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