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