Question

1. Suppose life is identified on a different planet and that it is similar to life forms on Earth. Assuming that this new life form eats predominantly plants, what adaptations would you expect to find in its digestive system to enable it to grow and thrive in this environment? Select all that apply.

A. predominantly sharp teeth

B. predominant teeth for grinding

C. an elongated alimentary canal

D. a shortened alimentary canal

E. fewer symbiotic bacteria to break down starch

2. Hormones are used to regulate many processes in the body, including the regulation of appetite and satiety. If an individual already has enough stored glucose and has started storing energy in adipose tissue, which hormone would you expect to be released to decrease appetite?

A. insulin

B. ghrelin

C. glucagon

D. leptin

Answer 1

1. Herbivores have long alimentary canal because plants are made up of chemical substances like cellulose, pectin & lignin, which are difficult to digest. Hence herbivores have long intestine which provide enough time for the breakdown & absorption. Option C is correct all other statements are wrong beacuse herbivore have a flattened teeth not sharp teeths & they contain large amount of microbes for easy digestion.

2. Leptin hormones are produced by fat cells which decrease appetite. Ghrelin is mainly produced by stomach which increase appetite. Glucagon & insulin are peptide hormones. Glucagon is released by the alpha cells of pancreas which increase the concentration of glucose in the blood, while insulin is secreted by beta cells of pancreatic islets to reduce high blood glucose levels. So option D leptin is the correct answer.