Raphide crystals are needle-shaped crystals found in the cells of some plants. They serve as a defense mechanism against herbivores. When an animal tries to eat the plant, these sharp crystals can cause irritation or injury to the mouth and digestive tract, deterring the animal from further consumption.
In addition to their defensive role, raphide crystals are also involved in the storage of calcium within the plant. Calcium is an essential nutrient for plant growth and development, and these crystals help regulate its levels within the plant cells.
Overall, raphide crystals play a crucial role in both protecting the plant from predators and maintaining its internal nutrient balance.