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.
How long you would cook a 2.2 pound beef roast depends upon how you  like it cooked. For a rare beef roast, cook at 200 degrees  Celsius/390 degrees Fahrenheit for 30 minute â¦ s. For a medium beef  roast, cook for 45 minutes or for well done meat, cook for an hour.he method of cooking a roast in a roaster is called braising. A three pound roast would cook aproximately 2 to 2 1/2 hours at 325. The inside temperature should be 140 degree â¦ s for rare, 160 degrees for medium, and 170 degrees for well-done.