Science Concepts for Grade 7

What is the main function of the human digestive system?

• To circulate blood throughout the body.

• To regulate body temperature.

• The main function of the human digestive system is to break down food and absorb nutrients.

• To filter waste from the bloodstream.

Which organ is responsible for the absorption of nutrients?

• small intestine

• liver

• stomach

• pancreas

What is the process of breaking down food into smaller molecules called?

• Digestion

• Absorption

• Metabolism

• Fermentation

Which part of the digestive system is primarily responsible for water absorption?

• Small intestine

• Stomach

• Esophagus

• Large intestine

What is the difference between weather and climate?

• Weather is determined by geography; climate is determined by time zones.

• Weather refers to the average temperature; climate refers to daily changes.

• Weather is short-term; climate is long-term.

• Weather is always rainy; climate is always sunny.

Which instrument is used to measure atmospheric pressure?

• Barometer

• Hygrometer

• Anemometer

• Thermometer

What are the two main components of weather?

• Cloud cover and air pressure

• Visibility and atmospheric pressure

• Temperature and precipitation

• Humidity and wind speed

What is the term for a long-term average of weather conditions?

• Climate

• Atmosphere

• Weather

• Season

What is the pH range of acids?

• 0 to 6.9

• 7 to 14

• 6.9 to 10

• -1 to 0

Which of the following is a common base?

• Potassium chloride (KCl)

• Sodium hydroxide (NaOH)

• Ammonium sulfate ((NH4)2SO4)

• Calcium carbonate (CaCO3)