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.
Cooking The Sirloin Steak. Now that your steak is seasoned and the skillet is nice and hot, it is time to start cooking! Place your steak onto the skillet. It is important to note that the skillets with the ridges on the inside are great for steaks.These ridges give your steak the nice gridlines. Place the steak onto the skillet and let it cook on one side for 2 minutes. key to cooking a sirloin on the stove top is to have the proper equipment. The obvious things needed are a sirloin steak, a stove, and a cast iron skillet. Spray the skillet with some some non-stick cooking spray, or you can use olive oil.