Digestive System
What is the main function of the digestive system?
A. Absorb oxygen into the blood
B. Pump blood through the body
C. Take in food and break it down into small molecules
D. Remove waste through urine
C. Take in food and break it down into small molecules
Which two systems work together to deliver oxygen and food molecules to cells?
A. Digestive and nervous systems
B. Respiratory and circulatory systems
C. Muscular and skeletal systems
D. Lymphatic and endocrine systems
B. Respiratory and circulatory systems
Food can be considered a type of what?
A. Waste
B. Fuel
C. Mineral
D. Enzyme
B. Fuel
Like humans, what do most animals need to take in to get energy?
A. Oxygen only
B. Water only
C. Food
D. Carbon dioxide
C. Food
What is the main source of energy that drives Earth’s weather?
A. Earth’s core
B. The Sun
C. The Moon
D. Ocean waves
B. The Sun
Where in the digestive system are small food molecules absorbed into the blood?
A. Stomach
B. Small intestine
C. Large intestine
D. Esophagus
B. Small intestine
What gas do cells need for chemical reactions that release energy?
A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Hydrogen
C. Oxygen
What happens to most of the matter when fat is burned in the body?
A. It disappears
B. It turns into energy only
C. It goes into the air as carbon dioxide and water
D. It turns into protein
C. It goes into the air as carbon dioxide and water
What do animals release when they burn food for energy?
A. Food molecules and oxygen
B. Fat and protein
C. Carbon dioxide, water, and energy
D. Minerals and vitamins
C. Carbon dioxide, water, and energyA. Food molecules and oxygen
B. Fat and protein
C. Carbon dioxide, water, and energy
D. Minerals and vitamins
Which process causes warm air to rise and cool air to sink in the atmosphere?
A. Radiation
B. Conduction
C. Convection
D. Evaporation
C. Convection
What type of reaction breaks down food into small molecules the body can use?
A. Physical reaction
B. Chemical reaction
C. Photosynthesis
D. Evaporation
B. Chemical reaction
What are the main outputs of cellular respiration?
A. Food molecules and oxygen
B. Fat and fiber
C. Carbon dioxide, water, and energy
D. Minerals and vitamins
C. Carbon dioxide, water, and energy
What does the body use when it doesn’t take in enough food?
A. Water only
B. Stored fat molecules or molecules dedicated for growth
C. Only carbohydrates
D. Extra oxygen
B. Stored fat molecules or molecules dedicated for growth
If a small mammal stored extra food as fat in winter, what process would it use to survive when food is scarce?
A. Photosynthesis
B. Burning stored fat for energy
C. Excretion of fat
D. Absorbing oxygen from water
B. Burning stored fat for energy
Why does warm air usually rise in the atmosphere?
A. Warm air has more oxygen
B. Warm air is less dense than cool air
C. Warm air has more moisture
D. Warm air is heavier
B. Warm air is less dense than cool air
What happens to excess food molecules if they are not immediately needed for energy?
A. Stored as fat
B. Excreted as urine
C. Released as carbon dioxide
D. Destroyed
A. Stored as fat
How do the respiratory and circulatory systems remove waste products from cells?
A. They store it in fat cells
B. They excrete it in urine
C. They carry carbon dioxide out of the body through the lungs
D. They convert it to oxygen
C. They carry carbon dioxide out of the body through the lungs
At what location in the body does oxygen enter to be absorbed by blood cells?
A. Small Intestine
B. Brain
C. Alveoli
D. Stomach
C. Alveoli
Why is oxygen important for all animals when they use stored food for energy?
A. Oxygen turns food into fat
B. Oxygen is needed for chemical reactions that release energy from food or fat molecules
C. Oxygen stores energy in muscles
D. Oxygen is not important
B. Oxygen is needed for chemical reactions that release energy from food or fat molecules
How does uneven heating of Earth’s surface affect weather?
A. It stops air from moving
B. It only affects ocean temperatures
C. It causes air to move, creating wind and weather patterns
D. It lowers Earth’s temperature
C. It causes air to move, creating wind and weather patterns
Why did M’Kenna absorb less food through her small intestine, and how did this affect her body?
A. She absorbed more food, causing her to gain too much weight
B. She absorbed less food, so her digestive system sped up
C. She absorbed less food, but her cells got energy from water
D. She absorbed less food, so her cells didn’t get enough energy, causing non-digestive symptoms
D. She absorbed less food, so her cells didn’t get enough energy, causing non-digestive symptoms
How did M’Kenna’s low absorption of food molecules affect energy production?
A. Her cells had extra energy and oxygen
B. Her cells didn’t get enough food molecules, so even with oxygen, they couldn’t produce enough energy
C. Her cells produced more energy than normal
D. Oxygen was not needed
B. Her cells didn’t get enough food molecules, so even with oxygen, they couldn’t produce enough energy without glucose
Why can fat be used as energy and still conserve matter?
A. Fat reacts with oxygen to release energy, and mass leaves as carbon dioxide and water
B. Fat disappears when burned.
C. Fat turns into sugar without changing mass
D. Fat does not release energy
A. Fat reacts with oxygen to release energy, and mass leaves as carbon dioxide and water
bird migrates long distances in winter. How can we apply what we know about humans and M’Kenna to explain how it uses energy and stores matter?
A. Birds only use oxygen to move
B. Birds don’t store energy
C. Birds eat food to store fat before migration, then burn fat for energy, releasing carbon dioxide and water
D. Birds convert fat into protein only
C. Birds eat food to store fat before migration, then burn fat for energy, releasing carbon dioxide and water
Which weather condition is most likely to form when warm, moist air rises quickly?
A. Clear skies
B. Fog only
C. Clouds and storms
D. Snow
C. Clouds and storms