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.
Drizzle the beef with olive oil and season well with salt and pepper, rubbing it all over the meat. Place the beef on top of the vegetables. To cook your beef: Place the roasting tray in the preheated oven. Turn the heat down immediately to 200Â°C/400Â°F/gas 6 and cook for 1 hour for medium beef. If you prefer it medium-rare, take it out 5 to 10 minutes earlier. For well done, leave it in for another 10 to 15 minutes.