1ST_QUARTER_MARCIANO_SCI9
  • 1. The dome-shaped muscle responsible for breathing is called:
A) Bronchi
B) Diaphragm
C) Valve
D) Trachea
  • 2. Blood vessels that carry blood away from the heart are called:
A) Arteries
B) Veins
C) Venules
D) Capillaries
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Capillaries
B) Venules
C) Veins
D) Arteries
  • 4. The voice box is scientifically called:
A) Trachea
B) Larynx
C) Alveoli
D) Pharynx
  • 5. The respiratory system supplies oxygen and removes:
A) Carbon dioxide
B) Nitrogen
C) Water
D) Hydrogen
  • 6. The windpipe is also known as:
A) Esophagus
B) Alveoli
C) Bronchus
D) Trachea
  • 7. The fluid component of blood is:
A) Platelets
B) Hemoglobin
C) Plasma
D) Oxygen
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Alveoli → Bronchi → Trachea
B) Nose → Bronchi → Trachea → Alveoli
C) Nose → Pharynx → Esophagus → Alveoli
D) Nose → Trachea → Bronchi → Alveoli
  • 9. What is the main function of white blood cells?
A) Carry oxygen
B) Defend against infection
C) Transport nutrients
D) Clot blood
  • 10. Which organ pumps blood throughout the body?
A) Kidney
B) Lungs
C) Heart
D) Brain
  • 11. Which lifestyle factor MOST increases the risk of lung cancer?
A) Smoking
B) Sleeping early
C) Exercise
D) Healthy diet
  • 12. What happens to the heart rate during regular exercise?
A) Increases permanently
B) Decreases efficiency
C) Stays the same
D) Becomes more efficient
  • 13. Which factor lowers the risk of cardiovascular disease?
A) Sedentary lifestyle
B) High-salt diet
C) Smoking
D) Regular physical activity
  • 14. Which inheritance shows blending of traits?
A) Multiple alleles
B) Sex-linked
C) Incomplete dominance
D) Codominance
  • 15. In codominance, what happens to the traits of both parents?
A) Both are expressed
B) Only recessive is expressed
C) One is hidden
  • 16. A pink flower from red and white parents shows:
A) Polygenic
B) Multiple alleles
C) Incomplete dominance
D) Codominance
  • 17. Which alleles control human blood type?
A) T, t
B) A, B, O
C) H, h
D) X, Y
  • 18. Baldness in males is an example of:
A) Polygenic
B) Codominance
C) Incomplete dominance
D) Sex-influenced trait
  • 19. Which condition results from having an extra chromosome 21?
A) Down syndrome
B) Hemophilia
C) Turner’s syndrome
D) Klinefelter’s syndrome
  • 20. If a red cow and white cow produce a roan calf, the inheritance pattern is:
A) Polygenic
B) Multiple alleles
C) Incomplete dominance
D) Codominance
  • 21. Which is NOT an example of non-Mendelian inheritance?
A) Incomplete dominance
B) Codominance
C) Simple dominance
  • 22. Which inheritance pattern involves genes located on sex chromosomes?
A) Codominance
B) Sex-linked
C) Multiple alleles
D) Polygenic
  • 23. If a person has genotype IAi, his blood type is:
A) Type AB
B) Type OA
C) Type O
D) Type A
  • 24. What is the chronic respiratory condition that causes difficulty in breathing due
    to inflammation of the airways?
A) Asthma
B) Bronchitis
C) Emphysema
D) Pneumonia
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Digestive System
B) Excretory System
C) Circulatory system
D) Nervous System
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Diaphragm
B) Epiglottis
C) Larynx
D) Ribcage
  • 27. Which part of the respiratory system warms, moistens, and filters the air?
A) Trachea
B) Alveoli
C) Nose
D) Bronchi
  • 28. Lack of physical activity may lead to:
A) Stronger heart
B) Healthy arteries
C) Obesity and hypertension
D) Better lung function
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Polygenic inheritance
B) Codominance
C) Multiple alleles
D) Incomplete dominance
  • 30. Which blood type shows codominance of A and B alleles?
A) Type O
B) Type A
C) Type B
D) Type AB
  • 31. Which chromosome pair determines the sex of humans?
A) 1–22 autosomes
B) X and Y chromosomes
C) Hemoglobin pair
D) Chromosome 21
  • 32. The main function of the respiratory system is:
A) Breaking down food
B) Sending signals
C) Exchanging gases
D) Pumping blood
  • 33. The circulatory system is also known as the:
A) Digestive system
B) Skeletal system
C) Lymphatic system
D) Cardiovascular system
  • 34. Which blood vessel carries blood back to the heart?
A) Capillaries
B) Bronchi
C) Veins
D) Arteries
  • 35. Which part of the blood fights infection?
A) Plasma
B) White blood cells
C) Platelets
D) Red blood cells
  • 36. A runner takes deep breaths after a sprint. Which system primarily helps restore balance?
A) Respiratory system
B) Endocrine System
C) Circulatory System
D) Nervous System
  • 37. A person with asthma attacks should avoid:
A) Exercise
B) Drinking water
C) Dust and smoke
D) Fresh air
  • 38. Which situation demonstrates codominance?
A) A white flower and red flower produce pink flowers
B) Tall and short parents producing medium offspring
C) Brown-eyed and blue-eyed parents producing green-eyed children
D) A black chicken and white chicken produce speckled offspring
  • 39. If a father is color-blind and the mother is a carrier, their son has what probability of being color-blind?
A) 50%
B) 75%
C) 100%
D) 25%
  • 40. Which lifestyle change will most improve circulatory health?
A) Quit smoking
B) Avoid fruits
C) Increase salt intake
D) Eat processed foods
  • 41. A student notes that his pulse rate increases after jogging. What explains this?
A) The nervous system shuts down
B) The body needs more oxygen
C) The lungs collapse
D) Blood volume decreases
  • 42. Which best explains why multiple alleles traits vary widely in a population?
A) They are sex-linked
B) They involve many genes
C) They skip generations
D) They are caused by environment alone
  • 43. Which situation best shows incomplete dominance?
A) A red flower and white flower produce pink offspring
B) A tall and short plant produce a tall plant
C) A black chicken and white chicken produce only black offspring
D) A red cow and white cow produce a roan calf
  • 44. Why does the body increase breathing rate during exercise?
A) To store more oxygen in stomach
B) To release more carbon dioxide
C) To prevent sweating
D) To increase bone growth
  • 45. A farmer crossbreeds a red flower (RR) and white flower (WW). The offspring are all pink (RW). Which inheritance is this?
A) Simple dominance
B) Codominance
C) Incomplete dominance
D) Polygenic inheritance
  • 46. Which school activity BEST integrates knowledge of non-Mendelian inheritance?
A) Designing Punnett squares for codominance and incomplete dominance
B) Painting random pictures
C) Ignoring genetics in biology class
D) Playing unrelated video games
  • 47. A city wants to lower rates of respiratory disease. Which program is BEST?
A) Increase the price of healthy food
B) Encourage longer screen time for students
C) Reduce air pollution and enforce anti-smoking laws
D) Build more gyms and promote fitness
  • 48. If tasked to evaluate the risks of poor diet, which statement is MOST accurate?
A) Poor diet may lead to obesity, heart disease, and diabetes
B) Poor diet has no effect if you are young
C) Poor diet only affects appearance, not health
D) Poor diet improves lung function
  • 49. Which conclusion is most accurate about lifestyle diseases?
A) They are always inherited
B) They can be prevented by healthy habits
C) They are caused only by pollution
D) They cannot be prevented
  • 50. A student is designing a campaign to prevent respiratory illnesses. Which slogan is most effective?
A) “Say No to Smoking, Say Yes to Breathing Free!”
B) “Stay Awake All Night!”
C) “Eat Fast Food Now!”
D) “Ignore Your Health”
Created with That Quiz — the site for test creation and grading in math and other subjects.