USA quiz · Grade 7
16 practice questions. Tap an answer, then use the list below to study with a parent or teacher.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: blood
The heart pumps blood through vessels.
Answer: gas exchange (oxygen and carbon dioxide)
Lungs bring in O₂ and release CO₂.
Answer: breaks food into nutrients
Mouth, stomach, intestines.
Answer: away from the heart
Veins return blood toward the heart.
Answer: nervous system
It sends and receives signals.
Answer: movement
Muscles pull on bones.
Answer: kidney
Kidneys are in the excretory system.
Answer: carbohydrates
Sugars and starches.
Answer: protons and neutrons
Electrons move outside the nucleus.
Answer: protons
It identifies the element.
Answer: atomic number
Periods are rows; groups are columns.
Answer: H₂O
Two hydrogen, one oxygen.
Answer: makes a new substance
Rusting and burning are chemical.
Answer: shiny and good conductors
Copper wires conduct electricity.
Answer: Au
Ag is silver; Au is gold.
Answer: two or more elements chemically bonded
NaCl is a compound.
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