Review Test in Science 9 First Quarter

The alveoli are important in the respiratory system because they—

• Pump air into the lungs

• Produce mucus to trap dirt

• Provide a large surface area for gas exchange

• Push oxygen into the blood vessels

Which process occurs when the diaphragm contracts?

• Air is forced out of the lungs
  

• Air enters because chest volume increases

• Oxygen diffuses out of the blood

Which part of the circulatory system carries oxygen-rich blood from the lungs to the heart?

• Pulmonary artery

• Pulmonary vein

• Aorta

• Vena cava

Which statement best explains why the left ventricle has a thicker wall than the right ventricle?

• It pumps blood directly to the lungs

• It pumps blood to the whole body under higher pressure

• It stores oxygen-rich blood for the atrium

• It regulates the flow of blood to the brain only

Which path correctly traces the flow of blood through the heart and lungs?

• Right atrium → right ventricle → pulmonary artery → lungs

• Left atrium → left ventricle → pulmonary artery → lungs

• Right ventricle → right atrium → pulmonary vein → lungs

• Left ventricle → left atrium → vena cava → lungs

What condition occurs when the coronary arteries are blocked, cutting off blood supply to heart muscles?

• Stroke

• Hypertension

• Anemia

• Heart attack

Which is an example of codominance in humans?

• Skin color blending

• Tongue rolling ability

• Blood type AB

• Eye color inheritance

In incomplete dominance, crossing a red-flowered plant with a white-flowered plant will produce—

• Red and white flowers

• Pink flowers

• Only white flowers

• Only red flowers

Hemophilia is an example of what type of genetic disorder?

• Sex-linked

• Autosomal dominant

• Codominant

• Multiple alleles

A forest with 50 species of trees is said to have high—

• Carrying capacity

• Richness

• Diversity

• Abundance