Which waste gas do humans exhale as a product of respiration?
  • Oxygen
  • Nitrogen
  • Carbon dioxide
  • Hydrogen
What is the tube that carries urine from the kidney to the urinary bladder called?
  • Urethra
  • Ureter
  • Renal artery
  • Renal vein
In plants, where is excess sugar stored as a waste product that is later used as food?
  • In the leaves as starch
  • In the roots as protein
  • In the flowers as fat
  • In the stem as water
What type of blood does the right ventricle of the heart pump?
  • Oxygenated blood
  • Deoxygenated blood
  • Mixed blood
  • Plasma only
Which organ in humans produces urea by breaking down excess amino acids?
  • Kidney
  • Stomach
  • Liver
  • Pancreas
What is the process of removing waste products from the body called?
  • Digestion
  • Excretion
  • Respiration
  • Circulation
Which of the following is NOT a function of blood in the human body?
  • Transporting oxygen
  • Fighting infections
  • Producing food
  • Carrying nutrients
What do plants store as waste products in their leaves, bark, and fruits that are often useful to humans?
  • Glucose and starch
  • Resins, gums, and essential oils
  • Water and minerals
  • Proteins and fats
What is the largest artery in the human body called?
  • Pulmonary artery
  • Renal artery
  • Aorta
  • Carotid artery
In single-celled animals like Amoeba, how are waste products removed from the body?
  • Through kidneys
  • Through simple diffusion across the cell membrane
  • Through lungs
  • Through a special excretory organ
What is the beating sound of the heart caused by?
  • Blood flowing through arteries
  • The opening and closing of heart valves
  • The contraction of lung muscles
  • The movement of the diaphragm
Which part of the human excretory system stores urine before it is released from the body?
  • Kidney
  • Ureter
  • Urinary bladder
  • Urethra
What is the process called when the kidneys filter blood and remove waste to form urine?
  • Digestion
  • Osmoregulation
  • Ultrafiltration
  • Transpiration
Which of the following animals uses Malpighian tubules for excretion?
  • Fish
  • Insects
  • Frogs
  • Earthworms
What is the average number of times the human heart beats per minute at rest?
  • 40 to 50 times
  • 100 to 120 times
  • 70 to 80 times
  • 150 to 160 times
0 h : 0 m : 1 s

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