indicates negative geotropism. This means that the shoots are growing in the opposite direction of gravity, towards the light source. This behavior is commonly observed in plants as they strive to maximize their exposure to sunlight for photosynthesis and growth.

Therefore, the correct designation for the upward movement of plant shoots is negative geotropism.