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