It would be seweed!
Yes! It is completely submerged in water.
they need sun,water,and carbon dioxide
No, you do not have to, unless it"s an aquarium plant, then yes.
Plants need three essential things to undergo photosynthesis: sunlight, water, and carbon dioxide. These elements are used by the plant to create glucose, which is the energy source for the plant.
The plant cell will shrink, but its cell wall will prevent it from completely collapsing. In contrast, the animal cell will shrink and may undergo crenation due to the hypertonic solution causing water to leave the cell.
When a plant cell loses water it will undergo a condition called plasmolysis. This condition only happens in the extreme condition and rarely happens in the natural conditions.
The water hyacinth float on the surface, and are not attached to the bottom.
It survives entirely under water and is known as a submergent
Water a snake plant indoors by allowing the soil to dry out completely between waterings. Water the plant sparingly, making sure not to overwater as this can lead to root rot. It is best to water the plant at the base of the leaves, avoiding getting water on the leaves themselves.
The nasturtium plant can be placed in an aquarium, but it most likely will not survive very long. This type of plant does not do well completely immersed in water.
After repotting your plant, water it thoroughly but be careful not to overwater. Allow the water to drain out of the pot completely to prevent root rot. Check the soil moisture regularly and adjust your watering schedule as needed to keep the plant healthy.
Watering poinsettia plantsKeep plant moist but not soaking wet. When you water let the water drain out of the pot completely not allowing the plant to sit in water. You may need to water daily in warmer weather.