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1ST_QUARTER_MARCIANO_SCI9
Contributed by: Marciano
  • 1. The dome-shaped muscle responsible for breathing is called:
A) Diaphragm
B) Trachea
C) Valve
D) Bronchi
  • 2. Blood vessels that carry blood away from the heart are called:
A) Arteries
B) Veins
C) Venules
D) Capillaries
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Capillaries
B) Veins
C) Venules
D) Arteries
  • 4. The voice box is scientifically called:
A) Alveoli
B) Pharynx
C) Larynx
D) Trachea
  • 5. The respiratory system supplies oxygen and removes:
A) Water
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
  • 6. The windpipe is also known as:
A) Alveoli
B) Esophagus
C) Bronchus
D) Trachea
  • 7. The fluid component of blood is:
A) Platelets
B) Hemoglobin
C) Plasma
D) Oxygen
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Alveoli → Bronchi → Trachea
B) Nose → Pharynx → Esophagus → Alveoli
C) Nose → Bronchi → Trachea → Alveoli
D) Nose → Trachea → Bronchi → Alveoli
  • 9. What is the main function of white blood cells?
A) Transport nutrients
B) Clot blood
C) Defend against infection
D) Carry oxygen
  • 10. Which organ pumps blood throughout the body?
A) Heart
B) Brain
C) Kidney
D) Lungs
  • 11. Which lifestyle factor MOST increases the risk of lung cancer?
A) Healthy diet
B) Smoking
C) Sleeping early
D) Exercise
  • 12. What happens to the heart rate during regular exercise?
A) Stays the same
B) Becomes more efficient
C) Decreases efficiency
D) Increases permanently
  • 13. Which factor lowers the risk of cardiovascular disease?
A) High-salt diet
B) Regular physical activity
C) Sedentary lifestyle
D) Smoking
  • 14. Which inheritance shows blending of traits?
A) Sex-linked
B) Codominance
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) Incomplete dominance
C) Polygenic
D) Multiple alleles
  • 17. Which alleles control human blood type?
A) T, t
B) H, h
C) A, B, O
D) X, Y
  • 18. Baldness in males is an example of:
A) Incomplete dominance
B) Polygenic
C) Sex-influenced trait
D) Codominance
  • 19. Which condition results from having an extra chromosome 21?
A) Turner’s syndrome
B) Klinefelter’s syndrome
C) Hemophilia
D) Down 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) Codominance
B) Polygenic
C) Multiple alleles
D) Sex-linked
  • 23. If a person has genotype IAi, his blood type is:
A) Type AB
B) Type O
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) Emphysema
D) Bronchitis
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Nervous System
B) Digestive System
C) Circulatory system
D) Excretory System
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Ribcage
B) Epiglottis
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) Better lung function
B) Healthy arteries
C) Obesity and hypertension
D) Stronger heart
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Incomplete dominance
B) Multiple alleles
C) Codominance
D) Polygenic inheritance
  • 30. Which blood type shows codominance of A and B alleles?
A) Type A
B) Type O
C) Type AB
D) Type B
  • 31. Which chromosome pair determines the sex of humans?
A) Hemoglobin pair
B) 1–22 autosomes
C) Chromosome 21
D) X and Y chromosomes
  • 32. The main function of the respiratory system is:
A) Exchanging gases
B) Sending signals
C) Pumping blood
D) Breaking down food
  • 33. The circulatory system is also known as the:
A) Skeletal system
B) Digestive system
C) Cardiovascular system
D) Lymphatic 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) 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) Respiratory system
B) Circulatory System
C) Nervous System
D) Endocrine System
  • 37. A person with asthma attacks should avoid:
A) Fresh air
B) Dust and smoke
C) Exercise
D) Drinking water
  • 38. Which situation demonstrates codominance?
A) Brown-eyed and blue-eyed parents producing green-eyed children
B) A black chicken and white chicken produce speckled offspring
C) A white flower and red flower produce pink flowers
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) 25%
B) 100%
C) 50%
D) 75%
  • 40. Which lifestyle change will most improve circulatory health?
A) Increase salt intake
B) Quit smoking
C) Eat processed foods
D) Avoid fruits
  • 41. A student notes that his pulse rate increases after jogging. What explains this?
A) Blood volume decreases
B) The body needs more oxygen
C) The nervous system shuts down
D) The lungs collapse
  • 42. Which best explains why multiple alleles traits vary widely in a population?
A) They are sex-linked
B) They are caused by environment alone
C) They skip generations
D) They involve many genes
  • 43. Which situation best shows incomplete dominance?
A) A tall and short plant produce a tall plant
B) A red flower and white flower produce pink offspring
C) A red cow and white cow produce a roan calf
D) A black chicken and white chicken produce only black offspring
  • 44. Why does the body increase breathing rate during exercise?
A) To increase bone growth
B) To release more carbon dioxide
C) To prevent sweating
D) To store more oxygen in stomach
  • 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) Incomplete dominance
C) Codominance
D) Simple dominance
  • 46. Which school activity BEST integrates knowledge of non-Mendelian inheritance?
A) Ignoring genetics in biology class
B) Designing Punnett squares for codominance and incomplete dominance
C) Painting random pictures
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 only affects appearance, not health
B) Poor diet has no effect if you are young
C) Poor diet may lead to obesity, heart disease, and diabetes
D) Poor diet improves lung function
  • 49. Which conclusion is most accurate about lifestyle diseases?
A) They are always inherited
B) They are caused only by pollution
C) They cannot be prevented
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) “Say No to Smoking, Say Yes to Breathing Free!”
B) “Eat Fast Food Now!”
C) “Ignore Your Health”
D) “Stay Awake All Night!”
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