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.
After 20 minutes, reduce oven temperature to 325 degrees. Roast for 1 1/2 to 2 hours, depending on how rare or done you like your beef. For medium-rare: remove when internal temperature reaches 135 degrees.Let roast stand/rest for 10-15 minutes before carving.fter 20 minutes, reduce oven temperature to 325 degrees. Roast for 1 1/2 to 2 hours, depending on how rare or done you like your beef. For medium-rare: remove when internal temperature reaches 135 degrees.