Dose-Response Activity - Part B /40 (use more space as needed-you may have more than 1 page) looking at labeling, curve drawing, accurate numbers that are being requested and units (if applicable). You have a test group, whereby rats have been exposed to increasing concentration of a toxicant via ingestion. At 250 ppm 50% of the test subjects died. There was no observable effect until 25 ppm and the effects up to 50 ppm were positive. Thereafter adverse effects were witnessed, such as disorientation and weight loss. 1. Draw a dose response curve to demonstrate the information provided above. Ensure to label both axis, the threshold, the NOEL, the NOAEL and the LD50. (10 Marks) 2. Rats were exposed to an increasing concentration of a toxicant via inhalation. At 35 ppm all of the test subjects died. At 15 ppm a reaction was noted in the rats, they were seen to be quicker at solving a maze; but just 5 ppm more of the toxicant made the rats confused and just 5 more ppm and half of the rats died. (10 Marks)