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.
1 Reduce the heat to 350 degrees F and cook until the meat is medium-rare (an internal temperature of 125-130 degrees F), about 1 hour and 15 minutes. 2  Keep basting the roast every 30 minutes until it is done. 3  Keep in mind that the roast will continue to cook while resting.