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.
For medium beef, cook until it reaches 70Â°C, and for well done, 80Â°C. Cooking times may vary depending on the oven you have and the weight of the meat but as a rough guide:-. For rare beef roast for 11-13 mins on the reduced heat for every 500g. For medium beef roast for 16-18 mins on the reduced heat for every 500g. For well done beef roast for 22-24 mins on the reduced heat for every 500g. If you want to cook your beef rare but donât have a food thermometer to hand, make a little cut with a knife: it should be bright pink in the middle.