Each group contained 25 cattails. All of the groups were grown in the same type of soil, they all received the same amount of light, and they were all kept at the same
Cooking at a constant oven temperature of 300Â°F (160Â°C), a 5- to 8-lb standing rib roast will take 17-19 minutes per pound for rare, 20-22 for medium rare, 23-25 minutes for medium, and 27-30 minutes for well done.ow long and at what temperature should I cook a beef roast in the oven? Roasting is a great cooking method for a large, tender cut of beef  such as a rib or sirloin roast.
TIPS FOR ROASTING BEEF. 1  Let the meat come to room temperature before you cook it. 2  Roast the beef at a high temperature (240Â°C/fan220Â°C/gas 9, or as high as your oven will go) for about 15 minutes to get the heat through to the centre of the joint. 3  Rest the meat before carving. Roast the beef at a high temperature (240Â°C/fan220Â°C/gas 9, or as high as your oven will go) for about 15 minutes to get the heat through to the centre of the joint.