9th grade human body and health

Question 1

A cell respires 5 molecules of glucose aerobically. Using C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, how many molecules of carbon dioxide are produced?

Answer 

Question 2

Which is the balanced symbol equation for aerobic respiration?

• A. 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
• B. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
• C. C₆H₁₂O₆ + O₂ → CO₂ + H₂O
• D. C₆H₁₂O₆ + 6CO₂ → 6O₂ + 6H₂O

Question 3

What type of pathogen causes cholera?

• A. virus
• B. bacterium
• C. fungus
• D. protist

Question 4

What type of pathogen causes influenza (flu)?

• A. virus
• B. bacterium
• C. fungus
• D. protist

Question 5

Disease: which statement is NOT true?

• A. Antibiotics kill bacteria but not viruses.
• B. Mosquitoes spread malaria.
• C. Some bacteria have become resistant to antibiotics.
• D. You can catch heart disease from someone else.

Question 6

During exercise an athlete's cardiac output is 8.4 dm³ per minute and their stroke volume is 70 cm³. What is their heart rate, in beats per minute? (1 dm³ = 1000 cm³)

Answer bpm

Question 7

Why are patients told to finish the whole course of antibiotics?

• A. To kill all the bacteria so none survive to become resistant
• B. Because antibiotics are vitamins
• C. To prevent future viral infections
• D. To use up the packet

Question 8

Under ideal conditions a bacterium divides every 30 minutes. A drop of milk starts with 10 bacteria. How many bacteria will there be after 4 hours?

Answer 

Question 9

A person's stroke volume is 75 cm³ and their heart rate is 150 beats per minute. What is their cardiac output, in cm³ per minute?

Answer cm³/min

Question 10

Which is a way to reduce the spread of flu?

• A. eating more sugar
• B. taking antibiotics
• C. washing hands and covering coughs and sneezes
• D. sharing cups

Question 11

Measles spreads quickly in crowded rooms. How?

• A. through contaminated soil
• B. droplets in the air from coughs and sneezes
• C. by mosquito bites
• D. through plant roots

Question 12

After exercise, a student counts 20 pulse beats in 30 seconds. What is the heart rate in beats per minute?

Answer bpm

Question 13

Which type of medicine is described: gives cells mRNA instructions to make a harmless viral protein?

• A. vaccine
• B. antibiotic
• C. painkiller

Question 14

Which type of respiration does this describe: it produces lactic acid in muscles?

• A. aerobic only
• B. anaerobic only
• C. both

Question 15

In one region, measles vaccination coverage rose from 68 % to 95 %. Yearly measles cases fell from 71 to 6. Which conclusion is best supported?

• A. Cases fell sharply after vaccination rose, which supports the vaccine reducing measles.
• B. The data prove that measles has disappeared everywhere.
• C. The vaccine made measles cases rise.
• D. Vaccination has no link with the number of cases.

Question 16

A cell respires 10 molecules of glucose aerobically. Using C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, how many molecules of carbon dioxide are produced?

Answer