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 Place the steak on the hot burner. 2  Grill until well-browned on one side for about two to three minutes. 3  It is important to the development of the crust that you don't move the meat during this searing process. 4  Flip the steak and grill it on the other side for about two to three minutes.arinating your boneless top sirloin will add flavor to your meat. In order to absorb maximum flavor, meat needs to rest in a marinade in the refrigerator for 24 hours or longer.