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.
1 Cook steaks on a heated grill for approximately 7 to 10 minutes per side. 2  The amount of time needed to cook your steak to the desired level will depend on the thickness of your cut. 3  Meanwhile, whisk together all of the Teriyaki Sauce ingredients, through garlic, in a small saucepan.4  Place over medium heat. always try to reach the medium, pink in the center, stage. For these sirloin steaks, that takes about 7 minutes per side. It will differ for you depending on the thickness of your steak. Transfer the grilled steak to a cutting board and slice it thinly, against the grain.