1ST_QUARTER_MARCIANO_SCI9
  • 1. The dome-shaped muscle responsible for breathing is called:
A) Bronchi
B) Diaphragm
C) Trachea
D) Valve
  • 2. Blood vessels that carry blood away from the heart are called:
A) Venules
B) Veins
C) Capillaries
D) Arteries
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Arteries
B) Venules
C) Veins
D) Capillaries
  • 4. The voice box is scientifically called:
A) Larynx
B) Trachea
C) Pharynx
D) Alveoli
  • 5. The respiratory system supplies oxygen and removes:
A) Nitrogen
B) Hydrogen
C) Water
D) Carbon dioxide
  • 6. The windpipe is also known as:
A) Trachea
B) Alveoli
C) Bronchus
D) Esophagus
  • 7. The fluid component of blood is:
A) Platelets
B) Plasma
C) Hemoglobin
D) Oxygen
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Trachea → Bronchi → Alveoli
B) Nose → Pharynx → Esophagus → Alveoli
C) Nose → Alveoli → Bronchi → Trachea
D) Nose → Bronchi → Trachea → Alveoli
  • 9. What is the main function of white blood cells?
A) Transport nutrients
B) Carry oxygen
C) Defend against infection
D) Clot blood
  • 10. Which organ pumps blood throughout the body?
A) Heart
B) Lungs
C) Kidney
D) Brain
  • 11. Which lifestyle factor MOST increases the risk of lung cancer?
A) Sleeping early
B) Healthy diet
C) Exercise
D) Smoking
  • 12. What happens to the heart rate during regular exercise?
A) Decreases efficiency
B) Becomes more efficient
C) Increases permanently
D) Stays the same
  • 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) Sex-linked
B) Codominance
C) Incomplete dominance
D) Multiple alleles
  • 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) Codominance
B) Multiple alleles
C) Polygenic
D) Incomplete dominance
  • 17. Which alleles control human blood type?
A) T, t
B) X, Y
C) A, B, O
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) Down syndrome
B) Hemophilia
C) Klinefelter’s syndrome
D) Turner’s syndrome
  • 20. If a red cow and white cow produce a roan calf, the inheritance pattern is:
A) Incomplete dominance
B) Multiple alleles
C) Polygenic
D) Codominance
  • 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) Multiple alleles
B) Sex-linked
C) Codominance
D) Polygenic
  • 23. If a person has genotype IAi, his blood type is:
A) Type O
B) Type AB
C) Type A
D) Type OA
  • 24. What is the chronic respiratory condition that causes difficulty in breathing due
    to inflammation of the airways?
A) Pneumonia
B) Asthma
C) Bronchitis
D) Emphysema
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Excretory System
B) Digestive System
C) Nervous System
D) Circulatory system
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Diaphragm
B) Larynx
C) Epiglottis
D) Ribcage
  • 27. Which part of the respiratory system warms, moistens, and filters the air?
A) Alveoli
B) Nose
C) Bronchi
D) Trachea
  • 28. Lack of physical activity may lead to:
A) Obesity and hypertension
B) Better lung function
C) Stronger heart
D) Healthy arteries
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Incomplete dominance
B) Codominance
C) Polygenic inheritance
D) Multiple alleles
  • 30. Which blood type shows codominance of A and B alleles?
A) Type B
B) Type AB
C) Type A
D) Type O
  • 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) Sending signals
B) Breaking down food
C) Pumping blood
D) Exchanging gases
  • 33. The circulatory system is also known as the:
A) Lymphatic system
B) Skeletal system
C) Digestive system
D) Cardiovascular system
  • 34. Which blood vessel carries blood back to the heart?
A) Veins
B) Capillaries
C) Arteries
D) Bronchi
  • 35. Which part of the blood fights infection?
A) Plasma
B) Red blood cells
C) Platelets
D) White 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) Dust and smoke
B) Exercise
C) Drinking water
D) Fresh air
  • 38. Which situation demonstrates codominance?
A) Tall and short parents producing medium offspring
B) Brown-eyed and blue-eyed parents producing green-eyed children
C) A white flower and red flower produce pink flowers
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) 100%
B) 25%
C) 75%
D) 50%
  • 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 lungs collapse
C) Blood volume decreases
D) The body needs more oxygen
  • 42. Which best explains why multiple alleles traits vary widely in a population?
A) They skip generations
B) They involve many genes
C) They are sex-linked
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 black chicken and white chicken produce only black offspring
C) A tall and short plant produce a tall plant
D) A red cow and white cow produce a roan calf
  • 44. Why does the body increase breathing rate during exercise?
A) To prevent sweating
B) To increase bone growth
C) To store more oxygen in stomach
D) To release more carbon dioxide
  • 45. A farmer crossbreeds a red flower (RR) and white flower (WW). The offspring are all pink (RW). Which inheritance is this?
A) Codominance
B) Simple dominance
C) Polygenic inheritance
D) Incomplete dominance
  • 46. Which school activity BEST integrates knowledge of non-Mendelian inheritance?
A) Playing unrelated video games
B) Painting random pictures
C) Designing Punnett squares for codominance and incomplete dominance
D) Ignoring genetics in biology class
  • 47. A city wants to lower rates of respiratory disease. Which program is BEST?
A) Reduce air pollution and enforce anti-smoking laws
B) Encourage longer screen time for students
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 improves lung function
B) Poor diet may lead to obesity, heart disease, and diabetes
C) Poor diet has no effect if you are young
D) Poor diet only affects appearance, not health
  • 49. Which conclusion is most accurate about lifestyle diseases?
A) They cannot be prevented
B) They can be prevented by healthy habits
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) “Stay Awake All Night!”
C) “Eat Fast Food Now!”
D) “Ignore Your Health”
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