Some aquatic plants, like water hyacinth, have swollen petioles that act as floats. Many form floating mats which block water ways and are serious weeds e.g. Salvinia and alligator weed.
The part of a seaweed that holds it up is called the stipe, which is similar to a stem in land plants. The stipe provides support and allows the seaweed to reach towards sunlight, while the holdfast anchors it to the substrate, such as rocks or sand, preventing it from being swept away by currents. Together, these structures help the seaweed maintain its position in the water column.
Stationary mean "not moving" so it must mean the the position is not moving or stay the same place.
Chloroplasts are generally stationary within plant cells. They are anchored in place by a network of proteins that help maintain their position and ensure they are properly distributed throughout the cell for efficient photosynthesis. However, some movement can occur in response to environmental stimuli or during cell division.
A stationary ball has potential energy due to its position relative to the ground.
Seaweed
You can compare the object's position relative to a reference point or a fixed landmark to determine if it is moving or stationary. If the object is changing its position relative to the reference point over time, then it is moving. If its position remains constant with respect to the reference point, then it is stationary.
A stationary truck has potential energy, which is energy that is stored in an object due to its position or configuration.
When the surface position of a front does not move, it is said to be stationary. This may indicate a period of relatively stable weather conditions in the area where the front is located. Stationary fronts can lead to prolonged periods of precipitation or dry weather, depending on the atmospheric conditions.
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When the cardboard is at rest, it is not undergoing any motion or change in position. It is stationary and its position remains constant.