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1ST_QUARTER_MARCIANO_SCI9
Contributed by: Marciano
  • 1. The dome-shaped muscle responsible for breathing is called:
A) Valve
B) Diaphragm
C) Trachea
D) Bronchi
  • 2. Blood vessels that carry blood away from the heart are called:
A) Arteries
B) Capillaries
C) Veins
D) Venules
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Venules
B) Veins
C) Capillaries
D) Arteries
  • 4. The voice box is scientifically called:
A) Trachea
B) Alveoli
C) Larynx
D) Pharynx
  • 5. The respiratory system supplies oxygen and removes:
A) Carbon dioxide
B) Water
C) Nitrogen
D) Hydrogen
  • 6. The windpipe is also known as:
A) Bronchus
B) Trachea
C) Alveoli
D) Esophagus
  • 7. The fluid component of blood is:
A) Platelets
B) Hemoglobin
C) Oxygen
D) Plasma
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Pharynx → Esophagus → Alveoli
B) Nose → Trachea → Bronchi → Alveoli
C) Nose → Alveoli → Bronchi → Trachea
D) Nose → Bronchi → Trachea → Alveoli
  • 9. What is the main function of white blood cells?
A) Defend against infection
B) Transport nutrients
C) Carry oxygen
D) Clot blood
  • 10. Which organ pumps blood throughout the body?
A) Kidney
B) Lungs
C) Brain
D) Heart
  • 11. Which lifestyle factor MOST increases the risk of lung cancer?
A) Smoking
B) Exercise
C) Sleeping early
D) Healthy diet
  • 12. What happens to the heart rate during regular exercise?
A) Stays the same
B) Decreases efficiency
C) Increases permanently
D) Becomes more efficient
  • 13. Which factor lowers the risk of cardiovascular disease?
A) High-salt diet
B) Regular physical activity
C) Smoking
D) Sedentary lifestyle
  • 14. Which inheritance shows blending of traits?
A) Codominance
B) Sex-linked
C) Multiple alleles
D) Incomplete dominance
  • 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) Codominance
B) Multiple alleles
C) Polygenic
D) Incomplete dominance
  • 17. Which alleles control human blood type?
A) A, B, O
B) T, t
C) X, Y
D) H, h
  • 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) 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) Codominance
D) Incomplete dominance
  • 21. Which is NOT an example of non-Mendelian inheritance?
A) Codominance
B) Incomplete dominance
C) Simple dominance
  • 22. Which inheritance pattern involves genes located on sex chromosomes?
A) Polygenic
B) Codominance
C) Sex-linked
D) Multiple alleles
  • 23. If a person has genotype IAi, his blood type is:
A) Type AB
B) Type O
C) Type OA
D) Type A
  • 24. What is the chronic respiratory condition that causes difficulty in breathing due
    to inflammation of the airways?
A) Emphysema
B) Bronchitis
C) Asthma
D) Pneumonia
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Nervous System
B) Circulatory system
C) Excretory System
D) Digestive System
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Epiglottis
B) Ribcage
C) Diaphragm
D) Larynx
  • 27. Which part of the respiratory system warms, moistens, and filters the air?
A) Nose
B) Alveoli
C) Trachea
D) Bronchi
  • 28. Lack of physical activity may lead to:
A) Obesity and hypertension
B) Healthy arteries
C) Stronger heart
D) Better lung function
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Multiple alleles
B) Codominance
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) Chromosome 21
B) X and Y chromosomes
C) Hemoglobin pair
D) 1–22 autosomes
  • 32. The main function of the respiratory system is:
A) Pumping blood
B) Breaking down food
C) Sending signals
D) Exchanging gases
  • 33. The circulatory system is also known as the:
A) Cardiovascular system
B) Skeletal system
C) Digestive 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) Plasma
C) Red blood cells
D) Platelets
  • 36. A runner takes deep breaths after a sprint. Which system primarily helps restore balance?
A) Endocrine System
B) Nervous System
C) Circulatory System
D) Respiratory 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) 50%
B) 75%
C) 25%
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 lungs collapse
B) The nervous system shuts down
C) The body needs more oxygen
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 are sex-linked
D) They skip generations
  • 43. Which situation best shows incomplete dominance?
A) A tall and short plant produce a tall plant
B) A black chicken and white chicken produce only black offspring
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 increase bone growth
C) To store more oxygen in stomach
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) Codominance
C) Simple dominance
D) Polygenic inheritance
  • 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) Increase the price of healthy food
B) Encourage longer screen time for students
C) Build more gyms and promote fitness
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 has no effect if you are young
B) Poor diet may lead to obesity, heart disease, and diabetes
C) Poor diet improves lung function
D) Poor diet only affects appearance, not health
  • 49. Which conclusion is most accurate about lifestyle diseases?
A) They are caused only by pollution
B) They cannot be prevented
C) They are always inherited
D) They can be prevented by healthy habits
  • 50. A student is designing a campaign to prevent respiratory illnesses. Which slogan is most effective?
A) “Eat Fast Food Now!”
B) “Say No to Smoking, Say Yes to Breathing Free!”
C) “Stay Awake All Night!”
D) “Ignore Your Health”
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