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) Veins
B) Venules
C) Arteries
D) Capillaries
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Veins
B) Capillaries
C) Arteries
D) Venules
  • 4. The voice box is scientifically called:
A) Alveoli
B) Trachea
C) Pharynx
D) Larynx
  • 5. The respiratory system supplies oxygen and removes:
A) Nitrogen
B) Water
C) Hydrogen
D) Carbon dioxide
  • 6. The windpipe is also known as:
A) Alveoli
B) Trachea
C) Bronchus
D) Esophagus
  • 7. The fluid component of blood is:
A) Plasma
B) Platelets
C) Hemoglobin
D) Oxygen
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Pharynx → Esophagus → Alveoli
B) Nose → Alveoli → Bronchi → Trachea
C) Nose → Bronchi → Trachea → Alveoli
D) Nose → Trachea → Bronchi → Alveoli
  • 9. What is the main function of white blood cells?
A) Clot blood
B) Carry oxygen
C) Transport nutrients
D) Defend against infection
  • 10. Which organ pumps blood throughout the body?
A) Kidney
B) Brain
C) Lungs
D) Heart
  • 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) Becomes more efficient
B) Stays the same
C) Decreases efficiency
D) Increases permanently
  • 13. Which factor lowers the risk of cardiovascular disease?
A) High-salt diet
B) Sedentary lifestyle
C) Regular physical activity
D) Smoking
  • 14. Which inheritance shows blending of traits?
A) Multiple alleles
B) Sex-linked
C) Codominance
D) Incomplete dominance
  • 15. In codominance, what happens to the traits of both parents?
A) One is hidden
B) Only recessive is expressed
C) Both are expressed
  • 16. A pink flower from red and white parents shows:
A) Polygenic
B) Incomplete dominance
C) Codominance
D) Multiple alleles
  • 17. Which alleles control human blood type?
A) X, Y
B) T, t
C) A, B, O
D) H, h
  • 18. Baldness in males is an example of:
A) Codominance
B) Incomplete dominance
C) Sex-influenced trait
D) Polygenic
  • 19. Which condition results from having an extra chromosome 21?
A) Klinefelter’s syndrome
B) Down syndrome
C) Hemophilia
D) Turner’s syndrome
  • 20. If a red cow and white cow produce a roan calf, the inheritance pattern is:
A) Codominance
B) Multiple alleles
C) Polygenic
D) Incomplete dominance
  • 21. Which is NOT an example of non-Mendelian inheritance?
A) Codominance
B) Simple dominance
C) Incomplete dominance
  • 22. Which inheritance pattern involves genes located on sex chromosomes?
A) Codominance
B) Multiple alleles
C) Polygenic
D) Sex-linked
  • 23. If a person has genotype IAi, his blood type is:
A) Type A
B) Type O
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) Emphysema
B) Asthma
C) Pneumonia
D) Bronchitis
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Digestive System
B) Nervous System
C) Circulatory system
D) Excretory System
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Larynx
B) Epiglottis
C) Ribcage
D) Diaphragm
  • 27. Which part of the respiratory system warms, moistens, and filters the air?
A) Trachea
B) Bronchi
C) Alveoli
D) Nose
  • 28. Lack of physical activity may lead to:
A) Stronger heart
B) Better lung function
C) Healthy arteries
D) Obesity and hypertension
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Multiple alleles
B) Polygenic inheritance
C) Incomplete dominance
D) Codominance
  • 30. Which blood type shows codominance of A and B alleles?
A) Type AB
B) Type O
C) Type B
D) Type A
  • 31. Which chromosome pair determines the sex of humans?
A) Hemoglobin pair
B) Chromosome 21
C) X and Y chromosomes
D) 1–22 autosomes
  • 32. The main function of the respiratory system is:
A) Pumping blood
B) Exchanging gases
C) Breaking down food
D) Sending signals
  • 33. The circulatory system is also known as the:
A) Cardiovascular system
B) Lymphatic system
C) Digestive system
D) Skeletal system
  • 34. Which blood vessel carries blood back to the heart?
A) Arteries
B) Capillaries
C) Veins
D) Bronchi
  • 35. Which part of the blood fights infection?
A) White blood cells
B) Platelets
C) Plasma
D) Red blood cells
  • 36. A runner takes deep breaths after a sprint. Which system primarily helps restore balance?
A) Respiratory system
B) Circulatory System
C) Nervous System
D) Endocrine System
  • 37. A person with asthma attacks should avoid:
A) Dust and smoke
B) Fresh air
C) Drinking water
D) Exercise
  • 38. Which situation demonstrates codominance?
A) A black chicken and white chicken produce speckled offspring
B) A white flower and red flower produce pink flowers
C) Tall and short parents producing medium offspring
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) Quit smoking
B) Eat processed foods
C) Avoid fruits
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 are caused by environment alone
B) They involve many genes
C) They are sex-linked
D) They skip generations
  • 43. Which situation best shows incomplete dominance?
A) A black chicken and white chicken produce only black offspring
B) A tall and short plant produce a tall plant
C) A red cow and white cow produce a roan calf
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 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) Incomplete dominance
B) Codominance
C) Polygenic inheritance
D) Simple dominance
  • 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) Increase the price of healthy food
C) Encourage longer screen time for students
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 has no effect if you are young
B) Poor diet improves lung function
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 are always inherited
B) They cannot be prevented
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) “Say No to Smoking, Say Yes to Breathing Free!”
C) “Ignore Your Health”
D) “Eat Fast Food Now!”
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