from soil.
All Plants must obtain water by osmosis
Plants primarily obtain water through their roots, which have root hairs that absorb water from the soil. Water is then transported through the plant's vascular system (xylem) to all parts of the plant for various physiological processes. Stomata on the leaves also play a role in water absorption and transpiration.
Plants obtain oxygen during photosynthesis from water molecules.
Through the roots, but some plants obtain humidity through their leaves.
Unless they are legumes, from the soil.
Most seed plants live on sunlight, water, and nutrients from the soil. They use sunlight to produce energy through photosynthesis, absorb water through their roots, and obtain essential nutrients from the soil to support their growth and development.
Water plants primarily obtain carbon dioxide (CO2) from the surrounding water through a process known as diffusion. CO2 readily dissolves in water, allowing aquatic plants to take it up through their leaves and use it for photosynthesis. Some water plants may also obtain CO2 from decaying organic matter in the water or from the sediment.
It depends what you mean by "food". All plants need sunlight, water and nutrients to "eat" and make energy which they do themselves. Most plants are able to obtain nutrients from the soil or water, but some plants are carnivorous and catch their own food in order to obtain nutrients which they could not otherwise obtain. Some of the common examples of this are the venus flytrap and the pitcher plants which are able to live in nutrient poor regions. These catch insects and digest them for nutrients, but they do not obtain energy from this process as carnivorous animals do.
1. Rhizoids keep plants attached on the soil 2. Rhizoids absorb water and nutrients Rhizoids utilize capillary action to absorb water by moving the water up them for absorption by certain plants, sponges and fungi. They use the same methods to absorb nutrients. Edit : to obtain water [GradPoint/Novanet]
Caterpillars do need water to live but they do not drink water. They obtain their water supply from food plants.
Sunlight
Most organisms obtain nitrogen in the form of nitrate (NO3-) or ammonium (NH4+). These forms of nitrogen are usually present in the soil and can be taken up by plants. Animals then obtain nitrogen by consuming plants or other animals.