A growth medium or culture medium is a liquid or gel designed to support the growth of microorganisms or cells, or small plants like the moss Physcomitrella patens. There are different types of media for growing different types of cells.
Best Answer: Reading some arbitrary definition of a crystal might get confusing so I'll simplify it. What you are thinking of are the chemical compound called calcium oxalate.They form needle shaped crystals in a plant cell's vacuole that pretty much look like toothpicks. Their main function is to protect the plant from herbivores.They aren't chemically poisonous but because of their shape, they can prick soft tissue.hen an herbivore eat a part of the plant, the vacuoles are smashed up and these needle like crystals are exposed along with the sap of the plant. Perhaps you've been exposed to these crystals when you squeeze a part of a plant and touch its sap.
Cell walls perform many essential functions: they provide shape to form the tissue and organs of the plant, and play an important role in intercellular communication and plant-microbe interactions. Specialized cell-to-cell communication pathways known as plasmodesmata, pores in the primary cell wall through which the plasmalemma and endoplasmic reticulum of adjacent cells are continuous. Plastids, the most notable being the chloroplast, which contains chlorophyll, a green-colored pigment that absorbs sunlight, and allows the plant to make its own food in the process known as photosynthesis.