Unit 9 Digestive Processes: Question Preview (ID: 24439)


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Is chewing and mixing of food with saliva a chemical change, physical change, or both?
a) chemical change b) physical change c) both d)
Which of the following elements is found in abundance, both in the human body and in the Earth?
a) oxygen b) carbon c) calcium d) silicon
Which of the following elements are found in abundance in the human body, but is NOT found in abundance in the Earth?
a) oxygen b) carbon c) calcium d) silicon
A graphic (drawing) of a molecule is a model. All of the following are limitations of the model EXCEPT-
a) the actual size of the molecule. b) the actual size of the atoms. c) the elements present. d) the uses of the substance.
Is chewing and mixing of food with saliva a chemical change, physical change, or both?
a) Chemical change b) Physical change c) Both d)
Corn is an organic compound. What are the main elements found in corn?
a) carbon, sulfur, calcium b) carbon, magnesium, nitrogen c) carbon, nitrogen, sodium d) carbon, hydrogen, oxygen
When a person eats too much food, they store the extra energy as fat. What type of energy conversion is going on in the body as energy from food is turned to fat?
a) mechanical to thermal b) chemical to chemical c) thermal to chemical d) thermal to radiant
Animals are consumers, meaning they need to eat food for energy because they cannot make their own. What energy transformation is taking place when an animal eats food so it can keep warm?
a) mechanical to thermal b) mechanical to radiant c) chemical to thermal d) radiant to chemical
Which set of elements would be most likely to support life?
a) sulfur, hydrogen, plutonium b) carbon, hydrogen, oxygen c) oxygen, helium, calcium d) nitrogen, potassium, xeon
Carbohydrates are large, complex molecules that can be broken down into smaller molecules called-
a) fats. b) energy. c) vitamins. d) sugars.
Which function is performed primarily by the digestive system?
a) Exchange of gases between the blood and its environment. b) Removes wastes from the body. c) Breakdown of large molecules into smaller ones. d) Transports nutrients to cells.
Which of the following includes only chemical changes that occur in the digestive process?
a) Absorption of nutrients by the villi in the small intestines. b) chewing and swallowing food c) Recycling of water from dissolved food back into the body. d) Reaction of saliva, stomach acid, bile, and pancreatic juices with food.
Which step in the digestive process represents a chemical change in food?
a) Storing of swallowed food in the stomach. b) Churning of food, liquids, and digestive juices in the stomach. c) Movement of food down the esophagus to the stomach. d) Substances in the mouth and stomach breaking down fats and proteins.
Which of the following is a physical change to pizza?
a) Saliva changing the starch in the pizza crust to sugar. b) Teeth tearing off a bite of pizza. c) Chemicals in the stomach digesting proteins. d) Breaking down of fats in the pizza by bile.
In the large intestine water from the undigested food is reabsorbed. Is this a chemical change, physical change or both?
a) chemical change b) physical change c) both d)
In the stomach the churning mixes food with the fluid. Is this a chemical change, physical change, or both?
a) chemicial change b) physical change c) both d)
In the stomach gastric juices break down proteins into amino acids. Is this a chemical change, physical change, or both?
a) chemical change b) physical change c) both d)
In the small intestine carbohydrates, proteins, and lipids are broken down into smaller molecules. Is this a chemical change, physical change, or both?
a) chemical change b) physical change c) both d)
In the mouth some starches in the food is converted into sugars. Is this a chemical change, physical change or both?
a) chemical change b) physical change c) both d)
In the mouth food is torn and ground to increase the surface area is this a chemical change, physical change or both?
a) chemical change b) physical change c) both d)
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