The predominant function of thorns, spines and prickles is deterring herbivory in a mechanical form. Not all functions of spines or glochids are limited to defence from physical attacks by herbivores and other animals.echnically speaking, many plants commonly thought of as having thorns or spines actually have prickles. Roses, for instance, have prickles. Other structures that look alike are spinose teeth, spinose apical process, stiff trichomes and stinging trichomes.
1 This will help the sirloin cook from all angles and sear in the juices.  Grill the steak with lid down for 4-5 minutes depending on thickness. When grilling steaks, you need to resist the urge to open the lid and look.
After marinating them, instantly place them in the oven and set the oven to broil. Place the steaks directly over the broiler in the oven and cook the steaks for 3 to 4 minutes for each side. Remove the steaks and place a piece of tented foil over them for 6 minutes before serving.CRP photo. Frying sirloin steaks is a popular cooking method.fter marinating them, instantly place them in the oven and set the oven to broil. Place the steaks directly over the broiler in the oven and cook the steaks for 3 to 4 minutes for each side. Remove the steaks and place a piece of tented foil over them for 6 minutes before serving.