NDFS 100 Exam 3 BYU with Questions
and Correct Answers Latest 2025-2026
GRADED A+
What are the major roles of water? - CORRECT ANSWERS Transports nutrients;
dissolves amino acids, glucose, minerals, etc. to be excreted; coolant; cleansing
agent.
What factors increase fluid needs? - CORRECT ANSWERS Alcohol; cold weather;
breastfeeding & pregnancy; surgery, blood loss, burns, medications, etc; children;
elderly; certain diseases; forced air environments -- airplanes, sealed buildings, etc.
Hard water is high in what? - CORRECT ANSWERS Calcium and magnesium
Soft water is high in what? - CORRECT ANSWERS Sodium
What foods can be sources of water? - CORRECT ANSWERS Celery and lettuce
What are examples of surface water? - CORRECT ANSWERS Lakes, rivers,
reservoirs
What are surface waters exposed to? - CORRECT ANSWERS Acid rain and pollution
What things can remove contaminants from surface water? - CORRECT ANSWERS
Plants, microorganisms, and sunlight
What can ground water be contaminated by? - CORRECT ANSWERS hazardous
waste, dumps, oil and gas pipelines, sewage
Where is ground water found? - CORRECT ANSWERS Underground
What type of water takes longer to decontaminate? - CORRECT ANSWERS
Groundwater
What is the main function of calcium? - CORRECT ANSWERS Strong bones and
teeth
What are other functions of calcium? - CORRECT ANSWERS Nerve transmission,
blood pressure & clotting, muscle contraction
, What are calcium food sources? - CORRECT ANSWERS Dairy, green vegetables
What are calcium toxicities? - CORRECT ANSWERS Constipation, lowered
absorption of other minerals (especially Iron), kidney stones
What is the main function of magnesium? - CORRECT ANSWERS Assists more than
300 enzymes
What are other functions of magnesium? - CORRECT ANSWERS Muscle function,
bone mineralization
What are magnesium food sources? - CORRECT ANSWERS Nuts, legumes,
seafood, dark green foods, dark chocolate
What are the functions of sodium? - CORRECT ANSWERS Muscle contraction, fluid
balance, nerve transmission, acid-base (pH) balance
What are sodium food sources? - CORRECT ANSWERS Salt, processed (fast) food,
condiments and seasonings
What are sodium toxicities? - CORRECT ANSWERS Hypertension (high blood
pressure), increased risk for heart disease and stroke.
What is the main function of potassium? - CORRECT ANSWERS Muscle
contractions
What are other functions of potassium? - CORRECT ANSWERS Fluid & electrolyte
balance, maintaining steady heartbeat
What are potassium food sources? - CORRECT ANSWERS Fruits and vegetables
What is the main function of iodine? - CORRECT ANSWERS Thyroid regulation
What is the other function of iodine? - CORRECT ANSWERS Metabolic rate
What are iodine food sources? - CORRECT ANSWERS Seafood, fast food, baked
food, milk, salt and sea salt (if iodized)
What are iodine deficiencies? - CORRECT ANSWERS Goiter (thyroid neck growths)
stunted physical and mental growth
What is the function of iron? - CORRECT ANSWERS Hemoglobin & myoglobin
What are food sources of heme iron? - CORRECT ANSWERS Animal Meat (red)
Which iron is easily absorbed? - CORRECT ANSWERS Heme iron
and Correct Answers Latest 2025-2026
GRADED A+
What are the major roles of water? - CORRECT ANSWERS Transports nutrients;
dissolves amino acids, glucose, minerals, etc. to be excreted; coolant; cleansing
agent.
What factors increase fluid needs? - CORRECT ANSWERS Alcohol; cold weather;
breastfeeding & pregnancy; surgery, blood loss, burns, medications, etc; children;
elderly; certain diseases; forced air environments -- airplanes, sealed buildings, etc.
Hard water is high in what? - CORRECT ANSWERS Calcium and magnesium
Soft water is high in what? - CORRECT ANSWERS Sodium
What foods can be sources of water? - CORRECT ANSWERS Celery and lettuce
What are examples of surface water? - CORRECT ANSWERS Lakes, rivers,
reservoirs
What are surface waters exposed to? - CORRECT ANSWERS Acid rain and pollution
What things can remove contaminants from surface water? - CORRECT ANSWERS
Plants, microorganisms, and sunlight
What can ground water be contaminated by? - CORRECT ANSWERS hazardous
waste, dumps, oil and gas pipelines, sewage
Where is ground water found? - CORRECT ANSWERS Underground
What type of water takes longer to decontaminate? - CORRECT ANSWERS
Groundwater
What is the main function of calcium? - CORRECT ANSWERS Strong bones and
teeth
What are other functions of calcium? - CORRECT ANSWERS Nerve transmission,
blood pressure & clotting, muscle contraction
, What are calcium food sources? - CORRECT ANSWERS Dairy, green vegetables
What are calcium toxicities? - CORRECT ANSWERS Constipation, lowered
absorption of other minerals (especially Iron), kidney stones
What is the main function of magnesium? - CORRECT ANSWERS Assists more than
300 enzymes
What are other functions of magnesium? - CORRECT ANSWERS Muscle function,
bone mineralization
What are magnesium food sources? - CORRECT ANSWERS Nuts, legumes,
seafood, dark green foods, dark chocolate
What are the functions of sodium? - CORRECT ANSWERS Muscle contraction, fluid
balance, nerve transmission, acid-base (pH) balance
What are sodium food sources? - CORRECT ANSWERS Salt, processed (fast) food,
condiments and seasonings
What are sodium toxicities? - CORRECT ANSWERS Hypertension (high blood
pressure), increased risk for heart disease and stroke.
What is the main function of potassium? - CORRECT ANSWERS Muscle
contractions
What are other functions of potassium? - CORRECT ANSWERS Fluid & electrolyte
balance, maintaining steady heartbeat
What are potassium food sources? - CORRECT ANSWERS Fruits and vegetables
What is the main function of iodine? - CORRECT ANSWERS Thyroid regulation
What is the other function of iodine? - CORRECT ANSWERS Metabolic rate
What are iodine food sources? - CORRECT ANSWERS Seafood, fast food, baked
food, milk, salt and sea salt (if iodized)
What are iodine deficiencies? - CORRECT ANSWERS Goiter (thyroid neck growths)
stunted physical and mental growth
What is the function of iron? - CORRECT ANSWERS Hemoglobin & myoglobin
What are food sources of heme iron? - CORRECT ANSWERS Animal Meat (red)
Which iron is easily absorbed? - CORRECT ANSWERS Heme iron
